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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /gfx/thebes/COLRFonts.cpp
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'gfx/thebes/COLRFonts.cpp')
-rw-r--r--gfx/thebes/COLRFonts.cpp2673
1 files changed, 2673 insertions, 0 deletions
diff --git a/gfx/thebes/COLRFonts.cpp b/gfx/thebes/COLRFonts.cpp
new file mode 100644
index 0000000000..6369bf191d
--- /dev/null
+++ b/gfx/thebes/COLRFonts.cpp
@@ -0,0 +1,2673 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "COLRFonts.h"
+#include "gfxFontUtils.h"
+#include "gfxUtils.h"
+#include "harfbuzz/hb.h"
+#include "harfbuzz/hb-ot.h"
+#include "mozilla/gfx/Helpers.h"
+#include "mozilla/ScopeExit.h"
+#include "mozilla/StaticPrefs_gfx.h"
+#include "TextDrawTarget.h"
+
+#include <limits>
+
+using namespace mozilla;
+using namespace mozilla::gfx;
+
+namespace { // anonymous namespace for implementation internals
+
+#pragma pack(1) // ensure no padding is added to the COLR structs
+
+// Alias bigendian-reading types from gfxFontUtils to names used in the spec.
+using int16 = AutoSwap_PRInt16;
+using uint16 = AutoSwap_PRUint16;
+using int32 = AutoSwap_PRInt32;
+using uint32 = AutoSwap_PRUint32;
+using FWORD = AutoSwap_PRInt16;
+using UFWORD = AutoSwap_PRUint16;
+using Offset16 = AutoSwap_PRUint16;
+using Offset24 = AutoSwap_PRUint24;
+using Offset32 = AutoSwap_PRUint32;
+
+struct COLRv1Header;
+struct ClipList;
+struct LayerRecord;
+struct BaseGlyphRecord;
+struct DeltaSetIndexMap;
+struct ItemVariationStore;
+
+struct COLRHeader {
+ uint16 version;
+ uint16 numBaseGlyphRecords;
+ Offset32 baseGlyphRecordsOffset;
+ Offset32 layerRecordsOffset;
+ uint16 numLayerRecords;
+
+ const BaseGlyphRecord* GetBaseGlyphRecords() const {
+ return reinterpret_cast<const BaseGlyphRecord*>(
+ reinterpret_cast<const char*>(this) + baseGlyphRecordsOffset);
+ }
+
+ const LayerRecord* GetLayerRecords() const {
+ return reinterpret_cast<const LayerRecord*>(
+ reinterpret_cast<const char*>(this) + layerRecordsOffset);
+ }
+
+ bool Validate(uint64_t aLength) const;
+};
+
+struct BaseGlyphPaintRecord {
+ uint16 glyphID;
+ Offset32 paintOffset;
+};
+
+struct BaseGlyphList {
+ uint32 numBaseGlyphPaintRecords;
+ // BaseGlyphPaintRecord baseGlyphPaintRecords[numBaseGlyphPaintRecords];
+ const BaseGlyphPaintRecord* baseGlyphPaintRecords() const {
+ return reinterpret_cast<const BaseGlyphPaintRecord*>(this + 1);
+ }
+ bool Validate(const COLRv1Header* aHeader, uint64_t aLength) const;
+};
+
+struct LayerList {
+ uint32 numLayers;
+ // uint32 paintOffsets[numLayers];
+ const uint32* paintOffsets() const {
+ return reinterpret_cast<const uint32*>(this + 1);
+ }
+ bool Validate(const COLRv1Header* aHeader, uint64_t aLength) const;
+};
+
+struct COLRv1Header {
+ COLRHeader base;
+ Offset32 baseGlyphListOffset;
+ Offset32 layerListOffset;
+ Offset32 clipListOffset;
+ Offset32 varIndexMapOffset;
+ Offset32 itemVariationStoreOffset;
+
+ bool Validate(uint64_t aLength) const;
+
+ const BaseGlyphList* baseGlyphList() const {
+ uint32_t offset = baseGlyphListOffset;
+ if (!offset) {
+ return nullptr;
+ }
+ const char* ptr = reinterpret_cast<const char*>(this) + offset;
+ return reinterpret_cast<const struct BaseGlyphList*>(ptr);
+ }
+
+ const LayerList* layerList() const {
+ uint32_t offset = layerListOffset;
+ if (!offset) {
+ return nullptr;
+ }
+ const char* ptr = reinterpret_cast<const char*>(this) + offset;
+ return reinterpret_cast<const LayerList*>(ptr);
+ }
+
+ const struct ClipList* clipList() const {
+ uint32_t offset = clipListOffset;
+ if (!offset) {
+ return nullptr;
+ }
+ const char* ptr = reinterpret_cast<const char*>(this) + offset;
+ return reinterpret_cast<const ClipList*>(ptr);
+ }
+
+ const struct DeltaSetIndexMap* varIndexMap() const {
+ uint32_t offset = varIndexMapOffset;
+ if (!offset) {
+ return nullptr;
+ }
+ const char* ptr = reinterpret_cast<const char*>(this) + offset;
+ return reinterpret_cast<const DeltaSetIndexMap*>(ptr);
+ }
+
+ const struct ItemVariationStore* itemVariationStore() const {
+ uint32_t offset = itemVariationStoreOffset;
+ if (!offset) {
+ return nullptr;
+ }
+ const char* ptr = reinterpret_cast<const char*>(this) + offset;
+ return reinterpret_cast<const ItemVariationStore*>(ptr);
+ }
+
+ const BaseGlyphPaintRecord* GetBaseGlyphPaint(uint32_t aGlyphId) const;
+};
+
+struct PaintState {
+ union {
+ const COLRHeader* v0;
+ const COLRv1Header* v1;
+ } mHeader;
+ const sRGBColor* mPalette;
+ DrawTarget* mDrawTarget;
+ ScaledFont* mScaledFont;
+ const int* mCoords;
+ DrawOptions mDrawOptions;
+ uint32_t mCOLRLength;
+ sRGBColor mCurrentColor;
+ float mFontUnitsToPixels;
+ uint16_t mNumColors;
+ uint16_t mCoordCount;
+ nsTArray<uint32_t>* mVisited;
+
+ const char* COLRv1BaseAddr() const {
+ return reinterpret_cast<const char*>(mHeader.v1);
+ }
+
+ DeviceColor GetColor(uint16_t aPaletteIndex, float aAlpha) const;
+
+ // Convert from FUnits (either integer or Fixed 16.16) to device pixels.
+ template <typename T>
+ float F2P(T aPixels) const {
+ return mFontUnitsToPixels * float(aPixels);
+ }
+};
+
+DeviceColor PaintState::GetColor(uint16_t aPaletteIndex, float aAlpha) const {
+ sRGBColor color;
+ if (aPaletteIndex < mNumColors) {
+ color = mPalette[uint16_t(aPaletteIndex)];
+ } else if (aPaletteIndex == 0xffff) {
+ color = mCurrentColor;
+ } else { // Palette index out of range! Return transparent black.
+ color = sRGBColor();
+ }
+ color.a *= aAlpha;
+ return ToDeviceColor(color);
+}
+
+static bool DispatchPaint(const PaintState& aState, uint32_t aOffset,
+ const Rect* aBounds /* may be nullptr if unknown */);
+static UniquePtr<Pattern> DispatchMakePattern(const PaintState& aState,
+ uint32_t aOffset);
+static Rect DispatchGetBounds(const PaintState& aState, uint32_t aOffset);
+static Matrix DispatchGetMatrix(const PaintState& aState, uint32_t aOffset);
+
+// Variation-data types
+struct Fixed {
+ enum { kFractionBits = 16 };
+ operator float() const {
+ return float(int32_t(value)) / float(1 << kFractionBits);
+ }
+ int32_t intRepr() const { return int32_t(value); }
+
+ private:
+ int32 value;
+};
+
+struct F2DOT14 {
+ enum { kFractionBits = 14 };
+ operator float() const {
+ return float(int16_t(value)) / float(1 << kFractionBits);
+ }
+ int32_t intRepr() const { return int16_t(value); }
+
+ private:
+ int16 value;
+};
+
+// Saturating addition used for variation indexes to avoid wrap-around.
+static uint32_t SatAdd(uint32_t a, uint32_t b) {
+ if (a <= std::numeric_limits<uint32_t>::max() - b) {
+ return a + b;
+ }
+ return std::numeric_limits<uint32_t>::max();
+}
+
+struct RegionAxisCoordinates {
+ F2DOT14 startCoord;
+ F2DOT14 peakCoord;
+ F2DOT14 endCoord;
+};
+
+struct VariationRegion {
+ // RegionAxisCoordinates regionAxes[axisCount];
+ const RegionAxisCoordinates* regionAxes() const {
+ return reinterpret_cast<const RegionAxisCoordinates*>(this);
+ }
+};
+
+struct VariationRegionList {
+ uint16 axisCount;
+ uint16 regionCount;
+ // VariationRegion variationRegions[regionCount];
+ const char* variationRegionsBase() const {
+ return reinterpret_cast<const char*>(this + 1);
+ }
+ size_t regionSize() const {
+ return uint16_t(axisCount) * sizeof(RegionAxisCoordinates);
+ }
+ const VariationRegion* getRegion(uint16_t i) const {
+ if (i >= uint16_t(regionCount)) {
+ return nullptr;
+ }
+ return reinterpret_cast<const VariationRegion*>(variationRegionsBase() +
+ i * regionSize());
+ }
+ bool Validate(const COLRv1Header* aHeader, uint64_t aLength) const {
+ if (variationRegionsBase() - reinterpret_cast<const char*>(aHeader) +
+ uint16_t(regionCount) * regionSize() >
+ aLength) {
+ return false;
+ }
+ return true;
+ }
+};
+
+struct DeltaSet {
+ // (int16 and int8)
+ // *or*
+ // (int32 and int16) deltaData[regionIndexCount];
+};
+
+struct DeltaSetIndexMap {
+ enum { INNER_INDEX_BIT_COUNT_MASK = 0x0f, MAP_ENTRY_SIZE_MASK = 0x30 };
+ uint8_t format;
+ uint8_t entryFormat;
+ union {
+ struct {
+ uint16 mapCount;
+ // uint8 mapData[variable];
+ } v0;
+ struct {
+ uint32 mapCount;
+ // uint8 mapData[variable];
+ } v1;
+ };
+ uint32_t entrySize() const {
+ return (((entryFormat & MAP_ENTRY_SIZE_MASK) >> 4) + 1);
+ }
+ uint32_t map(uint32_t aIndex) const {
+ uint32_t mapCount;
+ const uint8_t* mapData;
+ switch (format) {
+ case 0:
+ mapCount = uint32_t(v0.mapCount);
+ mapData = reinterpret_cast<const uint8_t*>(&v0.mapCount) +
+ sizeof(v0.mapCount);
+ break;
+ case 1:
+ mapCount = uint32_t(v1.mapCount);
+ mapData = reinterpret_cast<const uint8_t*>(&v1.mapCount) +
+ sizeof(v1.mapCount);
+ break;
+ default:
+ // unknown DeltaSetIndexMap format
+ return aIndex;
+ }
+ if (!mapCount) {
+ return aIndex;
+ }
+ if (aIndex >= mapCount) {
+ aIndex = mapCount - 1;
+ }
+ const uint8_t* entryData = mapData + aIndex * entrySize();
+ uint32_t entry = 0;
+ for (uint32_t i = 0; i < entrySize(); ++i) {
+ entry = (entry << 8) + entryData[i];
+ }
+ uint16_t outerIndex =
+ entry >> ((entryFormat & INNER_INDEX_BIT_COUNT_MASK) + 1);
+ uint16_t innerIndex =
+ entry & ((1 << ((entryFormat & INNER_INDEX_BIT_COUNT_MASK) + 1)) - 1);
+ return (uint32_t(outerIndex) << 16) + innerIndex;
+ }
+ bool Validate(const COLRv1Header* aHeader, uint64_t aLength) const;
+};
+
+enum EntryFormatMasks {
+ INNER_INDEX_BIT_COUNT_MASK = 0x0f,
+ MAP_ENTRY_SIZE_MASK = 0x30
+};
+
+struct ItemVariationData {
+ enum { WORD_DELTA_COUNT_MASK = 0x7FFF, LONG_WORDS = 0x8000 };
+ uint16 itemCount;
+ uint16 wordDeltaCount;
+ uint16 regionIndexCount;
+ // uint16 regionIndexes[regionIndexCount];
+ const uint16* regionIndexes() const {
+ return reinterpret_cast<const uint16*>(
+ reinterpret_cast<const char*>(this + 1));
+ }
+ // DeltaSet deltaSets[itemCount];
+ const DeltaSet* deltaSets() const {
+ return reinterpret_cast<const DeltaSet*>(
+ reinterpret_cast<const char*>(this + 1) +
+ uint16_t(regionIndexCount) * sizeof(uint16));
+ }
+ bool Validate(const COLRv1Header* aHeader, uint64_t aLength) const;
+};
+
+struct ItemVariationStore {
+ uint16 format;
+ Offset32 variationRegionListOffset;
+ uint16 itemVariationDataCount;
+ // Offset32 itemVariationDataOffsets[itemVariationDataCount];
+ const Offset32* itemVariationDataOffsets() const {
+ return reinterpret_cast<const Offset32*>(
+ reinterpret_cast<const char*>(this + 1));
+ }
+ const VariationRegionList* variationRegionList() const {
+ return reinterpret_cast<const VariationRegionList*>(
+ reinterpret_cast<const char*>(this) + variationRegionListOffset);
+ }
+ bool Validate(const COLRv1Header* aHeader, uint64_t aLength) const;
+};
+
+static int32_t ApplyVariation(const PaintState& aState, int32_t aValue,
+ uint32_t aIndex) {
+ if (aIndex == 0xffffffff) {
+ return aValue;
+ }
+ const auto* store = aState.mHeader.v1->itemVariationStore();
+ if (!store || uint16_t(store->format) != 1) {
+ return aValue;
+ }
+ const DeltaSetIndexMap* map = aState.mHeader.v1->varIndexMap();
+ uint32_t mappedIndex = map ? map->map(aIndex) : aIndex;
+ uint16_t outerIndex = mappedIndex >> 16;
+ uint16_t innerIndex = mappedIndex & 0xffff;
+ const auto* itemVariationDataOffsets = store->itemVariationDataOffsets();
+ if (mappedIndex == 0xffffffff ||
+ outerIndex >= uint16_t(store->itemVariationDataCount) ||
+ !itemVariationDataOffsets[outerIndex]) {
+ return aValue;
+ }
+ const auto* regionList = store->variationRegionList();
+ if (outerIndex >= uint16_t(store->itemVariationDataCount)) {
+ return aValue;
+ }
+ const auto* variationData = reinterpret_cast<const ItemVariationData*>(
+ reinterpret_cast<const char*>(store) +
+ itemVariationDataOffsets[outerIndex]);
+ if (innerIndex >= uint16_t(variationData->itemCount)) {
+ return aValue;
+ }
+ const auto* regionIndexes = variationData->regionIndexes();
+ uint16_t regionIndexCount = variationData->regionIndexCount;
+ const DeltaSet* deltaSets = variationData->deltaSets();
+ uint16_t wordDeltaCount = variationData->wordDeltaCount;
+ bool longWords = wordDeltaCount & ItemVariationData::LONG_WORDS;
+ wordDeltaCount &= ItemVariationData::WORD_DELTA_COUNT_MASK;
+ uint32_t deltaSetSize = (regionIndexCount + wordDeltaCount) << longWords;
+ const uint8_t* deltaData =
+ reinterpret_cast<const uint8_t*>(deltaSets) + deltaSetSize * innerIndex;
+ uint16_t deltaSize = longWords ? 4 : 2;
+ int32_t result = aValue;
+ for (uint16_t i = 0; i < regionIndexCount; ++i, deltaData += deltaSize) {
+ if (i == wordDeltaCount) {
+ deltaSize >>= 1;
+ }
+ const auto* region = regionList->getRegion(uint16_t(regionIndexes[i]));
+ if (!region) {
+ return aValue;
+ }
+ // XXX Should we do the calculations here in fixed-point? Check spec.
+ float scalar = -1.0;
+ for (uint16_t axisIndex = 0; axisIndex < uint16_t(regionList->axisCount);
+ ++axisIndex) {
+ const auto& axis = region->regionAxes()[axisIndex];
+ float peak = axis.peakCoord;
+ if (peak == 0.0) {
+ // This axis cannot contribute to scalar.
+ continue;
+ }
+ float start = axis.startCoord;
+ float end = axis.endCoord;
+ float value = axisIndex < aState.mCoordCount
+ ? float(aState.mCoords[axisIndex]) / 16384.0f
+ : 0.0;
+ if (value < start || value > end) {
+ // Out of range: this region is not applicable.
+ scalar = -1.0;
+ break;
+ }
+ if (scalar < 0.0) {
+ scalar = 1.0;
+ }
+ if (value == peak) {
+ continue;
+ }
+ if (value < peak && peak > start) {
+ scalar *= (value - start) / (peak - start);
+ } else if (value > peak && peak < end) {
+ scalar *= (end - value) / (end - peak);
+ }
+ }
+ if (scalar <= 0.0) {
+ continue;
+ }
+ int32_t delta = *reinterpret_cast<const int8_t*>(deltaData); // sign-extend
+ for (uint16_t j = 1; j < deltaSize; ++j) {
+ delta = (delta << 8) | deltaData[j];
+ }
+ delta = int32_t(floorf((float(delta) * scalar) + 0.5f));
+ result += delta;
+ }
+ return result;
+};
+
+static float ApplyVariation(const PaintState& aState, Fixed aValue,
+ uint32_t aIndex) {
+ return float(ApplyVariation(aState, aValue.intRepr(), aIndex)) /
+ (1 << Fixed::kFractionBits);
+}
+
+static float ApplyVariation(const PaintState& aState, F2DOT14 aValue,
+ uint32_t aIndex) {
+ return float(ApplyVariation(aState, aValue.intRepr(), aIndex)) /
+ (1 << F2DOT14::kFractionBits);
+}
+
+struct ClipBoxFormat1 {
+ enum { kFormat = 1 };
+ uint8_t format;
+ FWORD xMin;
+ FWORD yMin;
+ FWORD xMax;
+ FWORD yMax;
+
+ Rect GetRect(const PaintState& aState) const {
+ MOZ_ASSERT(format == kFormat);
+ int32_t x0 = int16_t(xMin);
+ int32_t y0 = int16_t(yMin);
+ int32_t x1 = int16_t(xMax);
+ int32_t y1 = int16_t(yMax);
+ // Flip the y-coordinates to map from OpenType to Moz2d space.
+ return Rect(aState.F2P(x0), -aState.F2P(y1), aState.F2P(x1 - x0),
+ aState.F2P(y1 - y0));
+ }
+};
+
+struct ClipBoxFormat2 : public ClipBoxFormat1 {
+ enum { kFormat = 2 };
+ uint32 varIndexBase;
+
+ Rect GetRect(const PaintState& aState) const {
+ MOZ_ASSERT(format == kFormat);
+ int32_t x0 = ApplyVariation(aState, int16_t(xMin), varIndexBase);
+ int32_t y0 = ApplyVariation(aState, int16_t(yMin), SatAdd(varIndexBase, 1));
+ int32_t x1 = ApplyVariation(aState, int16_t(xMax), SatAdd(varIndexBase, 2));
+ int32_t y1 = ApplyVariation(aState, int16_t(yMax), SatAdd(varIndexBase, 3));
+ return Rect(aState.F2P(x0), -aState.F2P(y1), aState.F2P(x1 - x0),
+ aState.F2P(y1 - y0));
+ }
+};
+
+struct Clip {
+ uint16 startGlyphID;
+ uint16 endGlyphID;
+ Offset24 clipBoxOffset;
+
+ Rect GetRect(const PaintState& aState) const {
+ uint32_t offset = aState.mHeader.v1->clipListOffset + clipBoxOffset;
+ const auto* box = aState.COLRv1BaseAddr() + offset;
+ switch (*box) {
+ case 1:
+ return reinterpret_cast<const ClipBoxFormat1*>(box)->GetRect(aState);
+ case 2:
+ return reinterpret_cast<const ClipBoxFormat2*>(box)->GetRect(aState);
+ default:
+ // unknown ClipBoxFormat
+ break;
+ }
+ return Rect();
+ }
+ bool Validate(const COLRv1Header* aHeader, uint64_t aLength) const;
+};
+
+struct ClipList {
+ uint8_t format;
+ uint32 numClips;
+ // Clip clips[numClips]
+ const Clip* clips() const { return reinterpret_cast<const Clip*>(this + 1); }
+ const Clip* GetClip(uint32_t aGlyphId) const {
+ auto compare = [](const void* key, const void* data) -> int {
+ uint32_t glyphId = (uint32_t)(uintptr_t)key;
+ const auto* clip = reinterpret_cast<const Clip*>(data);
+ uint32_t start = uint16_t(clip->startGlyphID);
+ uint32_t end = uint16_t(clip->endGlyphID);
+ if (start <= glyphId && end >= glyphId) {
+ return 0;
+ }
+ return start > glyphId ? -1 : 1;
+ };
+ return reinterpret_cast<const Clip*>(bsearch((void*)(uintptr_t)aGlyphId,
+ clips(), uint32_t(numClips),
+ sizeof(Clip), compare));
+ }
+ bool Validate(const COLRv1Header* aHeader, uint64_t aLength) const;
+};
+
+struct LayerRecord {
+ uint16 glyphId;
+ uint16 paletteEntryIndex;
+
+ bool Paint(const PaintState& aState, float aAlpha,
+ const Point& aPoint) const {
+ Glyph glyph{uint16_t(glyphId), aPoint};
+ GlyphBuffer buffer{&glyph, 1};
+ aState.mDrawTarget->FillGlyphs(
+ aState.mScaledFont, buffer,
+ ColorPattern(aState.GetColor(paletteEntryIndex, aAlpha)),
+ aState.mDrawOptions);
+ return true;
+ }
+};
+
+struct BaseGlyphRecord {
+ uint16 glyphId;
+ uint16 firstLayerIndex;
+ uint16 numLayers;
+
+ bool Paint(const PaintState& aState, float aAlpha,
+ const Point& aPoint) const {
+ uint32_t layerIndex = uint16_t(firstLayerIndex);
+ uint32_t end = layerIndex + uint16_t(numLayers);
+ if (end > uint16_t(aState.mHeader.v0->numLayerRecords)) {
+ MOZ_ASSERT_UNREACHABLE("bad COLRv0 table");
+ return false;
+ }
+ const auto* layers = aState.mHeader.v0->GetLayerRecords();
+ while (layerIndex < end) {
+ if (!layers[layerIndex].Paint(aState, aAlpha, aPoint)) {
+ return false;
+ }
+ ++layerIndex;
+ }
+ return true;
+ }
+};
+
+struct ColorStop {
+ F2DOT14 stopOffset;
+ uint16 paletteIndex;
+ F2DOT14 alpha;
+
+ float GetStopOffset(const PaintState& aState) const { return stopOffset; }
+ uint16_t GetPaletteIndex() const { return paletteIndex; }
+ float GetAlpha(const PaintState& aState) const { return alpha; }
+};
+
+struct VarColorStop : public ColorStop {
+ uint32 varIndexBase;
+
+ float GetStopOffset(const PaintState& aState) const {
+ return ApplyVariation(aState, stopOffset, varIndexBase);
+ }
+ float GetAlpha(const PaintState& aState) const {
+ return ApplyVariation(aState, alpha, SatAdd(varIndexBase, 1));
+ }
+};
+
+template <typename T>
+struct ColorLineT {
+ enum { EXTEND_PAD = 0, EXTEND_REPEAT = 1, EXTEND_REFLECT = 2 };
+ uint8_t extend;
+ uint16 numStops;
+ const T* colorStops() const { return reinterpret_cast<const T*>(this + 1); }
+
+ // If the color line has only one stop, return it as a simple ColorPattern.
+ UniquePtr<Pattern> AsSolidColor(const PaintState& aState) const {
+ if (uint16_t(numStops) != 1) {
+ return nullptr;
+ }
+ const auto* stop = colorStops();
+ return MakeUnique<ColorPattern>(
+ aState.GetColor(stop->GetPaletteIndex(), stop->GetAlpha(aState)));
+ }
+
+ // Retrieve the color stops into an array of GradientStop records. The stops
+ // are normalized to the range [0 .. 1], and the original offsets of the
+ // first and last stops are returned.
+ // If aReverse is true, the color line is reversed.
+ void CollectGradientStops(const PaintState& aState,
+ nsTArray<GradientStop>& aStops, float* aFirstStop,
+ float* aLastStop, bool aReverse = false) const {
+ MOZ_ASSERT(aStops.IsEmpty());
+ uint16_t count = numStops;
+ if (!count) {
+ return;
+ }
+ const auto* stop = colorStops();
+ if (reinterpret_cast<const char*>(stop) + count * sizeof(T) >
+ aState.COLRv1BaseAddr() + aState.mCOLRLength) {
+ return;
+ }
+ aStops.SetCapacity(count);
+ for (uint16_t i = 0; i < count; ++i, ++stop) {
+ DeviceColor color =
+ aState.GetColor(stop->GetPaletteIndex(), stop->GetAlpha(aState));
+ aStops.AppendElement(GradientStop{stop->GetStopOffset(aState), color});
+ }
+ if (count == 1) {
+ *aFirstStop = *aLastStop = aStops[0].offset;
+ return;
+ }
+ aStops.StableSort();
+ if (aReverse) {
+ float a = aStops[0].offset;
+ float b = aStops.LastElement().offset;
+ aStops.Reverse();
+ for (auto& gs : aStops) {
+ gs.offset = a + b - gs.offset;
+ }
+ }
+ // Normalize stops to the range 0.0 .. 1.0, and return the original
+ // start & end.
+ // Note that if all stops are at the same offset, no normalization
+ // will be done.
+ *aFirstStop = aStops[0].offset;
+ *aLastStop = aStops.LastElement().offset;
+ if ((*aLastStop > *aFirstStop) &&
+ (*aLastStop != 1.0f || *aFirstStop != 0.0f)) {
+ float f = 1.0f / (*aLastStop - *aFirstStop);
+ for (auto& gs : aStops) {
+ gs.offset = (gs.offset - *aFirstStop) * f;
+ }
+ }
+ }
+
+ // Create a gfx::GradientStops representing the given color line stops,
+ // applying our extend mode.
+ already_AddRefed<GradientStops> MakeGradientStops(
+ const PaintState& aState, nsTArray<GradientStop>& aStops) const {
+ auto mapExtendMode = [](uint8_t aExtend) -> ExtendMode {
+ switch (aExtend) {
+ case EXTEND_REPEAT:
+ return ExtendMode::REPEAT;
+ case EXTEND_REFLECT:
+ return ExtendMode::REFLECT;
+ case EXTEND_PAD:
+ default:
+ return ExtendMode::CLAMP;
+ }
+ };
+ return aState.mDrawTarget->CreateGradientStops(
+ aStops.Elements(), aStops.Length(), mapExtendMode(extend));
+ }
+
+ already_AddRefed<GradientStops> MakeGradientStops(
+ const PaintState& aState, float* aFirstStop, float* aLastStop,
+ bool aReverse = false) const {
+ AutoTArray<GradientStop, 8> stops;
+ CollectGradientStops(aState, stops, aFirstStop, aLastStop, aReverse);
+ if (stops.IsEmpty()) {
+ return nullptr;
+ }
+ return MakeGradientStops(aState, stops);
+ }
+};
+
+using ColorLine = ColorLineT<ColorStop>;
+using VarColorLine = ColorLineT<VarColorStop>;
+
+// Used to check for cycles in the paint graph, and bail out to avoid infinite
+// recursion when traversing the graph in Paint() or GetBoundingRect(). (Only
+// PaintColrLayers and PaintColrGlyph can cause cycles; all other paint types
+// have only forward references within the table.)
+#define IF_CYCLE_RETURN(retval) \
+ if (aState.mVisited->Contains(aOffset)) { \
+ return retval; \
+ } \
+ aState.mVisited->AppendElement(aOffset); \
+ ScopeExit e([aState]() { aState.mVisited->RemoveLastElement(); })
+
+struct PaintColrLayers {
+ enum { kFormat = 1 };
+ uint8_t format;
+ uint8_t numLayers;
+ uint32 firstLayerIndex;
+
+ bool Paint(const PaintState& aState, uint32_t aOffset,
+ const Rect* aBounds) const {
+ MOZ_ASSERT(format == kFormat);
+ IF_CYCLE_RETURN(true);
+ const auto* layerList = aState.mHeader.v1->layerList();
+ if (!layerList) {
+ return false;
+ }
+ if (uint64_t(firstLayerIndex) + numLayers > layerList->numLayers) {
+ return false;
+ }
+ const auto* paintOffsets = layerList->paintOffsets() + firstLayerIndex;
+ for (uint32_t i = 0; i < numLayers; i++) {
+ if (!DispatchPaint(aState,
+ aState.mHeader.v1->layerListOffset + paintOffsets[i],
+ aBounds)) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ Rect GetBoundingRect(const PaintState& aState, uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ IF_CYCLE_RETURN(Rect());
+ const auto* layerList = aState.mHeader.v1->layerList();
+ if (!layerList) {
+ return Rect();
+ }
+ if (uint64_t(firstLayerIndex) + numLayers > layerList->numLayers) {
+ return Rect();
+ }
+ Rect result;
+ const auto* paintOffsets = layerList->paintOffsets() + firstLayerIndex;
+ for (uint32_t i = 0; i < numLayers; i++) {
+ result = result.Union(DispatchGetBounds(
+ aState, aState.mHeader.v1->layerListOffset + paintOffsets[i]));
+ }
+ return result;
+ }
+};
+
+struct PaintPatternBase {
+ bool Paint(const PaintState& aState, uint32_t aOffset,
+ const Rect* aBounds) const {
+ Matrix m = aState.mDrawTarget->GetTransform();
+ if (m.Invert()) {
+ if (auto pattern = DispatchMakePattern(aState, aOffset)) {
+ aState.mDrawTarget->FillRect(
+ m.TransformBounds(IntRectToRect(aState.mDrawTarget->GetRect())),
+ *pattern, aState.mDrawOptions);
+ return true;
+ }
+ }
+ return false;
+ }
+
+ Rect GetBoundingRect(const PaintState& aState, uint32_t aOffset) const {
+ return Rect();
+ }
+};
+
+struct PaintSolid : public PaintPatternBase {
+ enum { kFormat = 2 };
+ uint8_t format;
+ uint16 paletteIndex;
+ F2DOT14 alpha;
+
+ UniquePtr<Pattern> MakePattern(const PaintState& aState,
+ uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ return MakeUnique<ColorPattern>(aState.GetColor(paletteIndex, alpha));
+ }
+};
+
+struct PaintVarSolid : public PaintSolid {
+ enum { kFormat = 3 };
+ uint32 varIndexBase;
+
+ UniquePtr<Pattern> MakePattern(const PaintState& aState,
+ uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ return MakeUnique<ColorPattern>(aState.GetColor(
+ paletteIndex, ApplyVariation(aState, alpha, varIndexBase)));
+ }
+};
+
+struct PaintLinearGradient : public PaintPatternBase {
+ enum { kFormat = 4 };
+ uint8_t format;
+ Offset24 colorLineOffset;
+ FWORD x0;
+ FWORD y0;
+ FWORD x1;
+ FWORD y1;
+ FWORD x2;
+ FWORD y2;
+
+ UniquePtr<Pattern> MakePattern(const PaintState& aState,
+ uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ uint32_t clOffset = aOffset + colorLineOffset;
+ if (clOffset + sizeof(ColorLine) + sizeof(ColorStop) > aState.mCOLRLength) {
+ return nullptr;
+ }
+ const auto* colorLine =
+ reinterpret_cast<const ColorLine*>(aState.COLRv1BaseAddr() + clOffset);
+ Point p0(aState.F2P(int16_t(x0)), aState.F2P(int16_t(y0)));
+ Point p1(aState.F2P(int16_t(x1)), aState.F2P(int16_t(y1)));
+ Point p2(aState.F2P(int16_t(x2)), aState.F2P(int16_t(y2)));
+ return NormalizeAndMakeGradient(aState, colorLine, p0, p1, p2);
+ }
+
+ template <typename T>
+ UniquePtr<Pattern> NormalizeAndMakeGradient(const PaintState& aState,
+ const T* aColorLine, Point p0,
+ Point p1, Point p2) const {
+ // Ill-formed gradient should not be rendered.
+ if (p1 == p0 || p2 == p0) {
+ return MakeUnique<ColorPattern>(DeviceColor());
+ }
+ UniquePtr<Pattern> solidColor = aColorLine->AsSolidColor(aState);
+ if (solidColor) {
+ return solidColor;
+ }
+ float firstStop, lastStop;
+ AutoTArray<GradientStop, 8> stopArray;
+ aColorLine->CollectGradientStops(aState, stopArray, &firstStop, &lastStop);
+ if (stopArray.IsEmpty()) {
+ return MakeUnique<ColorPattern>(DeviceColor());
+ }
+ if (firstStop != 0.0 || lastStop != 1.0) {
+ if (firstStop == lastStop) {
+ if (aColorLine->extend != T::EXTEND_PAD) {
+ return MakeUnique<ColorPattern>(DeviceColor());
+ }
+ // For extend-pad, when the color line is zero-length, we add a "fake"
+ // color stop to create a [0.0..1.0]-normalized color line, so that the
+ // projection of points below works as expected.
+ for (auto& gs : stopArray) {
+ gs.offset = 0.0f;
+ }
+ stopArray.AppendElement(
+ GradientStop{1.0f, stopArray.LastElement().color});
+ lastStop += 1.0f;
+ }
+ // Adjust positions of the points to account for normalization of the
+ // color line stop offsets.
+ Point v = p1 - p0;
+ p0 += v * firstStop;
+ p1 -= v * (1.0f - lastStop);
+ // Move the rotation vector to maintain the same direction from p0.
+ p2 += v * firstStop;
+ }
+ Point p3;
+ if (FuzzyEqualsMultiplicative(p2.y, p0.y)) {
+ // rotation vector is horizontal
+ p3 = Point(p0.x, p1.y);
+ } else if (FuzzyEqualsMultiplicative(p2.x, p0.x)) {
+ // rotation vector is vertical
+ p3 = Point(p1.x, p0.y);
+ } else {
+ float m = (p2.y - p0.y) / (p2.x - p0.x); // slope of line p0->p2
+ float mInv = -1.0f / m; // slope of desired perpendicular p0->p3
+ float c1 = p0.y - mInv * p0.x; // line p0->p3 is m * x - y + c1 = 0
+ float c2 = p1.y - m * p1.x; // line p1->p3 is mInv * x - y + c2 = 0
+ float x3 = (c1 - c2) / (m - mInv);
+ float y3 = (c1 * m - c2 * mInv) / (m - mInv);
+ p3 = Point(x3, y3);
+ }
+ RefPtr stops = aColorLine->MakeGradientStops(aState, stopArray);
+ return MakeUnique<LinearGradientPattern>(p0, p3, std::move(stops),
+ Matrix::Scaling(1.0, -1.0));
+ }
+};
+
+struct PaintVarLinearGradient : public PaintLinearGradient {
+ enum { kFormat = 5 };
+ uint32 varIndexBase;
+
+ UniquePtr<Pattern> MakePattern(const PaintState& aState,
+ uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ uint32_t clOffset = aOffset + colorLineOffset;
+ if (clOffset + sizeof(VarColorLine) + sizeof(VarColorStop) >
+ aState.mCOLRLength) {
+ return nullptr;
+ }
+ const auto* colorLine = reinterpret_cast<const VarColorLine*>(
+ aState.COLRv1BaseAddr() + clOffset);
+ Point p0(aState.F2P(ApplyVariation(aState, int16_t(x0), varIndexBase)),
+ aState.F2P(
+ ApplyVariation(aState, int16_t(y0), SatAdd(varIndexBase, 1))));
+ Point p1(aState.F2P(
+ ApplyVariation(aState, int16_t(x1), SatAdd(varIndexBase, 2))),
+ aState.F2P(
+ ApplyVariation(aState, int16_t(y1), SatAdd(varIndexBase, 3))));
+ Point p2(aState.F2P(
+ ApplyVariation(aState, int16_t(x2), SatAdd(varIndexBase, 4))),
+ aState.F2P(
+ ApplyVariation(aState, int16_t(y2), SatAdd(varIndexBase, 5))));
+ return NormalizeAndMakeGradient(aState, colorLine, p0, p1, p2);
+ }
+};
+
+struct PaintRadialGradient : public PaintPatternBase {
+ enum { kFormat = 6 };
+ uint8_t format;
+ Offset24 colorLineOffset;
+ FWORD x0;
+ FWORD y0;
+ UFWORD radius0;
+ FWORD x1;
+ FWORD y1;
+ UFWORD radius1;
+
+ UniquePtr<Pattern> MakePattern(const PaintState& aState,
+ uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ uint32_t clOffset = aOffset + colorLineOffset;
+ if (clOffset + sizeof(ColorLine) + sizeof(ColorStop) > aState.mCOLRLength) {
+ return nullptr;
+ }
+ const auto* colorLine =
+ reinterpret_cast<const ColorLine*>(aState.COLRv1BaseAddr() + clOffset);
+ Point c1(aState.F2P(int16_t(x0)), aState.F2P(int16_t(y0)));
+ Point c2(aState.F2P(int16_t(x1)), aState.F2P(int16_t(y1)));
+ float r1 = aState.F2P(uint16_t(radius0));
+ float r2 = aState.F2P(uint16_t(radius1));
+ return NormalizeAndMakeGradient(aState, colorLine, c1, c2, r1, r2);
+ }
+
+ // Helper function to trim the gradient stops array at the start or end.
+ void TruncateGradientStops(nsTArray<GradientStop>& aStops, float aStart,
+ float aEnd) const {
+ // For pad mode, we may need a sub-range of the line: figure out which
+ // stops to trim, and interpolate as needed at truncation point(s).
+ // (Currently this is only ever used to trim one end of the color line,
+ // so edge cases that may occur when trimming both ends are untested.)
+ MOZ_ASSERT(aStart == 0.0f || aEnd == 1.0f,
+ "Trimming both ends of color-line is untested!");
+
+ // Create a color that is |r| of the way from c1 to c2.
+ auto interpolateColor = [](DeviceColor c1, DeviceColor c2, float r) {
+ return DeviceColor(
+ c2.r * r + c1.r * (1.0f - r), c2.g * r + c1.g * (1.0f - r),
+ c2.b * r + c1.b * (1.0f - r), c2.a * r + c1.a * (1.0f - r));
+ };
+
+ size_t count = aStops.Length();
+ MOZ_ASSERT(count > 1);
+
+ // Truncate at the start of the color line?
+ if (aStart > 0.0f) {
+ // Skip forward past any stops that can be dropped.
+ size_t i = 0;
+ while (i < count - 1 && aStops[i].offset < aStart) {
+ ++i;
+ }
+ // If we're not truncating exactly at a color-stop offset, shift the
+ // preceding stop to the truncation offset and interpolate its color.
+ if (i && aStops[i].offset > aStart) {
+ auto& prev = aStops[i - 1];
+ auto& curr = aStops[i];
+ float ratio = (aStart - prev.offset) / (curr.offset - prev.offset);
+ prev.color = interpolateColor(prev.color, curr.color, ratio);
+ prev.offset = aStart;
+ --i; // We don't want to remove this stop, as we adjusted it.
+ }
+ aStops.RemoveElementsAt(0, i);
+ // Re-normalize the remaining stops to the [0, 1] range.
+ if (aStart < 1.0f) {
+ float r = 1.0f / (1.0f - aStart);
+ for (auto& gs : aStops) {
+ gs.offset = r * (gs.offset - aStart);
+ }
+ }
+ }
+
+ // Truncate at the end of the color line?
+ if (aEnd < 1.0f) {
+ // Skip back over any stops that can be dropped.
+ size_t i = count - 1;
+ while (i && aStops[i].offset > aEnd) {
+ --i;
+ }
+ // If we're not truncating exactly at a color-stop offset, shift the
+ // following stop to the truncation offset and interpolate its color.
+ if (i + 1 < count && aStops[i].offset < aEnd) {
+ auto& next = aStops[i + 1];
+ auto& curr = aStops[i];
+ float ratio = (aEnd - curr.offset) / (next.offset - curr.offset);
+ next.color = interpolateColor(curr.color, next.color, ratio);
+ next.offset = aEnd;
+ ++i;
+ }
+ aStops.RemoveElementsAt(i + 1, count - i - 1);
+ // Re-normalize the remaining stops to the [0, 1] range.
+ if (aEnd > 0.0f) {
+ float r = 1.0f / aEnd;
+ for (auto& gs : aStops) {
+ gs.offset = r * gs.offset;
+ }
+ }
+ }
+ }
+
+ template <typename T>
+ UniquePtr<Pattern> NormalizeAndMakeGradient(const PaintState& aState,
+ const T* aColorLine, Point c1,
+ Point c2, float r1,
+ float r2) const {
+ if ((c1 == c2 && r1 == r2) || (r1 == 0.0 && r2 == 0.0)) {
+ return MakeUnique<ColorPattern>(DeviceColor());
+ }
+ UniquePtr<Pattern> solidColor = aColorLine->AsSolidColor(aState);
+ if (solidColor) {
+ return solidColor;
+ }
+ float firstStop, lastStop;
+ AutoTArray<GradientStop, 8> stopArray;
+ aColorLine->CollectGradientStops(aState, stopArray, &firstStop, &lastStop);
+ if (stopArray.IsEmpty()) {
+ return MakeUnique<ColorPattern>(DeviceColor());
+ }
+ // If the color stop offsets had to be normalized to the [0, 1] range,
+ // adjust the circle positions and radii to match.
+ if (firstStop != 0.0f || lastStop != 1.0f) {
+ if (firstStop == lastStop) {
+ if (aColorLine->extend != T::EXTEND_PAD) {
+ return MakeUnique<ColorPattern>(DeviceColor());
+ }
+ // For extend-pad, when the color line is zero-length, we add a "fake"
+ // color stop to ensure we'll maintain the orientation of the cone,
+ // otherwise when we adjust circles to account for the normalized color
+ // stops, the centers will coalesce and the cone or cylinder collapses.
+ for (auto& gs : stopArray) {
+ gs.offset = 0.0f;
+ }
+ stopArray.AppendElement(
+ GradientStop{1.0f, stopArray.LastElement().color});
+ lastStop += 1.0f;
+ }
+ // Adjust centers along the vector between them, and scale radii for
+ // gradient line defined from 0.0 to 1.0.
+ Point vec = c2 - c1;
+ c1 += vec * firstStop;
+ c2 -= vec * (1.0f - lastStop);
+ float deltaR = r2 - r1;
+ r1 = r1 + deltaR * firstStop;
+ r2 = r2 - deltaR * (1.0f - lastStop);
+ }
+ if ((r1 < 0.0f || r2 < 0.0f) && aColorLine->extend == T::EXTEND_PAD) {
+ // For EXTEND_PAD, we can restrict the gradient definition to just its
+ // visible portion because the shader doesn't need to see any part of the
+ // color line that extends into the negative-radius "virtual cone".
+ if (r1 < 0.0f && r2 < 0.0f) {
+ // If both radii are negative, then only the color at the closer circle
+ // will appear in the projected positive cone (or if they're equal,
+ // nothing will be visible at all).
+ if (r1 == r2) {
+ return MakeUnique<ColorPattern>(DeviceColor());
+ }
+ // The defined range of the color line is entirely in the invisible
+ // cone; all that will project into visible space is a single color.
+ if (r1 < r2) {
+ // Keep only the last color stop.
+ stopArray.RemoveElementsAt(0, stopArray.Length() - 1);
+ } else {
+ // Keep only the first color stop.
+ stopArray.RemoveElementsAt(1, stopArray.Length() - 1);
+ }
+ } else {
+ // Truncate the gradient at the tip of the visible cone: find the color
+ // stops closest to that point and interpolate between them.
+ if (r1 < r2) {
+ float start = r1 / (r1 - r2);
+ TruncateGradientStops(stopArray, start, 1.0f);
+ r1 = 0.0f;
+ c1 = c1 * (1.0f - start) + c2 * start;
+ } else if (r2 < r1) {
+ float end = 1.0f - r2 / (r2 - r1);
+ TruncateGradientStops(stopArray, 0.0f, end);
+ r2 = 0.0f;
+ c2 = c1 * (1.0f - end) + c2 * end;
+ }
+ }
+ }
+ // Handle negative radii, which the shader won't understand directly, by
+ // projecting the circles along the cones such that both radii are positive.
+ if (r1 < 0.0f || r2 < 0.0f) {
+ float deltaR = r2 - r1;
+ // If deltaR is zero, then nothing is visible because the cone has
+ // degenerated into a negative-radius cylinder, and does not project
+ // into visible space at all.
+ if (deltaR == 0.0f) {
+ return MakeUnique<ColorPattern>(DeviceColor());
+ }
+ Point vec = c2 - c1;
+ if (aColorLine->extend == T::EXTEND_REFLECT) {
+ deltaR *= 2.0f;
+ vec = vec * 2.0f;
+ }
+ if (r2 < r1) {
+ vec = -vec;
+ deltaR = -deltaR;
+ }
+ // Number of repeats by which we need to shift.
+ float n = std::ceil(std::max(-r1, -r2) / deltaR);
+ deltaR *= n;
+ r1 += deltaR;
+ r2 += deltaR;
+ vec = vec * n;
+ c1 += vec;
+ c2 += vec;
+ }
+ RefPtr stops = aColorLine->MakeGradientStops(aState, stopArray);
+ if (!stops) {
+ return MakeUnique<ColorPattern>(DeviceColor());
+ }
+ return MakeUnique<RadialGradientPattern>(c1, c2, r1, r2, std::move(stops),
+ Matrix::Scaling(1.0, -1.0));
+ }
+};
+
+struct PaintVarRadialGradient : public PaintRadialGradient {
+ enum { kFormat = 7 };
+ uint32 varIndexBase;
+
+ UniquePtr<Pattern> MakePattern(const PaintState& aState,
+ uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ uint32_t clOffset = aOffset + colorLineOffset;
+ if (clOffset + sizeof(VarColorLine) + sizeof(VarColorStop) >
+ aState.mCOLRLength) {
+ return nullptr;
+ }
+ const auto* colorLine = reinterpret_cast<const VarColorLine*>(
+ aState.COLRv1BaseAddr() + clOffset);
+ Point c1(aState.F2P(ApplyVariation(aState, int16_t(x0), varIndexBase)),
+ aState.F2P(
+ ApplyVariation(aState, int16_t(y0), SatAdd(varIndexBase, 1))));
+ float r1 = aState.F2P(
+ ApplyVariation(aState, uint16_t(radius0), SatAdd(varIndexBase, 2)));
+ Point c2(aState.F2P(
+ ApplyVariation(aState, int16_t(x1), SatAdd(varIndexBase, 3))),
+ aState.F2P(
+ ApplyVariation(aState, int16_t(y1), SatAdd(varIndexBase, 4))));
+ float r2 = aState.F2P(
+ ApplyVariation(aState, uint16_t(radius1), SatAdd(varIndexBase, 5)));
+ return NormalizeAndMakeGradient(aState, colorLine, c1, c2, r1, r2);
+ }
+};
+
+struct PaintSweepGradient : public PaintPatternBase {
+ enum { kFormat = 8 };
+ uint8_t format;
+ Offset24 colorLineOffset;
+ FWORD centerX;
+ FWORD centerY;
+ F2DOT14 startAngle;
+ F2DOT14 endAngle;
+
+ UniquePtr<Pattern> MakePattern(const PaintState& aState,
+ uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ uint32_t clOffset = aOffset + colorLineOffset;
+ if (clOffset + sizeof(ColorLine) + sizeof(ColorStop) > aState.mCOLRLength) {
+ return nullptr;
+ }
+ const auto* colorLine =
+ reinterpret_cast<const ColorLine*>(aState.COLRv1BaseAddr() + clOffset);
+ float start = float(startAngle) + 1.0f;
+ float end = float(endAngle) + 1.0f;
+ Point center(aState.F2P(int16_t(centerX)), aState.F2P(int16_t(centerY)));
+ return NormalizeAndMakeGradient(aState, colorLine, center, start, end);
+ }
+
+ template <typename T>
+ UniquePtr<Pattern> NormalizeAndMakeGradient(const PaintState& aState,
+ const T* aColorLine,
+ Point aCenter, float aStart,
+ float aEnd) const {
+ if (aStart == aEnd && aColorLine->extend != T::EXTEND_PAD) {
+ return MakeUnique<ColorPattern>(DeviceColor());
+ }
+ UniquePtr<Pattern> solidColor = aColorLine->AsSolidColor(aState);
+ if (solidColor) {
+ return solidColor;
+ }
+ // ConicGradientPattern works counterclockwise. If the gradient is defined
+ // clockwise (with aStart greater than aEnd), we'll reverse the color line
+ // and swap the start and end angles.
+ bool reverse = aEnd < aStart;
+ float firstStop, lastStop;
+ RefPtr stops =
+ aColorLine->MakeGradientStops(aState, &firstStop, &lastStop, reverse);
+ if (!stops) {
+ return nullptr;
+ }
+ if (firstStop != 0.0 || lastStop != 1.0) {
+ if (firstStop == lastStop) {
+ if (aColorLine->extend != T::EXTEND_PAD) {
+ return MakeUnique<ColorPattern>(DeviceColor());
+ }
+ } else {
+ float sweep = aEnd - aStart;
+ aStart = aStart + sweep * firstStop;
+ aEnd = aStart + sweep * (lastStop - firstStop);
+ }
+ }
+ if (reverse) {
+ std::swap(aStart, aEnd);
+ }
+ return MakeUnique<ConicGradientPattern>(aCenter, M_PI / 2.0, aStart / 2.0,
+ aEnd / 2.0, std::move(stops),
+ Matrix::Scaling(1.0, -1.0));
+ }
+};
+
+struct PaintVarSweepGradient : public PaintSweepGradient {
+ enum { kFormat = 9 };
+ uint32 varIndexBase;
+
+ UniquePtr<Pattern> MakePattern(const PaintState& aState,
+ uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ uint32_t clOffset = aOffset + colorLineOffset;
+ if (clOffset + sizeof(VarColorLine) + sizeof(VarColorStop) >
+ aState.mCOLRLength) {
+ return nullptr;
+ }
+ const auto* colorLine = reinterpret_cast<const VarColorLine*>(
+ aState.COLRv1BaseAddr() + clOffset);
+ float start =
+ ApplyVariation(aState, startAngle, SatAdd(varIndexBase, 2)) + 1.0f;
+ float end =
+ ApplyVariation(aState, endAngle, SatAdd(varIndexBase, 3)) + 1.0f;
+ Point center(
+ aState.F2P(ApplyVariation(aState, int16_t(centerX), varIndexBase)),
+ aState.F2P(
+ ApplyVariation(aState, int16_t(centerY), SatAdd(varIndexBase, 1))));
+ return NormalizeAndMakeGradient(aState, colorLine, center, start, end);
+ }
+};
+
+struct PaintGlyph {
+ enum { kFormat = 10 };
+ uint8_t format;
+ Offset24 paintOffset;
+ uint16 glyphID;
+
+ bool Paint(const PaintState& aState, uint32_t aOffset,
+ const Rect* aBounds) const {
+ MOZ_ASSERT(format == kFormat);
+ if (!paintOffset) {
+ return true;
+ }
+ Glyph g{uint16_t(glyphID), Point()};
+ GlyphBuffer buffer{&g, 1};
+ // If the paint is a simple fill (rather than a sub-graph of further paint
+ // records), we can just use FillGlyphs to render it instead of setting up
+ // a clip.
+ UniquePtr<Pattern> fillPattern =
+ DispatchMakePattern(aState, aOffset + paintOffset);
+ if (fillPattern) {
+ // On macOS we can't use FillGlyphs because when we render the glyph,
+ // Core Text's own color font support may step in and ignore the
+ // pattern. So to avoid this, fill the glyph as a path instead.
+#if XP_MACOSX
+ RefPtr<Path> path =
+ aState.mScaledFont->GetPathForGlyphs(buffer, aState.mDrawTarget);
+ aState.mDrawTarget->Fill(path, *fillPattern, aState.mDrawOptions);
+#else
+ aState.mDrawTarget->FillGlyphs(aState.mScaledFont, buffer, *fillPattern,
+ aState.mDrawOptions);
+#endif
+ return true;
+ }
+ RefPtr<Path> path =
+ aState.mScaledFont->GetPathForGlyphs(buffer, aState.mDrawTarget);
+ aState.mDrawTarget->PushClip(path);
+ bool ok = DispatchPaint(aState, aOffset + paintOffset, aBounds);
+ aState.mDrawTarget->PopClip();
+ return ok;
+ }
+
+ Rect GetBoundingRect(const PaintState& aState, uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ Glyph g{uint16_t(glyphID), Point()};
+ GlyphBuffer buffer{&g, 1};
+ RefPtr<Path> path =
+ aState.mScaledFont->GetPathForGlyphs(buffer, aState.mDrawTarget);
+ return path->GetFastBounds();
+ }
+};
+
+struct PaintColrGlyph {
+ enum { kFormat = 11 };
+ uint8_t format;
+ uint16 glyphID;
+
+ // Factored out as a helper because this is also used by the top-level
+ // PaintGlyphGraph function.
+ static bool DoPaint(const PaintState& aState,
+ const BaseGlyphPaintRecord* aBaseGlyphPaint,
+ uint32_t aGlyphId, const Rect* aBounds) {
+ AutoPopClips clips(aState.mDrawTarget);
+ Rect clipRect;
+ if (const auto* clipList = aState.mHeader.v1->clipList()) {
+ if (const auto* clip = clipList->GetClip(aGlyphId)) {
+ clipRect = clip->GetRect(aState);
+ clips.PushClipRect(clipRect);
+ if (!aBounds) {
+ aBounds = &clipRect;
+ }
+ }
+ }
+ return DispatchPaint(
+ aState,
+ aState.mHeader.v1->baseGlyphListOffset + aBaseGlyphPaint->paintOffset,
+ aBounds);
+ }
+
+ bool Paint(const PaintState& aState, uint32_t aOffset,
+ const Rect* aBounds) const {
+ MOZ_ASSERT(format == kFormat);
+ IF_CYCLE_RETURN(true);
+ const auto* base = aState.mHeader.v1->GetBaseGlyphPaint(glyphID);
+ return base ? DoPaint(aState, base, uint16_t(glyphID), aBounds) : false;
+ }
+
+ Rect GetBoundingRect(const PaintState& aState, uint32_t aOffset) const {
+ IF_CYCLE_RETURN(Rect());
+ if (const auto* clipList = aState.mHeader.v1->clipList()) {
+ if (const auto* clip = clipList->GetClip(uint16_t(glyphID))) {
+ return clip->GetRect(aState);
+ }
+ }
+ if (const auto* base =
+ aState.mHeader.v1->GetBaseGlyphPaint(uint16_t(glyphID))) {
+ return DispatchGetBounds(
+ aState, aState.mHeader.v1->baseGlyphListOffset + base->paintOffset);
+ }
+ return Rect();
+ }
+};
+
+#undef IF_CYCLE_RETURN
+
+struct Affine2x3 {
+ Fixed xx;
+ Fixed yx;
+ Fixed xy;
+ Fixed yy;
+ Fixed dx;
+ Fixed dy;
+
+ Matrix AsMatrix(const PaintState& aState) const {
+ // Flip signs because of opposite y-axis direction in moz2d vs opentype.
+ return Matrix(float(xx), -float(yx), -float(xy), float(yy),
+ aState.F2P(float(dx)), -aState.F2P(float(dy)));
+ }
+};
+
+struct VarAffine2x3 : public Affine2x3 {
+ uint32 varIndexBase;
+
+ Matrix AsMatrix(const PaintState& aState) const {
+ return Matrix(
+ ApplyVariation(aState, xx, varIndexBase),
+ -ApplyVariation(aState, yx, SatAdd(varIndexBase, 1)),
+ -ApplyVariation(aState, xy, SatAdd(varIndexBase, 2)),
+ ApplyVariation(aState, yy, SatAdd(varIndexBase, 3)),
+ aState.F2P(ApplyVariation(aState, dx, SatAdd(varIndexBase, 4))),
+ -aState.F2P(ApplyVariation(aState, dy, SatAdd(varIndexBase, 5))));
+ };
+};
+
+struct PaintTransformBase {
+ uint8_t format;
+ Offset24 paintOffset;
+
+ bool Paint(const PaintState& aState, uint32_t aOffset,
+ const Rect* aBounds) const {
+ if (!paintOffset) {
+ return true;
+ }
+ AutoRestoreTransform saveTransform(aState.mDrawTarget);
+ aState.mDrawTarget->ConcatTransform(DispatchGetMatrix(aState, aOffset));
+ return DispatchPaint(aState, aOffset + paintOffset, aBounds);
+ }
+
+ Rect GetBoundingRect(const PaintState& aState, uint32_t aOffset) const {
+ if (!paintOffset) {
+ return Rect();
+ }
+ Rect bounds = DispatchGetBounds(aState, aOffset + paintOffset);
+ bounds = DispatchGetMatrix(aState, aOffset).TransformBounds(bounds);
+ return bounds;
+ }
+};
+
+struct PaintTransform : public PaintTransformBase {
+ enum { kFormat = 12 };
+ Offset24 transformOffset;
+
+ Matrix GetMatrix(const PaintState& aState, uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ if (aOffset + transformOffset + sizeof(Affine2x3) > aState.mCOLRLength) {
+ return Matrix();
+ }
+ const auto* t = reinterpret_cast<const Affine2x3*>(
+ aState.COLRv1BaseAddr() + aOffset + transformOffset);
+ return t->AsMatrix(aState);
+ }
+};
+
+struct PaintVarTransform : public PaintTransformBase {
+ enum { kFormat = 13 };
+ Offset24 transformOffset;
+
+ Matrix GetMatrix(const PaintState& aState, uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ if (aOffset + transformOffset + sizeof(VarAffine2x3) > aState.mCOLRLength) {
+ return Matrix();
+ }
+ const auto* t = reinterpret_cast<const VarAffine2x3*>(
+ aState.COLRv1BaseAddr() + aOffset + transformOffset);
+ return t->AsMatrix(aState);
+ }
+};
+
+struct PaintTranslate : public PaintTransformBase {
+ enum { kFormat = 14 };
+ FWORD dx;
+ FWORD dy;
+
+ Matrix GetMatrix(const PaintState& aState, uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ return Matrix::Translation(aState.F2P(int16_t(dx)),
+ -aState.F2P(int16_t(dy)));
+ }
+};
+
+struct PaintVarTranslate : public PaintTranslate {
+ enum { kFormat = 15 };
+ uint32 varIndexBase;
+
+ Matrix GetMatrix(const PaintState& aState, uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ return Matrix::Translation(
+ aState.F2P(ApplyVariation(aState, int16_t(dx), varIndexBase)),
+ -aState.F2P(
+ ApplyVariation(aState, int16_t(dy), SatAdd(varIndexBase, 1))));
+ }
+};
+
+struct PaintScale : public PaintTransformBase {
+ enum { kFormat = 16 };
+ F2DOT14 scaleX;
+ F2DOT14 scaleY;
+
+ Matrix GetMatrix(const PaintState& aState, uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ return Matrix::Scaling(float(scaleX), float(scaleY));
+ }
+};
+
+struct PaintVarScale : public PaintScale {
+ enum { kFormat = 17 };
+ uint32 varIndexBase;
+
+ Matrix GetMatrix(const PaintState& aState, uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ return Matrix::Scaling(
+ ApplyVariation(aState, scaleX, varIndexBase),
+ ApplyVariation(aState, scaleY, SatAdd(varIndexBase, 1)));
+ }
+};
+
+struct PaintScaleAroundCenter : public PaintTransformBase {
+ enum { kFormat = 18 };
+ F2DOT14 scaleX;
+ F2DOT14 scaleY;
+ FWORD centerX;
+ FWORD centerY;
+
+ Matrix GetMatrix(const PaintState& aState, uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ Point center(aState.F2P(int16_t(centerX)), -aState.F2P(int16_t(centerY)));
+ return Matrix::Translation(center)
+ .PreScale(float(scaleX), float(scaleY))
+ .PreTranslate(-center);
+ }
+};
+
+struct PaintVarScaleAroundCenter : public PaintScaleAroundCenter {
+ enum { kFormat = 19 };
+ uint32 varIndexBase;
+
+ Matrix GetMatrix(const PaintState& aState, uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ Point center(aState.F2P(ApplyVariation(aState, int16_t(centerX),
+ SatAdd(varIndexBase, 2))),
+ -aState.F2P(ApplyVariation(aState, int16_t(centerY),
+ SatAdd(varIndexBase, 3))));
+ return Matrix::Translation(center)
+ .PreScale(ApplyVariation(aState, scaleX, varIndexBase),
+ ApplyVariation(aState, scaleY, SatAdd(varIndexBase, 1)))
+ .PreTranslate(-center);
+ }
+};
+
+struct PaintScaleUniform : public PaintTransformBase {
+ enum { kFormat = 20 };
+ F2DOT14 scale;
+
+ Matrix GetMatrix(const PaintState& aState, uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ return Matrix::Scaling(float(scale), float(scale));
+ }
+};
+
+struct PaintVarScaleUniform : public PaintScaleUniform {
+ enum { kFormat = 21 };
+ uint32 varIndexBase;
+
+ Matrix GetMatrix(const PaintState& aState, uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ float sc = ApplyVariation(aState, scale, varIndexBase);
+ return Matrix::Scaling(sc, sc);
+ }
+};
+
+struct PaintScaleUniformAroundCenter : public PaintTransformBase {
+ enum { kFormat = 22 };
+ F2DOT14 scale;
+ FWORD centerX;
+ FWORD centerY;
+
+ Matrix GetMatrix(const PaintState& aState, uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ Point center(aState.F2P(int16_t(centerX)), -aState.F2P(int16_t(centerY)));
+ return Matrix::Translation(center)
+ .PreScale(float(scale), float(scale))
+ .PreTranslate(-center);
+ }
+};
+
+struct PaintVarScaleUniformAroundCenter : public PaintScaleUniformAroundCenter {
+ enum { kFormat = 23 };
+ uint32 varIndexBase;
+
+ Matrix GetMatrix(const PaintState& aState, uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ float sc = ApplyVariation(aState, scale, varIndexBase);
+ Point center(aState.F2P(ApplyVariation(aState, int16_t(centerX),
+ SatAdd(varIndexBase, 1))),
+ -aState.F2P(ApplyVariation(aState, int16_t(centerY),
+ SatAdd(varIndexBase, 2))));
+ return Matrix::Translation(center).PreScale(sc, sc).PreTranslate(-center);
+ }
+};
+
+struct PaintRotate : public PaintTransformBase {
+ enum { kFormat = 24 };
+ F2DOT14 angle;
+
+ Matrix GetMatrix(const PaintState& aState, uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ return Matrix::Rotation(-float(angle) * float(M_PI));
+ }
+};
+
+struct PaintVarRotate : public PaintRotate {
+ enum { kFormat = 25 };
+ uint32 varIndexBase;
+
+ Matrix GetMatrix(const PaintState& aState, uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ float ang = ApplyVariation(aState, angle, varIndexBase);
+ return Matrix::Rotation(-ang * float(M_PI));
+ }
+};
+
+struct PaintRotateAroundCenter : public PaintTransformBase {
+ enum { kFormat = 26 };
+ F2DOT14 angle;
+ FWORD centerX;
+ FWORD centerY;
+
+ Matrix GetMatrix(const PaintState& aState, uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ Point center(aState.F2P(int16_t(centerX)), -aState.F2P(int16_t(centerY)));
+ return Matrix::Translation(center)
+ .PreRotate(-float(angle) * float(M_PI))
+ .PreTranslate(-center);
+ }
+};
+
+struct PaintVarRotateAroundCenter : public PaintRotateAroundCenter {
+ enum { kFormat = 27 };
+ uint32 varIndexBase;
+
+ Matrix GetMatrix(const PaintState& aState, uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ float ang = ApplyVariation(aState, angle, varIndexBase);
+ Point center(aState.F2P(ApplyVariation(aState, int16_t(centerX),
+ SatAdd(varIndexBase, 1))),
+ -aState.F2P(ApplyVariation(aState, int16_t(centerY),
+ SatAdd(varIndexBase, 2))));
+ return Matrix::Translation(center)
+ .PreRotate(-ang * float(M_PI))
+ .PreTranslate(-center);
+ }
+};
+
+static inline Matrix SkewMatrix(float aSkewX, float aSkewY) {
+ float xy = tanf(aSkewX * float(M_PI));
+ float yx = tanf(aSkewY * float(M_PI));
+ return std::isnan(xy) || std::isnan(yx) ? Matrix()
+ : Matrix(1.0, -yx, xy, 1.0, 0.0, 0.0);
+}
+
+struct PaintSkew : public PaintTransformBase {
+ enum { kFormat = 28 };
+ F2DOT14 xSkewAngle;
+ F2DOT14 ySkewAngle;
+
+ Matrix GetMatrix(const PaintState& aState, uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ return SkewMatrix(float(xSkewAngle), float(ySkewAngle));
+ }
+};
+
+struct PaintVarSkew : public PaintSkew {
+ enum { kFormat = 29 };
+ uint32 varIndexBase;
+
+ Matrix GetMatrix(const PaintState& aState, uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ return SkewMatrix(
+ float(ApplyVariation(aState, xSkewAngle, varIndexBase)),
+ float(ApplyVariation(aState, ySkewAngle, SatAdd(varIndexBase, 1))));
+ }
+};
+
+struct PaintSkewAroundCenter : public PaintTransformBase {
+ enum { kFormat = 30 };
+ F2DOT14 xSkewAngle;
+ F2DOT14 ySkewAngle;
+ FWORD centerX;
+ FWORD centerY;
+
+ Matrix GetMatrix(const PaintState& aState, uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ Point center(aState.F2P(int16_t(centerX)), -aState.F2P(int16_t(centerY)));
+ return Matrix::Translation(center)
+ .PreMultiply(SkewMatrix(float(xSkewAngle), float(ySkewAngle)))
+ .PreTranslate(-center);
+ }
+};
+
+struct PaintVarSkewAroundCenter : public PaintSkewAroundCenter {
+ enum { kFormat = 31 };
+ uint32 varIndexBase;
+
+ Matrix GetMatrix(const PaintState& aState, uint32_t aOffset) const {
+ MOZ_ASSERT(format == kFormat);
+ Point center(aState.F2P(ApplyVariation(aState, int16_t(centerX),
+ SatAdd(varIndexBase, 2))),
+ -aState.F2P(ApplyVariation(aState, int16_t(centerY),
+ SatAdd(varIndexBase, 3))));
+ return Matrix::Translation(center)
+ .PreMultiply(SkewMatrix(
+ ApplyVariation(aState, xSkewAngle, varIndexBase),
+ ApplyVariation(aState, ySkewAngle, SatAdd(varIndexBase, 1))))
+ .PreTranslate(-center);
+ }
+};
+
+struct PaintComposite {
+ enum { kFormat = 32 };
+ uint8_t format;
+ Offset24 sourcePaintOffset;
+ uint8_t compositeMode;
+ Offset24 backdropPaintOffset;
+
+ enum {
+ COMPOSITE_CLEAR = 0,
+ COMPOSITE_SRC = 1,
+ COMPOSITE_DEST = 2,
+ COMPOSITE_SRC_OVER = 3,
+ COMPOSITE_DEST_OVER = 4,
+ COMPOSITE_SRC_IN = 5,
+ COMPOSITE_DEST_IN = 6,
+ COMPOSITE_SRC_OUT = 7,
+ COMPOSITE_DEST_OUT = 8,
+ COMPOSITE_SRC_ATOP = 9,
+ COMPOSITE_DEST_ATOP = 10,
+ COMPOSITE_XOR = 11,
+ COMPOSITE_PLUS = 12,
+ COMPOSITE_SCREEN = 13,
+ COMPOSITE_OVERLAY = 14,
+ COMPOSITE_DARKEN = 15,
+ COMPOSITE_LIGHTEN = 16,
+ COMPOSITE_COLOR_DODGE = 17,
+ COMPOSITE_COLOR_BURN = 18,
+ COMPOSITE_HARD_LIGHT = 19,
+ COMPOSITE_SOFT_LIGHT = 20,
+ COMPOSITE_DIFFERENCE = 21,
+ COMPOSITE_EXCLUSION = 22,
+ COMPOSITE_MULTIPLY = 23,
+ COMPOSITE_HSL_HUE = 24,
+ COMPOSITE_HSL_SATURATION = 25,
+ COMPOSITE_HSL_COLOR = 26,
+ COMPOSITE_HSL_LUMINOSITY = 27
+ };
+
+ bool Paint(const PaintState& aState, uint32_t aOffset,
+ const Rect* aBounds) const {
+ MOZ_ASSERT(format == kFormat);
+ if (!backdropPaintOffset || !sourcePaintOffset) {
+ return true;
+ }
+ auto mapCompositionMode = [](uint8_t aMode) -> CompositionOp {
+ switch (aMode) {
+ default:
+ return CompositionOp::OP_SOURCE;
+ case COMPOSITE_CLEAR:
+ case COMPOSITE_SRC:
+ case COMPOSITE_DEST:
+ MOZ_ASSERT_UNREACHABLE("should have short-circuited");
+ return CompositionOp::OP_SOURCE;
+ case COMPOSITE_SRC_OVER:
+ return CompositionOp::OP_OVER;
+ case COMPOSITE_DEST_OVER:
+ return CompositionOp::OP_DEST_OVER;
+ case COMPOSITE_SRC_IN:
+ return CompositionOp::OP_IN;
+ case COMPOSITE_DEST_IN:
+ return CompositionOp::OP_DEST_IN;
+ case COMPOSITE_SRC_OUT:
+ return CompositionOp::OP_OUT;
+ case COMPOSITE_DEST_OUT:
+ return CompositionOp::OP_DEST_OUT;
+ case COMPOSITE_SRC_ATOP:
+ return CompositionOp::OP_ATOP;
+ case COMPOSITE_DEST_ATOP:
+ return CompositionOp::OP_DEST_ATOP;
+ case COMPOSITE_XOR:
+ return CompositionOp::OP_XOR;
+ case COMPOSITE_PLUS:
+ return CompositionOp::OP_ADD;
+ case COMPOSITE_SCREEN:
+ return CompositionOp::OP_SCREEN;
+ case COMPOSITE_OVERLAY:
+ return CompositionOp::OP_OVERLAY;
+ case COMPOSITE_DARKEN:
+ return CompositionOp::OP_DARKEN;
+ case COMPOSITE_LIGHTEN:
+ return CompositionOp::OP_LIGHTEN;
+ case COMPOSITE_COLOR_DODGE:
+ return CompositionOp::OP_COLOR_DODGE;
+ case COMPOSITE_COLOR_BURN:
+ return CompositionOp::OP_COLOR_BURN;
+ case COMPOSITE_HARD_LIGHT:
+ return CompositionOp::OP_HARD_LIGHT;
+ case COMPOSITE_SOFT_LIGHT:
+ return CompositionOp::OP_SOFT_LIGHT;
+ case COMPOSITE_DIFFERENCE:
+ return CompositionOp::OP_DIFFERENCE;
+ case COMPOSITE_EXCLUSION:
+ return CompositionOp::OP_EXCLUSION;
+ case COMPOSITE_MULTIPLY:
+ return CompositionOp::OP_MULTIPLY;
+ case COMPOSITE_HSL_HUE:
+ return CompositionOp::OP_HUE;
+ case COMPOSITE_HSL_SATURATION:
+ return CompositionOp::OP_SATURATION;
+ case COMPOSITE_HSL_COLOR:
+ return CompositionOp::OP_COLOR;
+ case COMPOSITE_HSL_LUMINOSITY:
+ return CompositionOp::OP_LUMINOSITY;
+ }
+ };
+ // Short-circuit cases:
+ if (compositeMode == COMPOSITE_CLEAR) {
+ return true;
+ }
+ if (compositeMode == COMPOSITE_SRC) {
+ return DispatchPaint(aState, aOffset + sourcePaintOffset, aBounds);
+ }
+ if (compositeMode == COMPOSITE_DEST) {
+ return DispatchPaint(aState, aOffset + backdropPaintOffset, aBounds);
+ }
+
+ // We need bounds for the temporary surfaces; so if we didn't have
+ // explicitly-provided bounds from a clipList entry for the top-level
+ // glyph, then we need to determine the bounding rect here.
+ Rect bounds = aBounds ? *aBounds : GetBoundingRect(aState, aOffset);
+ if (bounds.IsEmpty()) {
+ return true;
+ }
+ bounds.RoundOut();
+
+ PaintState state = aState;
+ state.mDrawOptions.mCompositionOp = CompositionOp::OP_OVER;
+ IntSize intSize(int(bounds.width), int(bounds.height));
+
+ if (!aState.mDrawTarget->CanCreateSimilarDrawTarget(
+ intSize, SurfaceFormat::B8G8R8A8)) {
+ // We're not going to be able to render this, so just bail out.
+ // (Returning true rather than false means we'll just not paint this
+ // part of the glyph, but won't return an error and likely fall back
+ // to an ugly black blob.)
+ return true;
+ }
+
+ // Draw the backdrop paint graph to a temporary surface.
+ RefPtr backdrop = aState.mDrawTarget->CreateSimilarDrawTarget(
+ intSize, SurfaceFormat::B8G8R8A8);
+ if (!backdrop) {
+ return true;
+ }
+ backdrop->SetTransform(Matrix::Translation(-bounds.TopLeft()));
+ state.mDrawTarget = backdrop;
+ if (!DispatchPaint(state, aOffset + backdropPaintOffset, &bounds)) {
+ return false;
+ }
+
+ // Draw the source paint graph to another temp surface.
+ RefPtr source = aState.mDrawTarget->CreateSimilarDrawTarget(
+ intSize, SurfaceFormat::B8G8R8A8);
+ if (!source) {
+ return true;
+ }
+ source->SetTransform(Matrix::Translation(-bounds.TopLeft()));
+ state.mDrawTarget = source;
+ if (!DispatchPaint(state, aOffset + sourcePaintOffset, &bounds)) {
+ return false;
+ }
+
+ // Composite the source onto the backdrop using the specified operation.
+ Rect localBounds(Point(), bounds.Size());
+ RefPtr snapshot = source->Snapshot();
+ backdrop->SetTransform(Matrix());
+ backdrop->DrawSurface(snapshot, localBounds, localBounds,
+ DrawSurfaceOptions(),
+ DrawOptions(1.0, mapCompositionMode(compositeMode)));
+
+ // And copy the composited result to our final destination.
+ snapshot = backdrop->Snapshot();
+ aState.mDrawTarget->DrawSurface(snapshot, bounds, localBounds);
+
+ return true;
+ }
+
+ Rect GetBoundingRect(const PaintState& aState, uint32_t aOffset) const {
+ if (!backdropPaintOffset || !sourcePaintOffset) {
+ return Rect();
+ }
+ // For now, just return the maximal bounds that could result; this could be
+ // smarter, returning just one of the rects or their intersection when
+ // appropriate for the composite mode in effect.
+ return DispatchGetBounds(aState, aOffset + backdropPaintOffset)
+ .Union(DispatchGetBounds(aState, aOffset + sourcePaintOffset));
+ }
+};
+
+#pragma pack()
+
+const BaseGlyphPaintRecord* COLRv1Header::GetBaseGlyphPaint(
+ uint32_t aGlyphId) const {
+ const auto* list = baseGlyphList();
+ if (!list) {
+ return nullptr;
+ }
+ auto compare = [](const void* key, const void* data) -> int {
+ uint32_t glyphId = (uint32_t)(uintptr_t)key;
+ const auto* paintRecord =
+ reinterpret_cast<const BaseGlyphPaintRecord*>(data);
+ uint32_t baseGlyphId = uint16_t(paintRecord->glyphID);
+ if (baseGlyphId == glyphId) {
+ return 0;
+ }
+ return baseGlyphId > glyphId ? -1 : 1;
+ };
+ return reinterpret_cast<const BaseGlyphPaintRecord*>(
+ bsearch((void*)(uintptr_t)aGlyphId, list + 1,
+ uint32_t(list->numBaseGlyphPaintRecords),
+ sizeof(BaseGlyphPaintRecord), compare));
+}
+
+#define DO_CASE_VAR(T) \
+ DO_CASE(Paint##T); \
+ DO_CASE(PaintVar##T)
+
+// Process paint table at aOffset from start of COLRv1 table.
+static bool DispatchPaint(const PaintState& aState, uint32_t aOffset,
+ const Rect* aBounds) {
+ if (aOffset >= aState.mCOLRLength) {
+ return false;
+ }
+
+ const char* paint = aState.COLRv1BaseAddr() + aOffset;
+ // All paint table formats start with an 8-bit 'format' field.
+ uint8_t format = uint8_t(*paint);
+
+#define DO_CASE(T) \
+ case T::kFormat: \
+ return aOffset + sizeof(T) <= aState.mCOLRLength \
+ ? reinterpret_cast<const T*>(paint)->Paint(aState, aOffset, \
+ aBounds) \
+ : false
+
+ switch (format) {
+ DO_CASE(PaintColrLayers);
+ DO_CASE_VAR(Solid);
+ DO_CASE_VAR(LinearGradient);
+ DO_CASE_VAR(RadialGradient);
+ DO_CASE_VAR(SweepGradient);
+ DO_CASE(PaintGlyph);
+ DO_CASE(PaintColrGlyph);
+ DO_CASE_VAR(Transform);
+ DO_CASE_VAR(Translate);
+ DO_CASE_VAR(Scale);
+ DO_CASE_VAR(ScaleAroundCenter);
+ DO_CASE_VAR(ScaleUniform);
+ DO_CASE_VAR(ScaleUniformAroundCenter);
+ DO_CASE_VAR(Rotate);
+ DO_CASE_VAR(RotateAroundCenter);
+ DO_CASE_VAR(Skew);
+ DO_CASE_VAR(SkewAroundCenter);
+ DO_CASE(PaintComposite);
+ default:
+ break;
+ }
+
+#undef DO_CASE
+
+ return false;
+}
+
+// Get a gfx::Pattern corresponding to the given paint table, if it is a
+// simple format that can be used as a fill (not a sub-graph).
+static UniquePtr<Pattern> DispatchMakePattern(const PaintState& aState,
+ uint32_t aOffset) {
+ if (aOffset >= aState.mCOLRLength) {
+ return nullptr;
+ }
+
+ const char* paint = aState.COLRv1BaseAddr() + aOffset;
+ // All paint table formats start with an 8-bit 'format' field.
+ uint8_t format = uint8_t(*paint);
+
+#define DO_CASE(T) \
+ case T::kFormat: \
+ return aOffset + sizeof(T) <= aState.mCOLRLength \
+ ? reinterpret_cast<const T*>(paint)->MakePattern(aState, \
+ aOffset) \
+ : nullptr;
+
+ switch (format) {
+ DO_CASE_VAR(Solid);
+ DO_CASE_VAR(LinearGradient);
+ DO_CASE_VAR(RadialGradient);
+ DO_CASE_VAR(SweepGradient);
+ default:
+ break;
+ }
+
+#undef DO_CASE
+
+ return nullptr;
+}
+
+static Matrix DispatchGetMatrix(const PaintState& aState, uint32_t aOffset) {
+ if (aOffset >= aState.mCOLRLength) {
+ return Matrix();
+ }
+
+ const char* paint = aState.COLRv1BaseAddr() + aOffset;
+ // All paint table formats start with an 8-bit 'format' field.
+ uint8_t format = uint8_t(*paint);
+
+#define DO_CASE(T) \
+ case T::kFormat: \
+ return aOffset + sizeof(T) <= aState.mCOLRLength \
+ ? reinterpret_cast<const T*>(paint)->GetMatrix(aState, aOffset) \
+ : Matrix();
+
+ switch (format) {
+ DO_CASE_VAR(Transform);
+ DO_CASE_VAR(Translate);
+ DO_CASE_VAR(Scale);
+ DO_CASE_VAR(ScaleAroundCenter);
+ DO_CASE_VAR(ScaleUniform);
+ DO_CASE_VAR(ScaleUniformAroundCenter);
+ DO_CASE_VAR(Rotate);
+ DO_CASE_VAR(RotateAroundCenter);
+ DO_CASE_VAR(Skew);
+ DO_CASE_VAR(SkewAroundCenter);
+ default:
+ break;
+ }
+
+#undef DO_CASE
+
+ return Matrix();
+}
+
+static Rect DispatchGetBounds(const PaintState& aState, uint32_t aOffset) {
+ if (aOffset >= aState.mCOLRLength) {
+ return Rect();
+ }
+
+ const char* paint = aState.COLRv1BaseAddr() + aOffset;
+ // All paint table formats start with an 8-bit 'format' field.
+ uint8_t format = uint8_t(*paint);
+
+#define DO_CASE(T) \
+ case T::kFormat: \
+ return aOffset + sizeof(T) <= aState.mCOLRLength \
+ ? reinterpret_cast<const T*>(paint)->GetBoundingRect(aState, \
+ aOffset) \
+ : Rect();
+
+ switch (format) {
+ DO_CASE(PaintColrLayers);
+ DO_CASE_VAR(Solid);
+ DO_CASE_VAR(LinearGradient);
+ DO_CASE_VAR(RadialGradient);
+ DO_CASE_VAR(SweepGradient);
+ DO_CASE(PaintGlyph);
+ DO_CASE(PaintColrGlyph);
+ DO_CASE_VAR(Transform);
+ DO_CASE_VAR(Translate);
+ DO_CASE_VAR(Scale);
+ DO_CASE_VAR(ScaleAroundCenter);
+ DO_CASE_VAR(ScaleUniform);
+ DO_CASE_VAR(ScaleUniformAroundCenter);
+ DO_CASE_VAR(Rotate);
+ DO_CASE_VAR(RotateAroundCenter);
+ DO_CASE_VAR(Skew);
+ DO_CASE_VAR(SkewAroundCenter);
+ DO_CASE(PaintComposite);
+ default:
+ break;
+ }
+
+#undef DO_CASE
+
+ return Rect();
+}
+
+#undef DO_CASE_VAR
+
+bool COLRHeader::Validate(uint64_t aLength) const {
+ uint64_t count;
+ if ((count = numBaseGlyphRecords)) {
+ if (baseGlyphRecordsOffset + count * sizeof(BaseGlyphRecord) > aLength) {
+ return false;
+ }
+ }
+ if ((count = numLayerRecords)) {
+ if (layerRecordsOffset + count * sizeof(LayerRecord) > aLength) {
+ return false;
+ }
+ }
+ // Check ordering of baseGlyphRecords, and that layer indices are in bounds.
+ int32_t lastGlyphId = -1;
+ const auto* baseGlyph = reinterpret_cast<const BaseGlyphRecord*>(
+ reinterpret_cast<const char*>(this) + baseGlyphRecordsOffset);
+ for (uint16_t i = 0; i < uint16_t(numBaseGlyphRecords); i++, baseGlyph++) {
+ uint16_t glyphId = baseGlyph->glyphId;
+ if (lastGlyphId >= int32_t(glyphId)) {
+ return false;
+ }
+ if (uint32_t(baseGlyph->firstLayerIndex) + uint32_t(baseGlyph->numLayers) >
+ uint32_t(numLayerRecords)) {
+ return false;
+ }
+ lastGlyphId = glyphId;
+ }
+ // We don't need to validate all the layer paletteEntryIndex fields here,
+ // because PaintState.GetColor will range-check them at paint time.
+ return true;
+}
+
+bool COLRv1Header::Validate(uint64_t aLength) const {
+ if (!base.Validate(aLength)) {
+ return false;
+ }
+ if (baseGlyphListOffset + sizeof(BaseGlyphList) > aLength ||
+ layerListOffset + sizeof(LayerList) > aLength ||
+ clipListOffset + sizeof(ClipList) > aLength ||
+ varIndexMapOffset + sizeof(DeltaSetIndexMap) > aLength ||
+ itemVariationStoreOffset + sizeof(ItemVariationStore) > aLength) {
+ return false;
+ }
+ const auto* b = baseGlyphList();
+ if (b && !b->Validate(this, aLength)) {
+ return false;
+ }
+ const auto* l = layerList();
+ if (l && !l->Validate(this, aLength)) {
+ return false;
+ }
+ const auto* c = clipList();
+ if (c && !c->Validate(this, aLength)) {
+ return false;
+ }
+ const auto* v = varIndexMap();
+ if (v && !v->Validate(this, aLength)) {
+ return false;
+ }
+ const auto* i = itemVariationStore();
+ if (i && !i->Validate(this, aLength)) {
+ return false;
+ }
+ return true;
+}
+
+bool BaseGlyphList::Validate(const COLRv1Header* aHeader,
+ uint64_t aLength) const {
+ uint64_t count = numBaseGlyphPaintRecords;
+ if (aHeader->baseGlyphListOffset + sizeof(BaseGlyphList) +
+ count * sizeof(BaseGlyphPaintRecord) >
+ aLength) {
+ return false;
+ }
+ // Check ordering of baseGlyphPaint records.
+ const auto* records = baseGlyphPaintRecords();
+ int32_t prevGlyphID = -1;
+ for (uint32_t i = 0; i < numBaseGlyphPaintRecords; ++i) {
+ const auto& base = records[i];
+ if (int32_t(uint16_t(base.glyphID)) <= prevGlyphID) {
+ return false;
+ }
+ prevGlyphID = base.glyphID;
+ }
+ return true;
+}
+
+bool LayerList::Validate(const COLRv1Header* aHeader, uint64_t aLength) const {
+ // Check that paintOffsets array fits.
+ uint64_t count = numLayers;
+ uint32_t listOffset = aHeader->layerListOffset;
+ if (listOffset + sizeof(LayerList) + count * sizeof(uint32) > aLength) {
+ return false;
+ }
+ // Check that values in paintOffsets are within bounds.
+ const auto* offsets = paintOffsets();
+ for (uint32_t i = 0; i < count; i++) {
+ if (listOffset + offsets[i] >= aLength) {
+ return false;
+ }
+ }
+ return true;
+}
+
+bool Clip::Validate(const COLRv1Header* aHeader, uint64_t aLength) const {
+ uint32_t offset = aHeader->clipListOffset + clipBoxOffset;
+ if (offset >= aLength) {
+ return false;
+ }
+ // ClipBox format begins with a 1-byte format field.
+ const uint8_t* box = reinterpret_cast<const uint8_t*>(aHeader) + offset;
+ switch (*box) {
+ case 1:
+ if (offset <= aLength - sizeof(ClipBoxFormat1)) {
+ return true;
+ }
+ break;
+ case 2:
+ if (offset <= aLength - sizeof(ClipBoxFormat2)) {
+ return true;
+ }
+ break;
+ default:
+ // unknown ClipBoxFormat
+ break;
+ }
+ return false;
+}
+
+bool ClipList::Validate(const COLRv1Header* aHeader, uint64_t aLength) const {
+ uint64_t count = numClips;
+ if (aHeader->clipListOffset + sizeof(ClipList) + count * sizeof(Clip) >
+ aLength) {
+ return false;
+ }
+ // Check ordering of clip records, and that they are within bounds.
+ const auto* clipArray = clips();
+ int32_t prevEnd = -1;
+ for (uint32_t i = 0; i < count; ++i) {
+ const auto& clip = clipArray[i];
+ if (int32_t(uint16_t(clip.startGlyphID)) <= prevEnd) {
+ return false;
+ }
+ if (!clip.Validate(aHeader, aLength)) {
+ return false;
+ }
+ prevEnd = uint16_t(clip.endGlyphID);
+ }
+ return true;
+}
+
+bool DeltaSetIndexMap::Validate(const COLRv1Header* aHeader,
+ uint64_t aLength) const {
+ uint64_t entrySize = ((entryFormat & MAP_ENTRY_SIZE_MASK) >> 4) + 1;
+ uint64_t mapCount;
+ uint64_t baseSize;
+ switch (format) {
+ case 0:
+ mapCount = uint32_t(v0.mapCount);
+ baseSize = 4;
+ break;
+ case 1:
+ mapCount = uint32_t(v1.mapCount);
+ baseSize = 6;
+ break;
+ default:
+ return false;
+ }
+ if (aHeader->varIndexMapOffset + baseSize + mapCount * entrySize > aLength) {
+ return false;
+ }
+ return true;
+}
+
+bool ItemVariationStore::Validate(const COLRv1Header* aHeader,
+ uint64_t aLength) const {
+ uint64_t offset = reinterpret_cast<const char*>(this) -
+ reinterpret_cast<const char*>(aHeader);
+ if (offset + variationRegionListOffset + sizeof(VariationRegionList) >
+ aLength) {
+ return false;
+ }
+ if (!variationRegionList()->Validate(aHeader, aLength)) {
+ return false;
+ }
+ uint16_t count = itemVariationDataCount;
+ if (offset + sizeof(ItemVariationStore) + count * sizeof(Offset32) >
+ aLength) {
+ return false;
+ }
+ const auto* ivdOffsets = itemVariationDataOffsets();
+ for (uint16_t i = 0; i < count; ++i) {
+ uint32_t o = ivdOffsets[i];
+ if (offset + o + sizeof(ItemVariationData) > aLength) {
+ return false;
+ }
+ const auto* variationData = reinterpret_cast<const ItemVariationData*>(
+ reinterpret_cast<const char*>(this) + ivdOffsets[i]);
+ if (!variationData->Validate(aHeader, aLength)) {
+ return false;
+ }
+ }
+ return true;
+}
+
+bool ItemVariationData::Validate(const COLRv1Header* aHeader,
+ uint64_t aLength) const {
+ if (reinterpret_cast<const char*>(regionIndexes() +
+ uint16_t(regionIndexCount)) >
+ reinterpret_cast<const char*>(aHeader) + aLength) {
+ return false;
+ }
+ uint16_t wordDeltaCount = this->wordDeltaCount;
+ bool longWords = wordDeltaCount & LONG_WORDS;
+ wordDeltaCount &= WORD_DELTA_COUNT_MASK;
+ uint32_t deltaSetSize =
+ (uint16_t(regionIndexCount) + uint16_t(wordDeltaCount)) << longWords;
+ if (reinterpret_cast<const char*>(deltaSets()) +
+ uint16_t(itemCount) * deltaSetSize >
+ reinterpret_cast<const char*>(aHeader) + aLength) {
+ return false;
+ }
+ return true;
+}
+
+} // end anonymous namespace
+
+namespace mozilla::gfx {
+
+bool COLRFonts::ValidateColorGlyphs(hb_blob_t* aCOLR, hb_blob_t* aCPAL) {
+ struct ColorRecord {
+ uint8_t blue;
+ uint8_t green;
+ uint8_t red;
+ uint8_t alpha;
+ };
+
+ struct CPALHeaderVersion0 {
+ uint16 version;
+ uint16 numPaletteEntries;
+ uint16 numPalettes;
+ uint16 numColorRecords;
+ Offset32 colorRecordsArrayOffset;
+ // uint16 colorRecordIndices[numPalettes];
+ const uint16* colorRecordIndices() const {
+ return reinterpret_cast<const uint16*>(this + 1);
+ }
+ };
+
+ unsigned int cpalLength;
+ const CPALHeaderVersion0* cpal = reinterpret_cast<const CPALHeaderVersion0*>(
+ hb_blob_get_data(aCPAL, &cpalLength));
+ if (!cpal || cpalLength < sizeof(CPALHeaderVersion0)) {
+ return false;
+ }
+
+ // We can handle either version 0 or 1.
+ if (uint16_t(cpal->version) > 1) {
+ return false;
+ }
+
+ uint16_t numPaletteEntries = cpal->numPaletteEntries;
+ uint16_t numPalettes = cpal->numPalettes;
+ uint16_t numColorRecords = cpal->numColorRecords;
+ uint32_t colorRecordsArrayOffset = cpal->colorRecordsArrayOffset;
+ const auto* indices = cpal->colorRecordIndices();
+ if (colorRecordsArrayOffset >= cpalLength) {
+ return false;
+ }
+ if (!numPaletteEntries || !numPalettes ||
+ numColorRecords < numPaletteEntries) {
+ return false;
+ }
+ if (sizeof(ColorRecord) * numColorRecords >
+ cpalLength - colorRecordsArrayOffset) {
+ return false;
+ }
+ if (sizeof(uint16) * numPalettes > cpalLength - sizeof(CPALHeaderVersion0)) {
+ return false;
+ }
+ for (uint16_t i = 0; i < numPalettes; ++i) {
+ uint32_t index = indices[i];
+ if (index + numPaletteEntries > numColorRecords) {
+ return false;
+ }
+ }
+
+ // The additional fields in CPALv1 are not checked here; the harfbuzz code
+ // handles reading them safely.
+
+ unsigned int colrLength;
+ const COLRHeader* colr =
+ reinterpret_cast<const COLRHeader*>(hb_blob_get_data(aCOLR, &colrLength));
+ if (!colr || colrLength < sizeof(COLRHeader)) {
+ return false;
+ }
+
+ if (uint16_t(colr->version) == 1) {
+ return StaticPrefs::gfx_font_rendering_colr_v1_enabled() &&
+ colrLength >= sizeof(COLRv1Header) &&
+ reinterpret_cast<const COLRv1Header*>(colr)->Validate(colrLength);
+ }
+
+ if (uint16_t(colr->version) != 0) {
+ // We only support version 1 (above) or version 0 headers.
+ return false;
+ }
+
+ return colr->Validate(colrLength);
+}
+
+const COLRFonts::GlyphLayers* COLRFonts::GetGlyphLayers(hb_blob_t* aCOLR,
+ uint32_t aGlyphId) {
+ unsigned int length;
+ const COLRHeader* colr =
+ reinterpret_cast<const COLRHeader*>(hb_blob_get_data(aCOLR, &length));
+ // This should never be called unless we have checked that the COLR table is
+ // structurally valid, so it will be safe to read the header fields.
+ MOZ_RELEASE_ASSERT(colr && length >= sizeof(COLRHeader), "bad COLR table!");
+ auto compareBaseGlyph = [](const void* key, const void* data) -> int {
+ uint32_t glyphId = (uint32_t)(uintptr_t)key;
+ const auto* baseGlyph = reinterpret_cast<const BaseGlyphRecord*>(data);
+ uint32_t baseGlyphId = uint16_t(baseGlyph->glyphId);
+ if (baseGlyphId == glyphId) {
+ return 0;
+ }
+ return baseGlyphId > glyphId ? -1 : 1;
+ };
+ return reinterpret_cast<const GlyphLayers*>(
+ bsearch((void*)(uintptr_t)aGlyphId, colr->GetBaseGlyphRecords(),
+ uint16_t(colr->numBaseGlyphRecords), sizeof(BaseGlyphRecord),
+ compareBaseGlyph));
+}
+
+bool COLRFonts::PaintGlyphLayers(
+ hb_blob_t* aCOLR, hb_face_t* aFace, const GlyphLayers* aLayers,
+ DrawTarget* aDrawTarget, layout::TextDrawTarget* aTextDrawer,
+ ScaledFont* aScaledFont, DrawOptions aDrawOptions, const Point& aPoint,
+ const sRGBColor& aCurrentColor, const nsTArray<sRGBColor>* aColors) {
+ const auto* glyphRecord = reinterpret_cast<const BaseGlyphRecord*>(aLayers);
+ // Default to opaque rendering (non-webrender applies alpha with a layer)
+ float alpha = 1.0;
+ if (aTextDrawer) {
+ // defaultColor is the one that comes from CSS, so it has transparency info.
+ bool hasComplexTransparency =
+ 0.0 < aCurrentColor.a && aCurrentColor.a < 1.0;
+ if (hasComplexTransparency && uint16_t(glyphRecord->numLayers) > 1) {
+ // WebRender doesn't support drawing multi-layer transparent color-glyphs,
+ // as it requires compositing all the layers before applying transparency.
+ // (pretend to succeed, output doesn't matter, we will emit a blob)
+ aTextDrawer->FoundUnsupportedFeature();
+ return true;
+ }
+
+ // If we get here, then either alpha is 0 or 1, or there's only one layer
+ // which shouldn't have composition issues. In all of these cases, applying
+ // transparency directly to the glyph should work perfectly fine.
+ //
+ // Note that we must still emit completely transparent emoji, because they
+ // might be wrapped in a shadow that uses the text run's glyphs.
+ alpha = aCurrentColor.a;
+ }
+
+ unsigned int length;
+ const COLRHeader* colr =
+ reinterpret_cast<const COLRHeader*>(hb_blob_get_data(aCOLR, &length));
+ PaintState state{{colr},
+ aColors->Elements(),
+ aDrawTarget,
+ aScaledFont,
+ nullptr, // variations not needed
+ aDrawOptions,
+ length,
+ aCurrentColor,
+ 0.0, // fontUnitsToPixels not needed
+ uint16_t(aColors->Length()),
+ 0,
+ nullptr};
+ return glyphRecord->Paint(state, alpha, aPoint);
+}
+
+const COLRFonts::GlyphPaintGraph* COLRFonts::GetGlyphPaintGraph(
+ hb_blob_t* aCOLR, uint32_t aGlyphId) {
+ if (!StaticPrefs::gfx_font_rendering_colr_v1_enabled()) {
+ return nullptr;
+ }
+ unsigned int blobLength;
+ const auto* colr =
+ reinterpret_cast<const COLRHeader*>(hb_blob_get_data(aCOLR, &blobLength));
+ MOZ_ASSERT(colr, "Cannot get COLR raw data");
+ MOZ_ASSERT(blobLength >= sizeof(COLRHeader), "COLR data too small");
+
+ uint16_t version = colr->version;
+ if (version == 1) {
+ MOZ_ASSERT(blobLength >= sizeof(COLRv1Header), "COLRv1 data too small");
+ const auto* colrv1 = reinterpret_cast<const COLRv1Header*>(colr);
+ return reinterpret_cast<const GlyphPaintGraph*>(
+ colrv1->GetBaseGlyphPaint(aGlyphId));
+ }
+
+ return nullptr;
+}
+
+bool COLRFonts::PaintGlyphGraph(
+ hb_blob_t* aCOLR, hb_font_t* aFont, const GlyphPaintGraph* aPaintGraph,
+ DrawTarget* aDrawTarget, layout::TextDrawTarget* aTextDrawer,
+ ScaledFont* aScaledFont, DrawOptions aDrawOptions, const Point& aPoint,
+ const sRGBColor& aCurrentColor, const nsTArray<sRGBColor>* aColors,
+ uint32_t aGlyphId, float aFontUnitsToPixels) {
+ if (aTextDrawer) {
+ // Currently we always punt to a blob for COLRv1 glyphs.
+ aTextDrawer->FoundUnsupportedFeature();
+ return true;
+ }
+
+ unsigned int coordCount;
+ const int* coords = hb_font_get_var_coords_normalized(aFont, &coordCount);
+
+ AutoTArray<uint32_t, 32> visitedOffsets;
+ PaintState state{{nullptr},
+ aColors->Elements(),
+ aDrawTarget,
+ aScaledFont,
+ coords,
+ aDrawOptions,
+ hb_blob_get_length(aCOLR),
+ aCurrentColor,
+ aFontUnitsToPixels,
+ uint16_t(aColors->Length()),
+ uint16_t(coordCount),
+ &visitedOffsets};
+ state.mHeader.v1 =
+ reinterpret_cast<const COLRv1Header*>(hb_blob_get_data(aCOLR, nullptr));
+ AutoRestoreTransform saveTransform(aDrawTarget);
+ aDrawTarget->ConcatTransform(Matrix::Translation(aPoint));
+ return PaintColrGlyph::DoPaint(
+ state, reinterpret_cast<const BaseGlyphPaintRecord*>(aPaintGraph),
+ aGlyphId, nullptr);
+}
+
+Rect COLRFonts::GetColorGlyphBounds(hb_blob_t* aCOLR, hb_font_t* aFont,
+ uint32_t aGlyphId, DrawTarget* aDrawTarget,
+ ScaledFont* aScaledFont,
+ float aFontUnitsToPixels) {
+ unsigned int coordCount;
+ const int* coords = hb_font_get_var_coords_normalized(aFont, &coordCount);
+
+ AutoTArray<uint32_t, 32> visitedOffsets;
+ PaintState state{{nullptr},
+ nullptr, // palette is not needed
+ aDrawTarget,
+ aScaledFont,
+ coords,
+ DrawOptions(),
+ hb_blob_get_length(aCOLR),
+ sRGBColor(),
+ aFontUnitsToPixels,
+ 0, // numPaletteEntries
+ uint16_t(coordCount),
+ &visitedOffsets};
+ state.mHeader.v1 =
+ reinterpret_cast<const COLRv1Header*>(hb_blob_get_data(aCOLR, nullptr));
+ MOZ_ASSERT(uint16_t(state.mHeader.v1->base.version) == 1);
+ // If a clip rect is provided, return this as the glyph bounds.
+ const auto* clipList = state.mHeader.v1->clipList();
+ if (clipList) {
+ const auto* clip = clipList->GetClip(aGlyphId);
+ if (clip) {
+ return clip->GetRect(state);
+ }
+ }
+ // Otherwise, compute bounds by walking the paint graph.
+ const auto* base = state.mHeader.v1->GetBaseGlyphPaint(aGlyphId);
+ if (base) {
+ return DispatchGetBounds(
+ state, state.mHeader.v1->baseGlyphListOffset + base->paintOffset);
+ }
+ return Rect();
+}
+
+uint16_t COLRFonts::GetColrTableVersion(hb_blob_t* aCOLR) {
+ unsigned int blobLength;
+ const auto* colr =
+ reinterpret_cast<const COLRHeader*>(hb_blob_get_data(aCOLR, &blobLength));
+ MOZ_ASSERT(colr, "Cannot get COLR raw data");
+ MOZ_ASSERT(blobLength >= sizeof(COLRHeader), "COLR data too small");
+ return colr->version;
+}
+
+nsTArray<sRGBColor> COLRFonts::CreateColorPalette(
+ hb_face_t* aFace, const FontPaletteValueSet* aPaletteValueSet,
+ nsAtom* aFontPalette, const nsACString& aFamilyName) {
+ // Find the base color palette to use, if there are multiple available;
+ // default to first in the font, if nothing matches what is requested.
+ unsigned int paletteIndex = 0;
+ unsigned int count = hb_ot_color_palette_get_count(aFace);
+ MOZ_ASSERT(count > 0, "No palettes? Font should have been rejected!");
+
+ const FontPaletteValueSet::PaletteValues* fpv = nullptr;
+ if (aFontPalette && aFontPalette != nsGkAtoms::normal &&
+ (count > 1 || aPaletteValueSet)) {
+ auto findPalette = [&](hb_ot_color_palette_flags_t flag) -> unsigned int {
+ MOZ_ASSERT(flag != HB_OT_COLOR_PALETTE_FLAG_DEFAULT);
+ for (unsigned int i = 0; i < count; ++i) {
+ if (hb_ot_color_palette_get_flags(aFace, i) & flag) {
+ return i;
+ }
+ }
+ return 0;
+ };
+
+ if (aFontPalette == nsGkAtoms::light) {
+ paletteIndex =
+ findPalette(HB_OT_COLOR_PALETTE_FLAG_USABLE_WITH_LIGHT_BACKGROUND);
+ } else if (aFontPalette == nsGkAtoms::dark) {
+ paletteIndex =
+ findPalette(HB_OT_COLOR_PALETTE_FLAG_USABLE_WITH_DARK_BACKGROUND);
+ } else {
+ if (aPaletteValueSet) {
+ if ((fpv = aPaletteValueSet->Lookup(aFontPalette, aFamilyName))) {
+ if (fpv->mBasePalette >= 0 && fpv->mBasePalette < int32_t(count)) {
+ paletteIndex = fpv->mBasePalette;
+ } else if (fpv->mBasePalette ==
+ FontPaletteValueSet::PaletteValues::kLight) {
+ paletteIndex = findPalette(
+ HB_OT_COLOR_PALETTE_FLAG_USABLE_WITH_LIGHT_BACKGROUND);
+ } else if (fpv->mBasePalette ==
+ FontPaletteValueSet::PaletteValues::kDark) {
+ paletteIndex = findPalette(
+ HB_OT_COLOR_PALETTE_FLAG_USABLE_WITH_DARK_BACKGROUND);
+ }
+ }
+ }
+ }
+ }
+
+ // Collect the palette colors and convert them to sRGBColor values.
+ count =
+ hb_ot_color_palette_get_colors(aFace, paletteIndex, 0, nullptr, nullptr);
+ nsTArray<hb_color_t> colors;
+ colors.SetLength(count);
+ hb_ot_color_palette_get_colors(aFace, paletteIndex, 0, &count,
+ colors.Elements());
+
+ nsTArray<sRGBColor> palette;
+ palette.SetCapacity(count);
+ for (const auto c : colors) {
+ palette.AppendElement(
+ sRGBColor(hb_color_get_red(c) / 255.0, hb_color_get_green(c) / 255.0,
+ hb_color_get_blue(c) / 255.0, hb_color_get_alpha(c) / 255.0));
+ }
+
+ // Apply @font-palette-values overrides, if present.
+ if (fpv) {
+ for (const auto overrideColor : fpv->mOverrides) {
+ if (overrideColor.mIndex < palette.Length()) {
+ palette[overrideColor.mIndex] = overrideColor.mColor;
+ }
+ }
+ }
+
+ return palette;
+}
+
+const FontPaletteValueSet::PaletteValues* FontPaletteValueSet::Lookup(
+ nsAtom* aName, const nsACString& aFamily) const {
+ nsAutoCString family(aFamily);
+ ToLowerCase(family);
+ if (const HashEntry* entry =
+ mValues.GetEntry(PaletteHashKey(aName, family))) {
+ return &entry->mValue;
+ }
+ return nullptr;
+}
+
+FontPaletteValueSet::PaletteValues* FontPaletteValueSet::Insert(
+ nsAtom* aName, const nsACString& aFamily) {
+ nsAutoCString family(aFamily);
+ ToLowerCase(family);
+ HashEntry* entry = mValues.PutEntry(PaletteHashKey(aName, family));
+ return &entry->mValue;
+}
+
+} // end namespace mozilla::gfx