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Diffstat (limited to 'gfx/skia/skia/src/core/SkBlitter.cpp')
| -rw-r--r-- | gfx/skia/skia/src/core/SkBlitter.cpp | 898 |
1 files changed, 898 insertions, 0 deletions
diff --git a/gfx/skia/skia/src/core/SkBlitter.cpp b/gfx/skia/skia/src/core/SkBlitter.cpp new file mode 100644 index 0000000000..e09886fcc9 --- /dev/null +++ b/gfx/skia/skia/src/core/SkBlitter.cpp @@ -0,0 +1,898 @@ +/* + * Copyright 2006 The Android Open Source Project + * + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#include "src/core/SkBlitter.h" + +#include "include/core/SkColor.h" +#include "include/core/SkColorFilter.h" +#include "include/core/SkString.h" +#include "include/private/SkColorData.h" +#include "include/private/base/SkTo.h" +#include "src/base/SkArenaAlloc.h" +#include "src/base/SkTLazy.h" +#include "src/core/SkAntiRun.h" +#include "src/core/SkMask.h" +#include "src/core/SkMaskFilterBase.h" +#include "src/core/SkMatrixProvider.h" +#include "src/core/SkOpts.h" +#include "src/core/SkPaintPriv.h" +#include "src/core/SkReadBuffer.h" +#include "src/core/SkRegionPriv.h" +#include "src/core/SkVMBlitter.h" +#include "src/core/SkWriteBuffer.h" +#include "src/core/SkXfermodeInterpretation.h" +#include "src/shaders/SkShaderBase.h" + +using namespace skia_private; + +// Hacks for testing. +bool gUseSkVMBlitter{false}; +bool gSkForceRasterPipelineBlitter{false}; + +SkBlitter::~SkBlitter() {} + +bool SkBlitter::isNullBlitter() const { return false; } + +const SkPixmap* SkBlitter::justAnOpaqueColor(uint32_t* value) { + return nullptr; +} + +/* +void SkBlitter::blitH(int x, int y, int width) { + SkDEBUGFAIL("unimplemented"); +} + + +void SkBlitter::blitAntiH(int x, int y, const SkAlpha antialias[], + const int16_t runs[]) { + SkDEBUGFAIL("unimplemented"); +} + */ + +inline static SkAlpha ScalarToAlpha(SkScalar a) { + SkAlpha alpha = (SkAlpha)(a * 255); + return alpha > 247 ? 0xFF : alpha < 8 ? 0 : alpha; +} + +void SkBlitter::blitFatAntiRect(const SkRect& rect) { + SkIRect bounds = rect.roundOut(); + SkASSERT(bounds.width() >= 3); + + // skbug.com/7813 + // To ensure consistency of the threaded backend (a rect that's considered fat in the init-once + // phase must also be considered fat in the draw phase), we have to deal with rects with small + // heights because the horizontal tiling in the threaded backend may change the height. + // + // This also implies that we cannot do vertical tiling unless we can blit any rect (not just the + // fat one.) + if (bounds.height() == 0) { + return; + } + + int runSize = bounds.width() + 1; // +1 so we can set runs[bounds.width()] = 0 + void* storage = this->allocBlitMemory(runSize * (sizeof(int16_t) + sizeof(SkAlpha))); + int16_t* runs = reinterpret_cast<int16_t*>(storage); + SkAlpha* alphas = reinterpret_cast<SkAlpha*>(runs + runSize); + + runs[0] = 1; + runs[1] = bounds.width() - 2; + runs[bounds.width() - 1] = 1; + runs[bounds.width()] = 0; + + SkScalar partialL = bounds.fLeft + 1 - rect.fLeft; + SkScalar partialR = rect.fRight - (bounds.fRight - 1); + SkScalar partialT = bounds.fTop + 1 - rect.fTop; + SkScalar partialB = rect.fBottom - (bounds.fBottom - 1); + + if (bounds.height() == 1) { + partialT = rect.fBottom - rect.fTop; + } + + alphas[0] = ScalarToAlpha(partialL * partialT); + alphas[1] = ScalarToAlpha(partialT); + alphas[bounds.width() - 1] = ScalarToAlpha(partialR * partialT); + this->blitAntiH(bounds.fLeft, bounds.fTop, alphas, runs); + + if (bounds.height() > 2) { + this->blitAntiRect(bounds.fLeft, bounds.fTop + 1, bounds.width() - 2, bounds.height() - 2, + ScalarToAlpha(partialL), ScalarToAlpha(partialR)); + } + + if (bounds.height() > 1) { + alphas[0] = ScalarToAlpha(partialL * partialB); + alphas[1] = ScalarToAlpha(partialB); + alphas[bounds.width() - 1] = ScalarToAlpha(partialR * partialB); + this->blitAntiH(bounds.fLeft, bounds.fBottom - 1, alphas, runs); + } +} + +void SkBlitter::blitV(int x, int y, int height, SkAlpha alpha) { + if (alpha == 255) { + this->blitRect(x, y, 1, height); + } else { + int16_t runs[2]; + runs[0] = 1; + runs[1] = 0; + + while (--height >= 0) { + this->blitAntiH(x, y++, &alpha, runs); + } + } +} + +void SkBlitter::blitRect(int x, int y, int width, int height) { + SkASSERT(width > 0); + while (--height >= 0) { + this->blitH(x, y++, width); + } +} + +/// Default implementation doesn't check for easy optimizations +/// such as alpha == 255; also uses blitV(), which some subclasses +/// may not support. +void SkBlitter::blitAntiRect(int x, int y, int width, int height, + SkAlpha leftAlpha, SkAlpha rightAlpha) { + if (leftAlpha > 0) { // we may send in x = -1 with leftAlpha = 0 + this->blitV(x, y, height, leftAlpha); + } + x++; + if (width > 0) { + this->blitRect(x, y, width, height); + x += width; + } + if (rightAlpha > 0) { + this->blitV(x, y, height, rightAlpha); + } +} + +////////////////////////////////////////////////////////////////////////////// + +static inline void bits_to_runs(SkBlitter* blitter, int x, int y, + const uint8_t bits[], + uint8_t left_mask, ptrdiff_t rowBytes, + uint8_t right_mask) { + int inFill = 0; + int pos = 0; + + while (--rowBytes >= 0) { + uint8_t b = *bits++ & left_mask; + if (rowBytes == 0) { + b &= right_mask; + } + + for (uint8_t test = 0x80U; test != 0; test >>= 1) { + if (b & test) { + if (!inFill) { + pos = x; + inFill = true; + } + } else { + if (inFill) { + blitter->blitH(pos, y, x - pos); + inFill = false; + } + } + x += 1; + } + left_mask = 0xFFU; + } + + // final cleanup + if (inFill) { + blitter->blitH(pos, y, x - pos); + } +} + +// maskBitCount is the number of 1's to place in the mask. It must be in the range between 1 and 8. +static uint8_t generate_right_mask(int maskBitCount) { + return static_cast<uint8_t>((0xFF00U >> maskBitCount) & 0xFF); +} + +void SkBlitter::blitMask(const SkMask& mask, const SkIRect& clip) { + SkASSERT(mask.fBounds.contains(clip)); + + if (mask.fFormat == SkMask::kLCD16_Format) { + return; // needs to be handled by subclass + } + + if (mask.fFormat == SkMask::kBW_Format) { + int cx = clip.fLeft; + int cy = clip.fTop; + int maskLeft = mask.fBounds.fLeft; + int maskRowBytes = mask.fRowBytes; + int height = clip.height(); + + const uint8_t* bits = mask.getAddr1(cx, cy); + + SkDEBUGCODE(const uint8_t* endOfImage = + mask.fImage + (mask.fBounds.height() - 1) * maskRowBytes + + ((mask.fBounds.width() + 7) >> 3)); + + if (cx == maskLeft && clip.fRight == mask.fBounds.fRight) { + while (--height >= 0) { + int affectedRightBit = mask.fBounds.width() - 1; + ptrdiff_t rowBytes = (affectedRightBit >> 3) + 1; + SkASSERT(bits + rowBytes <= endOfImage); + U8CPU rightMask = generate_right_mask((affectedRightBit & 7) + 1); + bits_to_runs(this, cx, cy, bits, 0xFF, rowBytes, rightMask); + bits += maskRowBytes; + cy += 1; + } + } else { + // Bits is calculated as the offset into the mask at the point {cx, cy} therefore, all + // addressing into the bit mask is relative to that point. Since this is an address + // calculated from a arbitrary bit in that byte, calculate the left most bit. + int bitsLeft = cx - ((cx - maskLeft) & 7); + + // Everything is relative to the bitsLeft. + int leftEdge = cx - bitsLeft; + SkASSERT(leftEdge >= 0); + int rightEdge = clip.fRight - bitsLeft; + SkASSERT(rightEdge > leftEdge); + + // Calculate left byte and mask + const uint8_t* leftByte = bits; + U8CPU leftMask = 0xFFU >> (leftEdge & 7); + + // Calculate right byte and mask + int affectedRightBit = rightEdge - 1; + const uint8_t* rightByte = bits + (affectedRightBit >> 3); + U8CPU rightMask = generate_right_mask((affectedRightBit & 7) + 1); + + // leftByte and rightByte are byte locations therefore, to get a count of bytes the + // code must add one. + ptrdiff_t rowBytes = rightByte - leftByte + 1; + + while (--height >= 0) { + SkASSERT(bits + rowBytes <= endOfImage); + bits_to_runs(this, bitsLeft, cy, bits, leftMask, rowBytes, rightMask); + bits += maskRowBytes; + cy += 1; + } + } + } else { + int width = clip.width(); + AutoSTMalloc<64, int16_t> runStorage(width + 1); + int16_t* runs = runStorage.get(); + const uint8_t* aa = mask.getAddr8(clip.fLeft, clip.fTop); + + SkOpts::memset16((uint16_t*)runs, 1, width); + runs[width] = 0; + + int height = clip.height(); + int y = clip.fTop; + while (--height >= 0) { + this->blitAntiH(clip.fLeft, y, aa, runs); + aa += mask.fRowBytes; + y += 1; + } + } +} + +/////////////////////// these are not virtual, just helpers + +#if defined(SK_SUPPORT_LEGACY_ALPHA_BITMAP_AS_COVERAGE) +void SkBlitter::blitMaskRegion(const SkMask& mask, const SkRegion& clip) { + if (clip.quickReject(mask.fBounds)) { + return; + } + + SkRegion::Cliperator clipper(clip, mask.fBounds); + + while (!clipper.done()) { + const SkIRect& cr = clipper.rect(); + this->blitMask(mask, cr); + clipper.next(); + } +} +#endif + +void SkBlitter::blitRectRegion(const SkIRect& rect, const SkRegion& clip) { + SkRegion::Cliperator clipper(clip, rect); + + while (!clipper.done()) { + const SkIRect& cr = clipper.rect(); + this->blitRect(cr.fLeft, cr.fTop, cr.width(), cr.height()); + clipper.next(); + } +} + +void SkBlitter::blitRegion(const SkRegion& clip) { + SkRegionPriv::VisitSpans(clip, [this](const SkIRect& r) { + this->blitRect(r.left(), r.top(), r.width(), r.height()); + }); +} + +/////////////////////////////////////////////////////////////////////////////// + +void SkNullBlitter::blitH(int x, int y, int width) {} + +void SkNullBlitter::blitAntiH(int x, int y, const SkAlpha antialias[], + const int16_t runs[]) {} + +void SkNullBlitter::blitV(int x, int y, int height, SkAlpha alpha) {} + +void SkNullBlitter::blitRect(int x, int y, int width, int height) {} + +void SkNullBlitter::blitMask(const SkMask& mask, const SkIRect& clip) {} + +const SkPixmap* SkNullBlitter::justAnOpaqueColor(uint32_t* value) { + return nullptr; +} + +bool SkNullBlitter::isNullBlitter() const { return true; } + +/////////////////////////////////////////////////////////////////////////////// + +static int compute_anti_width(const int16_t runs[]) { + int width = 0; + + for (;;) { + int count = runs[0]; + + SkASSERT(count >= 0); + if (count == 0) { + break; + } + width += count; + runs += count; + } + return width; +} + +static inline bool y_in_rect(int y, const SkIRect& rect) { + return (unsigned)(y - rect.fTop) < (unsigned)rect.height(); +} + +static inline bool x_in_rect(int x, const SkIRect& rect) { + return (unsigned)(x - rect.fLeft) < (unsigned)rect.width(); +} + +void SkRectClipBlitter::blitH(int left, int y, int width) { + SkASSERT(width > 0); + + if (!y_in_rect(y, fClipRect)) { + return; + } + + int right = left + width; + + if (left < fClipRect.fLeft) { + left = fClipRect.fLeft; + } + if (right > fClipRect.fRight) { + right = fClipRect.fRight; + } + + width = right - left; + if (width > 0) { + fBlitter->blitH(left, y, width); + } +} + +void SkRectClipBlitter::blitAntiH(int left, int y, const SkAlpha aa[], + const int16_t runs[]) { + if (!y_in_rect(y, fClipRect) || left >= fClipRect.fRight) { + return; + } + + int x0 = left; + int x1 = left + compute_anti_width(runs); + + if (x1 <= fClipRect.fLeft) { + return; + } + + SkASSERT(x0 < x1); + if (x0 < fClipRect.fLeft) { + int dx = fClipRect.fLeft - x0; + SkAlphaRuns::BreakAt((int16_t*)runs, (uint8_t*)aa, dx); + runs += dx; + aa += dx; + x0 = fClipRect.fLeft; + } + + SkASSERT(x0 < x1 && runs[x1 - x0] == 0); + if (x1 > fClipRect.fRight) { + x1 = fClipRect.fRight; + SkAlphaRuns::BreakAt((int16_t*)runs, (uint8_t*)aa, x1 - x0); + ((int16_t*)runs)[x1 - x0] = 0; + } + + SkASSERT(x0 < x1 && runs[x1 - x0] == 0); + SkASSERT(compute_anti_width(runs) == x1 - x0); + + fBlitter->blitAntiH(x0, y, aa, runs); +} + +void SkRectClipBlitter::blitV(int x, int y, int height, SkAlpha alpha) { + SkASSERT(height > 0); + + if (!x_in_rect(x, fClipRect)) { + return; + } + + int y0 = y; + int y1 = y + height; + + if (y0 < fClipRect.fTop) { + y0 = fClipRect.fTop; + } + if (y1 > fClipRect.fBottom) { + y1 = fClipRect.fBottom; + } + + if (y0 < y1) { + fBlitter->blitV(x, y0, y1 - y0, alpha); + } +} + +void SkRectClipBlitter::blitRect(int left, int y, int width, int height) { + SkIRect r; + + r.setLTRB(left, y, left + width, y + height); + if (r.intersect(fClipRect)) { + fBlitter->blitRect(r.fLeft, r.fTop, r.width(), r.height()); + } +} + +void SkRectClipBlitter::blitAntiRect(int left, int y, int width, int height, + SkAlpha leftAlpha, SkAlpha rightAlpha) { + SkIRect r; + + // The *true* width of the rectangle blitted is width+2: + r.setLTRB(left, y, left + width + 2, y + height); + if (r.intersect(fClipRect)) { + if (r.fLeft != left) { + SkASSERT(r.fLeft > left); + leftAlpha = 255; + } + if (r.fRight != left + width + 2) { + SkASSERT(r.fRight < left + width + 2); + rightAlpha = 255; + } + if (255 == leftAlpha && 255 == rightAlpha) { + fBlitter->blitRect(r.fLeft, r.fTop, r.width(), r.height()); + } else if (1 == r.width()) { + if (r.fLeft == left) { + fBlitter->blitV(r.fLeft, r.fTop, r.height(), leftAlpha); + } else { + SkASSERT(r.fLeft == left + width + 1); + fBlitter->blitV(r.fLeft, r.fTop, r.height(), rightAlpha); + } + } else { + fBlitter->blitAntiRect(r.fLeft, r.fTop, r.width() - 2, r.height(), + leftAlpha, rightAlpha); + } + } +} + +void SkRectClipBlitter::blitMask(const SkMask& mask, const SkIRect& clip) { + SkASSERT(mask.fBounds.contains(clip)); + + SkIRect r = clip; + + if (r.intersect(fClipRect)) { + fBlitter->blitMask(mask, r); + } +} + +const SkPixmap* SkRectClipBlitter::justAnOpaqueColor(uint32_t* value) { + return fBlitter->justAnOpaqueColor(value); +} + +/////////////////////////////////////////////////////////////////////////////// + +void SkRgnClipBlitter::blitH(int x, int y, int width) { + SkRegion::Spanerator span(*fRgn, y, x, x + width); + int left, right; + + while (span.next(&left, &right)) { + SkASSERT(left < right); + fBlitter->blitH(left, y, right - left); + } +} + +void SkRgnClipBlitter::blitAntiH(int x, int y, const SkAlpha aa[], + const int16_t runs[]) { + int width = compute_anti_width(runs); + SkRegion::Spanerator span(*fRgn, y, x, x + width); + int left, right; + SkDEBUGCODE(const SkIRect& bounds = fRgn->getBounds();) + + int prevRite = x; + while (span.next(&left, &right)) { + SkASSERT(x <= left); + SkASSERT(left < right); + SkASSERT(left >= bounds.fLeft && right <= bounds.fRight); + + SkAlphaRuns::Break((int16_t*)runs, (uint8_t*)aa, left - x, right - left); + + // now zero before left + if (left > prevRite) { + int index = prevRite - x; + ((uint8_t*)aa)[index] = 0; // skip runs after right + ((int16_t*)runs)[index] = SkToS16(left - prevRite); + } + + prevRite = right; + } + + if (prevRite > x) { + ((int16_t*)runs)[prevRite - x] = 0; + + if (x < 0) { + int skip = runs[0]; + SkASSERT(skip >= -x); + aa += skip; + runs += skip; + x += skip; + } + fBlitter->blitAntiH(x, y, aa, runs); + } +} + +void SkRgnClipBlitter::blitV(int x, int y, int height, SkAlpha alpha) { + SkIRect bounds; + bounds.setXYWH(x, y, 1, height); + + SkRegion::Cliperator iter(*fRgn, bounds); + + while (!iter.done()) { + const SkIRect& r = iter.rect(); + SkASSERT(bounds.contains(r)); + + fBlitter->blitV(x, r.fTop, r.height(), alpha); + iter.next(); + } +} + +void SkRgnClipBlitter::blitRect(int x, int y, int width, int height) { + SkIRect bounds; + bounds.setXYWH(x, y, width, height); + + SkRegion::Cliperator iter(*fRgn, bounds); + + while (!iter.done()) { + const SkIRect& r = iter.rect(); + SkASSERT(bounds.contains(r)); + + fBlitter->blitRect(r.fLeft, r.fTop, r.width(), r.height()); + iter.next(); + } +} + +void SkRgnClipBlitter::blitAntiRect(int x, int y, int width, int height, + SkAlpha leftAlpha, SkAlpha rightAlpha) { + // The *true* width of the rectangle to blit is width + 2 + SkIRect bounds; + bounds.setXYWH(x, y, width + 2, height); + + SkRegion::Cliperator iter(*fRgn, bounds); + + while (!iter.done()) { + const SkIRect& r = iter.rect(); + SkASSERT(bounds.contains(r)); + SkASSERT(r.fLeft >= x); + SkASSERT(r.fRight <= x + width + 2); + + SkAlpha effectiveLeftAlpha = (r.fLeft == x) ? leftAlpha : 255; + SkAlpha effectiveRightAlpha = (r.fRight == x + width + 2) ? + rightAlpha : 255; + + if (255 == effectiveLeftAlpha && 255 == effectiveRightAlpha) { + fBlitter->blitRect(r.fLeft, r.fTop, r.width(), r.height()); + } else if (1 == r.width()) { + if (r.fLeft == x) { + fBlitter->blitV(r.fLeft, r.fTop, r.height(), + effectiveLeftAlpha); + } else { + SkASSERT(r.fLeft == x + width + 1); + fBlitter->blitV(r.fLeft, r.fTop, r.height(), + effectiveRightAlpha); + } + } else { + fBlitter->blitAntiRect(r.fLeft, r.fTop, r.width() - 2, r.height(), + effectiveLeftAlpha, effectiveRightAlpha); + } + iter.next(); + } +} + + +void SkRgnClipBlitter::blitMask(const SkMask& mask, const SkIRect& clip) { + SkASSERT(mask.fBounds.contains(clip)); + + SkRegion::Cliperator iter(*fRgn, clip); + const SkIRect& r = iter.rect(); + SkBlitter* blitter = fBlitter; + + while (!iter.done()) { + blitter->blitMask(mask, r); + iter.next(); + } +} + +const SkPixmap* SkRgnClipBlitter::justAnOpaqueColor(uint32_t* value) { + return fBlitter->justAnOpaqueColor(value); +} + +/////////////////////////////////////////////////////////////////////////////// + +SkBlitter* SkBlitterClipper::apply(SkBlitter* blitter, const SkRegion* clip, + const SkIRect* ir) { + if (clip) { + const SkIRect& clipR = clip->getBounds(); + + if (clip->isEmpty() || (ir && !SkIRect::Intersects(clipR, *ir))) { + blitter = &fNullBlitter; + } else if (clip->isRect()) { + if (ir == nullptr || !clipR.contains(*ir)) { + fRectBlitter.init(blitter, clipR); + blitter = &fRectBlitter; + } + } else { + fRgnBlitter.init(blitter, clip); + blitter = &fRgnBlitter; + } + } + return blitter; +} + +/////////////////////////////////////////////////////////////////////////////// + +#include "src/core/SkCoreBlitters.h" + +bool SkBlitter::UseLegacyBlitter(const SkPixmap& device, + const SkPaint& paint, + const SkMatrix& matrix) { + if (gSkForceRasterPipelineBlitter || gUseSkVMBlitter) { + return false; + } +#if defined(SK_FORCE_RASTER_PIPELINE_BLITTER) + return false; +#else + + if (paint.isDither()) { + return false; + } + + const SkMaskFilterBase* mf = as_MFB(paint.getMaskFilter()); + const auto mode = paint.asBlendMode(); + + // The legacy blitters cannot handle any of these complex features (anymore). + if (device.alphaType() == kUnpremul_SkAlphaType || + !mode || + mode.value() > SkBlendMode::kLastCoeffMode || + (mf && mf->getFormat() == SkMask::k3D_Format)) { + return false; + } + + // All the real legacy fast paths are for shaders and SrcOver. + // Choosing SkRasterPipelineBlitter will also let us to hit its single-color memset path. + if (!paint.getShader() && mode != SkBlendMode::kSrcOver) { + return false; + } + + auto cs = device.colorSpace(); + // We check (indirectly via makeContext()) later on if the shader can handle the colorspace + // in legacy mode, so here we just focus on if a single color needs raster-pipeline. + if (cs && !paint.getShader()) { + if (!paint.getColor4f().fitsInBytes() || !cs->isSRGB()) { + return false; + } + } + + // Only kN32 is handled by legacy blitters now + return device.colorType() == kN32_SkColorType; +#endif +} + +SkBlitter* SkBlitter::Choose(const SkPixmap& device, + const SkMatrix& ctm, + const SkPaint& origPaint, + SkArenaAlloc* alloc, + bool drawCoverage, + sk_sp<SkShader> clipShader, + const SkSurfaceProps& props) { + SkASSERT(alloc); + + if (kUnknown_SkColorType == device.colorType()) { + return alloc->make<SkNullBlitter>(); + } + + // We may tweak the original paint as we go. + SkTCopyOnFirstWrite<SkPaint> paint(origPaint); + + if (auto mode = paint->asBlendMode()) { + // We have the most fast-paths for SrcOver, so see if we can act like SrcOver. + if (mode.value() != SkBlendMode::kSrcOver) { + switch (SkInterpretXfermode(*paint, SkColorTypeIsAlwaysOpaque(device.colorType()))) { + case kSrcOver_SkXfermodeInterpretation: + paint.writable()->setBlendMode(SkBlendMode::kSrcOver); + break; + case kSkipDrawing_SkXfermodeInterpretation: + return alloc->make<SkNullBlitter>(); + default: + break; + } + } + + // A Clear blend mode will ignore the entire color pipeline, as if Src mode with 0x00000000. + if (mode.value() == SkBlendMode::kClear) { + SkPaint* p = paint.writable(); + p->setShader(nullptr); + p->setColorFilter(nullptr); + p->setBlendMode(SkBlendMode::kSrc); + p->setColor(0x00000000); + } + } + + if (paint->getColorFilter()) { + SkPaintPriv::RemoveColorFilter(paint.writable(), device.colorSpace()); + } + SkASSERT(!paint->getColorFilter()); + + if (drawCoverage) { + if (device.colorType() == kAlpha_8_SkColorType) { + SkASSERT(!paint->getShader()); + SkASSERT(paint->isSrcOver()); + return alloc->make<SkA8_Coverage_Blitter>(device, *paint); + } + return alloc->make<SkNullBlitter>(); + } + + if (paint->isDither() && !SkPaintPriv::ShouldDither(*paint, device.colorType())) { + paint.writable()->setDither(false); + } + + // Same basic idea used a few times: try SkRP, then try SkVM, then give up with a null-blitter. + // (Setting gUseSkVMBlitter is the only way we prefer SkVM over SkRP at the moment.) + auto create_SkRP_or_SkVMBlitter = [&]() -> SkBlitter* { + + // We need to make sure that in case RP blitter cannot be created we use VM and + // when VM blitter cannot be created we use RP + if (gUseSkVMBlitter) { + if (auto blitter = SkVMBlitter::Make(device, *paint, ctm, alloc, clipShader)) { + return blitter; + } + } + if (auto blitter = SkCreateRasterPipelineBlitter(device, + *paint, + ctm, + alloc, + clipShader, + props)) { + return blitter; + } + if (!gUseSkVMBlitter) { + if (auto blitter = SkVMBlitter::Make(device, *paint, ctm, alloc, clipShader)) { + return blitter; + } + } + return alloc->make<SkNullBlitter>(); + }; + + // We'll end here for many interesting cases: color spaces, color filters, most color types. + if (clipShader || !UseLegacyBlitter(device, *paint, ctm)) { + return create_SkRP_or_SkVMBlitter(); + } + + // Everything but legacy kN32_SkColorType should already be handled. + SkASSERT(device.colorType() == kN32_SkColorType); + + // And we should either have a shader, be blending with SrcOver, or both. + SkASSERT(paint->getShader() || paint->asBlendMode() == SkBlendMode::kSrcOver); + + // Legacy blitters keep their shader state on a shader context. + SkShaderBase::Context* shaderContext = nullptr; + if (paint->getShader()) { + shaderContext = as_SB(paint->getShader())->makeContext( + {paint->getColor4f(), ctm, nullptr, device.colorType(), device.colorSpace(), props}, + alloc); + + // Creating the context isn't always possible... try fallbacks before giving up. + if (!shaderContext) { + return create_SkRP_or_SkVMBlitter(); + } + } + + switch (device.colorType()) { + case kN32_SkColorType: + if (shaderContext) { + return alloc->make<SkARGB32_Shader_Blitter>(device, *paint, shaderContext); + } else if (paint->getColor() == SK_ColorBLACK) { + return alloc->make<SkARGB32_Black_Blitter>(device, *paint); + } else if (paint->getAlpha() == 0xFF) { + return alloc->make<SkARGB32_Opaque_Blitter>(device, *paint); + } else { + return alloc->make<SkARGB32_Blitter>(device, *paint); + } + + default: + SkASSERT(false); + return alloc->make<SkNullBlitter>(); + } +} + +/////////////////////////////////////////////////////////////////////////////// + +SkShaderBlitter::SkShaderBlitter(const SkPixmap& device, const SkPaint& paint, + SkShaderBase::Context* shaderContext) + : INHERITED(device) + , fShader(paint.getShader()) + , fShaderContext(shaderContext) { + SkASSERT(fShader); + SkASSERT(fShaderContext); + + fShader->ref(); + fShaderFlags = fShaderContext->getFlags(); + fConstInY = SkToBool(fShaderFlags & SkShaderBase::kConstInY32_Flag); +} + +SkShaderBlitter::~SkShaderBlitter() { + fShader->unref(); +} + +/////////////////////////////////////////////////////////////////////////////////////////////////// + +#ifdef SK_DEBUG + +void SkRectClipCheckBlitter::blitH(int x, int y, int width) { + SkASSERT(fClipRect.contains(SkIRect::MakeXYWH(x, y, width, 1))); + fBlitter->blitH(x, y, width); +} + +void SkRectClipCheckBlitter::blitAntiH(int x, int y, const SkAlpha aa[], const int16_t runs[]) { + const int16_t* iter = runs; + for (; *iter; iter += *iter) + ; + int width = iter - runs; + SkASSERT(fClipRect.contains(SkIRect::MakeXYWH(x, y, width, 1))); + fBlitter->blitAntiH(x, y, aa, runs); +} + +void SkRectClipCheckBlitter::blitV(int x, int y, int height, SkAlpha alpha) { + SkASSERT(fClipRect.contains(SkIRect::MakeXYWH(x, y, 1, height))); + fBlitter->blitV(x, y, height, alpha); +} + +void SkRectClipCheckBlitter::blitRect(int x, int y, int width, int height) { + SkASSERT(fClipRect.contains(SkIRect::MakeXYWH(x, y, width, height))); + fBlitter->blitRect(x, y, width, height); +} + +void SkRectClipCheckBlitter::blitAntiRect(int x, int y, int width, int height, + SkAlpha leftAlpha, SkAlpha rightAlpha) { + bool skipLeft = !leftAlpha; + bool skipRight = !rightAlpha; + SkIRect r = SkIRect::MakeXYWH(x + skipLeft, y, width + 2 - skipRight - skipLeft, height); + SkASSERT(r.isEmpty() || fClipRect.contains(r)); + fBlitter->blitAntiRect(x, y, width, height, leftAlpha, rightAlpha); +} + +void SkRectClipCheckBlitter::blitMask(const SkMask& mask, const SkIRect& clip) { + SkASSERT(mask.fBounds.contains(clip)); + SkASSERT(fClipRect.contains(clip)); + fBlitter->blitMask(mask, clip); +} + +const SkPixmap* SkRectClipCheckBlitter::justAnOpaqueColor(uint32_t* value) { + return fBlitter->justAnOpaqueColor(value); +} + +void SkRectClipCheckBlitter::blitAntiH2(int x, int y, U8CPU a0, U8CPU a1) { + SkASSERT(fClipRect.contains(SkIRect::MakeXYWH(x, y, 2, 1))); + fBlitter->blitAntiH2(x, y, a0, a1); +} + +void SkRectClipCheckBlitter::blitAntiV2(int x, int y, U8CPU a0, U8CPU a1) { + SkASSERT(fClipRect.contains(SkIRect::MakeXYWH(x, y, 1, 2))); + fBlitter->blitAntiV2(x, y, a0, a1); +} + +#endif |