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| -rw-r--r-- | vcl/skia/gdiimpl.cxx | 2182 |
1 files changed, 2182 insertions, 0 deletions
diff --git a/vcl/skia/gdiimpl.cxx b/vcl/skia/gdiimpl.cxx new file mode 100644 index 000000000..896849bae --- /dev/null +++ b/vcl/skia/gdiimpl.cxx @@ -0,0 +1,2182 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * 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/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +#include <skia/gdiimpl.hxx> + +#include <salgdi.hxx> +#include <skia/salbmp.hxx> +#include <vcl/idle.hxx> +#include <vcl/svapp.hxx> +#include <vcl/lazydelete.hxx> +#include <vcl/gradient.hxx> +#include <vcl/skia/SkiaHelper.hxx> +#include <skia/utils.hxx> +#include <skia/zone.hxx> + +#include <SkBitmap.h> +#include <SkCanvas.h> +#include <SkGradientShader.h> +#include <SkPath.h> +#include <SkRegion.h> +#include <SkDashPathEffect.h> +#include <GrBackendSurface.h> +#include <SkTextBlob.h> +#include <SkRSXform.h> + +#include <numeric> +#include <basegfx/polygon/b2dpolygontools.hxx> +#include <basegfx/polygon/b2dpolypolygontools.hxx> +#include <basegfx/polygon/b2dpolypolygoncutter.hxx> +#include <o3tl/sorted_vector.hxx> +#include <rtl/math.hxx> + +using namespace SkiaHelper; + +namespace +{ +// Create Skia Path from B2DPolygon +// Note that polygons generally have the complication that when used +// for area (fill) operations they usually miss the right-most and +// bottom-most line of pixels of the bounding rectangle (see +// https://lists.freedesktop.org/archives/libreoffice/2019-November/083709.html). +// So be careful with rectangle->polygon conversions (generally avoid them). +void addPolygonToPath(const basegfx::B2DPolygon& rPolygon, SkPath& rPath, sal_uInt32 nFirstIndex, + sal_uInt32 nLastIndex, const sal_uInt32 nPointCount, const bool bClosePath, + const bool bHasCurves, bool* hasOnlyOrthogonal = nullptr) +{ + assert(nFirstIndex < nPointCount); + assert(nLastIndex <= nPointCount); + + if (nPointCount <= 1) + return; + + bool bFirst = true; + sal_uInt32 nPreviousIndex = nFirstIndex == 0 ? nPointCount - 1 : nFirstIndex - 1; + basegfx::B2DPoint aPreviousPoint = rPolygon.getB2DPoint(nPreviousIndex); + + for (sal_uInt32 nIndex = nFirstIndex; nIndex <= nLastIndex; nIndex++) + { + if (nIndex == nPointCount && !bClosePath) + continue; + + // Make sure we loop the last point to first point + sal_uInt32 nCurrentIndex = nIndex % nPointCount; + basegfx::B2DPoint aCurrentPoint = rPolygon.getB2DPoint(nCurrentIndex); + + if (bFirst) + { + rPath.moveTo(aCurrentPoint.getX(), aCurrentPoint.getY()); + bFirst = false; + } + else if (!bHasCurves) + { + rPath.lineTo(aCurrentPoint.getX(), aCurrentPoint.getY()); + // If asked for, check whether the polygon has a line that is not + // strictly horizontal or vertical. + if (hasOnlyOrthogonal != nullptr && aCurrentPoint.getX() != aPreviousPoint.getX() + && aCurrentPoint.getY() != aPreviousPoint.getY()) + *hasOnlyOrthogonal = false; + } + else + { + basegfx::B2DPoint aPreviousControlPoint = rPolygon.getNextControlPoint(nPreviousIndex); + basegfx::B2DPoint aCurrentControlPoint = rPolygon.getPrevControlPoint(nCurrentIndex); + + if (aPreviousControlPoint.equal(aPreviousPoint) + && aCurrentControlPoint.equal(aCurrentPoint)) + { + rPath.lineTo(aCurrentPoint.getX(), aCurrentPoint.getY()); // a straight line + if (hasOnlyOrthogonal != nullptr && aCurrentPoint.getX() != aPreviousPoint.getX() + && aCurrentPoint.getY() != aPreviousPoint.getY()) + *hasOnlyOrthogonal = false; + } + else + { + if (aPreviousControlPoint.equal(aPreviousPoint)) + { + aPreviousControlPoint + = aPreviousPoint + ((aPreviousControlPoint - aCurrentPoint) * 0.0005); + } + if (aCurrentControlPoint.equal(aCurrentPoint)) + { + aCurrentControlPoint + = aCurrentPoint + ((aCurrentControlPoint - aPreviousPoint) * 0.0005); + } + rPath.cubicTo(aPreviousControlPoint.getX(), aPreviousControlPoint.getY(), + aCurrentControlPoint.getX(), aCurrentControlPoint.getY(), + aCurrentPoint.getX(), aCurrentPoint.getY()); + if (hasOnlyOrthogonal != nullptr) + *hasOnlyOrthogonal = false; + } + } + aPreviousPoint = aCurrentPoint; + nPreviousIndex = nCurrentIndex; + } + if (bClosePath && nFirstIndex == 0 && nLastIndex == nPointCount) + { + rPath.close(); + } +} + +void addPolygonToPath(const basegfx::B2DPolygon& rPolygon, SkPath& rPath, + bool* hasOnlyOrthogonal = nullptr) +{ + addPolygonToPath(rPolygon, rPath, 0, rPolygon.count(), rPolygon.count(), rPolygon.isClosed(), + rPolygon.areControlPointsUsed(), hasOnlyOrthogonal); +} + +void addPolyPolygonToPath(const basegfx::B2DPolyPolygon& rPolyPolygon, SkPath& rPath, + bool* hasOnlyOrthogonal = nullptr) +{ + const sal_uInt32 nPolygonCount(rPolyPolygon.count()); + + if (nPolygonCount == 0) + return; + + sal_uInt32 nPointCount = 0; + for (const auto& rPolygon : rPolyPolygon) + nPointCount += rPolygon.count() * 3; // because cubicTo is 3 elements + rPath.incReserve(nPointCount); + + for (const auto& rPolygon : rPolyPolygon) + { + addPolygonToPath(rPolygon, rPath, hasOnlyOrthogonal); + } +} + +// Check if the given polygon contains a straight line. If not, it consists +// solely of curves. +bool polygonContainsLine(const basegfx::B2DPolyPolygon& rPolyPolygon) +{ + if (!rPolyPolygon.areControlPointsUsed()) + return true; // no curves at all + for (const auto& rPolygon : rPolyPolygon) + { + const sal_uInt32 nPointCount(rPolygon.count()); + bool bFirst = true; + + const bool bClosePath(rPolygon.isClosed()); + + sal_uInt32 nCurrentIndex = 0; + sal_uInt32 nPreviousIndex = nPointCount - 1; + + basegfx::B2DPoint aCurrentPoint; + basegfx::B2DPoint aPreviousPoint; + + for (sal_uInt32 nIndex = 0; nIndex <= nPointCount; nIndex++) + { + if (nIndex == nPointCount && !bClosePath) + continue; + + // Make sure we loop the last point to first point + nCurrentIndex = nIndex % nPointCount; + if (bFirst) + bFirst = false; + else + { + basegfx::B2DPoint aPreviousControlPoint + = rPolygon.getNextControlPoint(nPreviousIndex); + basegfx::B2DPoint aCurrentControlPoint + = rPolygon.getPrevControlPoint(nCurrentIndex); + + if (aPreviousControlPoint.equal(aPreviousPoint) + && aCurrentControlPoint.equal(aCurrentPoint)) + { + return true; // found a straight line + } + } + aPreviousPoint = aCurrentPoint; + nPreviousIndex = nCurrentIndex; + } + } + return false; // no straight line found +} + +// returns true if the source or destination rectangles are invalid +bool checkInvalidSourceOrDestination(SalTwoRect const& rPosAry) +{ + return rPosAry.mnSrcWidth <= 0 || rPosAry.mnSrcHeight <= 0 || rPosAry.mnDestWidth <= 0 + || rPosAry.mnDestHeight <= 0; +} + +} // end anonymous namespace + +// Class that triggers flushing the backing buffer when idle. +class SkiaFlushIdle : public Idle +{ + SkiaSalGraphicsImpl* mpGraphics; +#ifndef NDEBUG + char* debugname; +#endif + +public: + explicit SkiaFlushIdle(SkiaSalGraphicsImpl* pGraphics) + : Idle(get_debug_name(pGraphics)) + , mpGraphics(pGraphics) + { + // We don't want to be swapping before we've painted. + SetPriority(TaskPriority::POST_PAINT); + } +#ifndef NDEBUG + virtual ~SkiaFlushIdle() { free(debugname); } +#endif + const char* get_debug_name(SkiaSalGraphicsImpl* pGraphics) + { +#ifndef NDEBUG + // Idle keeps just a pointer, so we need to store the string + debugname = strdup( + OString("skia idle 0x" + OString::number(reinterpret_cast<sal_uIntPtr>(pGraphics), 16)) + .getStr()); + return debugname; +#else + (void)pGraphics; + return "skia idle"; +#endif + } + + virtual void Invoke() override + { + mpGraphics->performFlush(); + Stop(); + SetPriority(TaskPriority::HIGHEST); + } +}; + +SkiaSalGraphicsImpl::SkiaSalGraphicsImpl(SalGraphics& rParent, SalGeometryProvider* pProvider) + : mParent(rParent) + , mProvider(pProvider) + , mIsGPU(false) + , mLineColor(SALCOLOR_NONE) + , mFillColor(SALCOLOR_NONE) + , mXorMode(XorMode::None) + , mFlush(new SkiaFlushIdle(this)) + , mScaling(1) +{ +} + +SkiaSalGraphicsImpl::~SkiaSalGraphicsImpl() +{ + assert(!mSurface); + assert(!mWindowContext); +} + +void SkiaSalGraphicsImpl::Init() {} + +void SkiaSalGraphicsImpl::createSurface() +{ + SkiaZone zone; + if (isOffscreen()) + createOffscreenSurface(); + else + createWindowSurface(); + mClipRegion = vcl::Region(tools::Rectangle(0, 0, GetWidth(), GetHeight())); + mDirtyRect = SkIRect::MakeWH(GetWidth(), GetHeight()); + setCanvasScalingAndClipping(); + + // We don't want to be swapping before we've painted. + mFlush->Stop(); + mFlush->SetPriority(TaskPriority::POST_PAINT); +} + +void SkiaSalGraphicsImpl::createWindowSurface(bool forceRaster) +{ + SkiaZone zone; + assert(!isOffscreen()); + assert(!mSurface); + createWindowSurfaceInternal(forceRaster); + if (!mSurface) + { + switch (forceRaster ? RenderRaster : renderMethodToUse()) + { + case RenderVulkan: + SAL_WARN("vcl.skia", + "cannot create Vulkan GPU window surface, falling back to Raster"); + destroySurface(); // destroys also WindowContext + return createWindowSurface(true); // try again + case RenderMetal: + SAL_WARN("vcl.skia", + "cannot create Metal GPU window surface, falling back to Raster"); + destroySurface(); // destroys also WindowContext + return createWindowSurface(true); // try again + case RenderRaster: + abort(); // This should not really happen, do not even try to cope with it. + } + } + mIsGPU = mSurface->getCanvas()->recordingContext() != nullptr; +#ifdef DBG_UTIL + prefillSurface(mSurface); +#endif +} + +bool SkiaSalGraphicsImpl::isOffscreen() const +{ + if (mProvider == nullptr || mProvider->IsOffScreen()) + return true; + // HACK: Sometimes (tdf#131939, tdf#138022, tdf#140288) VCL passes us a zero-sized window, + // and zero size is invalid for Skia, so force offscreen surface, where we handle this. + if (GetWidth() <= 0 || GetHeight() <= 0) + return true; + return false; +} + +void SkiaSalGraphicsImpl::createOffscreenSurface() +{ + SkiaZone zone; + assert(isOffscreen()); + assert(!mSurface); + // HACK: See isOffscreen(). + int width = std::max(1, GetWidth()); + int height = std::max(1, GetHeight()); + // We need to use window scaling even for offscreen surfaces, because the common usage is rendering something + // into an offscreen surface and then copy it to a window, so without scaling here the result would be originally + // drawn without scaling and only upscaled when drawing to a window. + mScaling = getWindowScaling(); + mSurface = createSkSurface(width * mScaling, height * mScaling); + assert(mSurface); + mIsGPU = mSurface->getCanvas()->recordingContext() != nullptr; +} + +void SkiaSalGraphicsImpl::destroySurface() +{ + SkiaZone zone; + if (mSurface) + { + // check setClipRegion() invariant + assert(mSurface->getCanvas()->getSaveCount() == 3); + // if this fails, something forgot to use SkAutoCanvasRestore + assert(mSurface->getCanvas()->getTotalMatrix() == SkMatrix::Scale(mScaling, mScaling)); + } + mSurface.reset(); + mWindowContext.reset(); + mIsGPU = false; + mScaling = 1; +} + +void SkiaSalGraphicsImpl::performFlush() +{ + SkiaZone zone; + flushDrawing(); + if (mSurface) + { + if (mDirtyRect.intersect(SkIRect::MakeWH(GetWidth(), GetHeight()))) + flushSurfaceToWindowContext(); + mDirtyRect.setEmpty(); + } +} + +void SkiaSalGraphicsImpl::flushSurfaceToWindowContext() +{ + sk_sp<SkSurface> screenSurface = mWindowContext->getBackbufferSurface(); + if (screenSurface != mSurface) + { + // GPU-based window contexts require calling getBackbufferSurface() + // for every swapBuffers(), for this reason mSurface is an offscreen surface + // where we keep the contents (LO does not do full redraws). + // So here blit the surface to the window context surface and then swap it. + assert(isGPU()); // Raster should always draw directly to backbuffer to save copying + SkPaint paint; + paint.setBlendMode(SkBlendMode::kSrc); // copy as is + // We ignore mDirtyRect here, and mSurface already is in screenSurface coordinates, + // so no transformation needed. + screenSurface->getCanvas()->drawImage(makeCheckedImageSnapshot(mSurface), 0, 0, + SkSamplingOptions(), &paint); + screenSurface->flushAndSubmit(); // Otherwise the window is not drawn sometimes. + mWindowContext->swapBuffers(nullptr); // Must swap the entire surface. + } + else + { + // For raster mode use directly the backbuffer surface, it's just a bitmap + // surface anyway, and for those there's no real requirement to call + // getBackbufferSurface() repeatedly. Using our own surface would duplicate + // memory and cost time copying pixels around. + assert(!isGPU()); + SkIRect dirtyRect = mDirtyRect; + if (mScaling != 1) // Adjust to mSurface coordinates if needed. + dirtyRect = scaleRect(dirtyRect, mScaling); + mWindowContext->swapBuffers(&dirtyRect); + } +} + +void SkiaSalGraphicsImpl::DeInit() { destroySurface(); } + +void SkiaSalGraphicsImpl::preDraw() +{ + assert(comphelper::SolarMutex::get()->IsCurrentThread()); + SkiaZone::enter(); // matched in postDraw() + checkSurface(); + checkPendingDrawing(); +} + +void SkiaSalGraphicsImpl::postDraw() +{ + scheduleFlush(); + // Skia (at least when using Vulkan) queues drawing commands and executes them only later. + // But tdf#136369 leads to creating and queueing many tiny bitmaps, which makes + // Skia slow, and may make it even run out of memory. So force a flush if such + // a problematic operation has been performed too many times without a flush. + // Note that the counter is a static variable, as all drawing shares the same Skia drawing + // context (and so the flush here will also flush all drawing). + if (pendingOperationsToFlush > 1000) + { + mSurface->flushAndSubmit(); + pendingOperationsToFlush = 0; + } + SkiaZone::leave(); // matched in preDraw() + // If there's a problem with the GPU context, abort. + if (GrDirectContext* context = GrAsDirectContext(mSurface->getCanvas()->recordingContext())) + { + // Running out of memory on the GPU technically could be possibly recoverable, + // but we don't know the exact status of the surface (and what has or has not been drawn to it), + // so in practice this is unrecoverable without possible data loss. + if (context->oomed()) + { + SAL_WARN("vcl.skia", "GPU context has run out of memory, aborting."); + abort(); + } + // Unrecoverable problem. + if (context->abandoned()) + { + SAL_WARN("vcl.skia", "GPU context has been abandoned, aborting."); + abort(); + } + } +} + +void SkiaSalGraphicsImpl::scheduleFlush() +{ + if (!isOffscreen()) + { + if (!Application::IsInExecute()) + performFlush(); // otherwise nothing would trigger idle rendering + else if (!mFlush->IsActive()) + mFlush->Start(); + } +} + +// VCL can sometimes resize us without telling us, update the surface if needed. +// Also create the surface on demand if it has not been created yet (it is a waste +// to create it in Init() if it gets recreated later anyway). +void SkiaSalGraphicsImpl::checkSurface() +{ + if (!mSurface) + { + createSurface(); + SAL_INFO("vcl.skia.trace", + "create(" << this << "): " << Size(mSurface->width(), mSurface->height())); + } + else if (GetWidth() * mScaling != mSurface->width() + || GetHeight() * mScaling != mSurface->height()) + { + if (!avoidRecreateByResize()) + { + Size oldSize(mSurface->width(), mSurface->height()); + // Recreating a surface means that the old SkSurface contents will be lost. + // But if a window has been resized the windowing system may send repaint events + // only for changed parts and VCL would not repaint the whole area, assuming + // that some parts have not changed (this is what seems to cause tdf#131952). + // So carry over the old contents for windows, even though generally everything + // will be usually repainted anyway. + sk_sp<SkImage> snapshot; + if (!isOffscreen()) + { + flushDrawing(); + snapshot = makeCheckedImageSnapshot(mSurface); + } + + destroySurface(); + createSurface(); + + if (snapshot) + { + SkPaint paint; + paint.setBlendMode(SkBlendMode::kSrc); // copy as is + // Scaling by current mScaling is active, undo that. We assume that the scaling + // does not change. + resetCanvasScalingAndClipping(); + mSurface->getCanvas()->drawImage(snapshot, 0, 0, SkSamplingOptions(), &paint); + setCanvasScalingAndClipping(); + } + SAL_INFO("vcl.skia.trace", "recreate(" << this << "): old " << oldSize << " new " + << Size(mSurface->width(), mSurface->height()) + << " requested " + << Size(GetWidth(), GetHeight())); + } + } +} + +bool SkiaSalGraphicsImpl::avoidRecreateByResize() const +{ + // Keep the old surface if VCL sends us a broken size (see isOffscreen()). + if (GetWidth() == 0 || GetHeight() == 0) + return true; + return false; +} + +void SkiaSalGraphicsImpl::flushDrawing() +{ + if (!mSurface) + return; + checkPendingDrawing(); + ++pendingOperationsToFlush; +} + +void SkiaSalGraphicsImpl::setCanvasScalingAndClipping() +{ + SkCanvas* canvas = mSurface->getCanvas(); + assert(canvas->getSaveCount() == 1); + // If HiDPI scaling is active, simply set a scaling matrix for the canvas. This means + // that all painting can use VCL coordinates and they'll be automatically translated to mSurface + // scaled coordinates. If that is not wanted, the scale() state needs to be temporarily unset. + // State such as mDirtyRect is not scaled, the scaling matrix applies to clipping too, + // and the rest needs to be handled explicitly. + // When reading mSurface contents there's no automatic scaling and it needs to be handled explicitly. + canvas->save(); // keep the original state without any scaling + canvas->scale(mScaling, mScaling); + + // SkCanvas::clipRegion() can only further reduce the clip region, + // but we need to set the given region, which may extend it. + // So handle that by always having the full clip region saved on the stack + // and always go back to that. SkCanvas::restore() only affects the clip + // and the matrix. + canvas->save(); // keep scaled state without clipping + setCanvasClipRegion(canvas, mClipRegion); +} + +void SkiaSalGraphicsImpl::resetCanvasScalingAndClipping() +{ + SkCanvas* canvas = mSurface->getCanvas(); + assert(canvas->getSaveCount() == 3); + canvas->restore(); // undo clipping + canvas->restore(); // undo scaling +} + +bool SkiaSalGraphicsImpl::setClipRegion(const vcl::Region& region) +{ + if (mClipRegion == region) + return true; + SkiaZone zone; + checkPendingDrawing(); + checkSurface(); + mClipRegion = region; + SAL_INFO("vcl.skia.trace", "setclipregion(" << this << "): " << region); + SkCanvas* canvas = mSurface->getCanvas(); + assert(canvas->getSaveCount() == 3); + canvas->restore(); // undo previous clip state, see setCanvasScalingAndClipping() + canvas->save(); + setCanvasClipRegion(canvas, region); + return true; +} + +void SkiaSalGraphicsImpl::setCanvasClipRegion(SkCanvas* canvas, const vcl::Region& region) +{ + SkiaZone zone; + SkPath path; + // Always use region rectangles, regardless of what the region uses internally. + // That's what other VCL backends do, and trying to use addPolyPolygonToPath() + // in case a polygon is used leads to off-by-one errors such as tdf#133208. + RectangleVector rectangles; + region.GetRegionRectangles(rectangles); + path.incReserve(rectangles.size() + 1); + for (const tools::Rectangle& rectangle : rectangles) + path.addRect(SkRect::MakeXYWH(rectangle.getX(), rectangle.getY(), rectangle.GetWidth(), + rectangle.GetHeight())); + path.setFillType(SkPathFillType::kEvenOdd); + canvas->clipPath(path); +} + +void SkiaSalGraphicsImpl::ResetClipRegion() +{ + setClipRegion(vcl::Region(tools::Rectangle(0, 0, GetWidth(), GetHeight()))); +} + +const vcl::Region& SkiaSalGraphicsImpl::getClipRegion() const { return mClipRegion; } + +sal_uInt16 SkiaSalGraphicsImpl::GetBitCount() const { return 32; } + +tools::Long SkiaSalGraphicsImpl::GetGraphicsWidth() const { return GetWidth(); } + +void SkiaSalGraphicsImpl::SetLineColor() +{ + checkPendingDrawing(); + mLineColor = SALCOLOR_NONE; +} + +void SkiaSalGraphicsImpl::SetLineColor(Color nColor) +{ + checkPendingDrawing(); + mLineColor = nColor; +} + +void SkiaSalGraphicsImpl::SetFillColor() +{ + checkPendingDrawing(); + mFillColor = SALCOLOR_NONE; +} + +void SkiaSalGraphicsImpl::SetFillColor(Color nColor) +{ + checkPendingDrawing(); + mFillColor = nColor; +} + +void SkiaSalGraphicsImpl::SetXORMode(bool set, bool invert) +{ + XorMode newMode = set ? (invert ? XorMode::Invert : XorMode::Xor) : XorMode::None; + if (newMode == mXorMode) + return; + checkPendingDrawing(); + SAL_INFO("vcl.skia.trace", "setxormode(" << this << "): " << set << "/" << invert); + mXorMode = newMode; +} + +void SkiaSalGraphicsImpl::SetROPLineColor(SalROPColor nROPColor) +{ + checkPendingDrawing(); + switch (nROPColor) + { + case SalROPColor::N0: + mLineColor = Color(0, 0, 0); + break; + case SalROPColor::N1: + mLineColor = Color(0xff, 0xff, 0xff); + break; + case SalROPColor::Invert: + mLineColor = Color(0xff, 0xff, 0xff); + break; + } +} + +void SkiaSalGraphicsImpl::SetROPFillColor(SalROPColor nROPColor) +{ + checkPendingDrawing(); + switch (nROPColor) + { + case SalROPColor::N0: + mFillColor = Color(0, 0, 0); + break; + case SalROPColor::N1: + mFillColor = Color(0xff, 0xff, 0xff); + break; + case SalROPColor::Invert: + mFillColor = Color(0xff, 0xff, 0xff); + break; + } +} + +void SkiaSalGraphicsImpl::drawPixel(tools::Long nX, tools::Long nY) +{ + drawPixel(nX, nY, mLineColor); +} + +void SkiaSalGraphicsImpl::drawPixel(tools::Long nX, tools::Long nY, Color nColor) +{ + if (nColor == SALCOLOR_NONE) + return; + preDraw(); + SAL_INFO("vcl.skia.trace", "drawpixel(" << this << "): " << Point(nX, nY) << ":" << nColor); + addUpdateRegion(SkRect::MakeXYWH(nX, nY, 1, 1)); + SkPaint paint = makePixelPaint(nColor); + // Apparently drawPixel() is actually expected to set the pixel and not draw it. + paint.setBlendMode(SkBlendMode::kSrc); // set as is, including alpha + if (mScaling != 1 && isUnitTestRunning()) + { + // On HiDPI displays, draw a square on the entire non-hidpi "pixel" when running unittests, + // since tests often require precise pixel drawing. + paint.setStrokeWidth(1); // this will be scaled by mScaling + paint.setStrokeCap(SkPaint::kSquare_Cap); + } + getDrawCanvas()->drawPoint(toSkX(nX), toSkY(nY), paint); + postDraw(); +} + +void SkiaSalGraphicsImpl::drawLine(tools::Long nX1, tools::Long nY1, tools::Long nX2, + tools::Long nY2) +{ + if (mLineColor == SALCOLOR_NONE) + return; + preDraw(); + SAL_INFO("vcl.skia.trace", "drawline(" << this << "): " << Point(nX1, nY1) << "->" + << Point(nX2, nY2) << ":" << mLineColor); + addUpdateRegion(SkRect::MakeLTRB(nX1, nY1, nX2, nY2).makeSorted()); + SkPaint paint = makeLinePaint(); + paint.setAntiAlias(mParent.getAntiAlias()); + if (mScaling != 1 && isUnitTestRunning()) + { + // On HiDPI displays, do not draw hairlines, draw 1-pixel wide lines in order to avoid + // smoothing that would confuse unittests. + paint.setStrokeWidth(1); // this will be scaled by mScaling + paint.setStrokeCap(SkPaint::kSquare_Cap); + } + getDrawCanvas()->drawLine(toSkX(nX1), toSkY(nY1), toSkX(nX2), toSkY(nY2), paint); + postDraw(); +} + +void SkiaSalGraphicsImpl::privateDrawAlphaRect(tools::Long nX, tools::Long nY, tools::Long nWidth, + tools::Long nHeight, double fTransparency, + bool blockAA) +{ + preDraw(); + SAL_INFO("vcl.skia.trace", + "privatedrawrect(" << this << "): " << SkIRect::MakeXYWH(nX, nY, nWidth, nHeight) + << ":" << mLineColor << ":" << mFillColor << ":" << fTransparency); + addUpdateRegion(SkRect::MakeXYWH(nX, nY, nWidth, nHeight)); + SkCanvas* canvas = getDrawCanvas(); + if (mFillColor != SALCOLOR_NONE) + { + SkPaint paint = makeFillPaint(fTransparency); + paint.setAntiAlias(!blockAA && mParent.getAntiAlias()); + // HACK: If the polygon is just a line, it still should be drawn. But when filling + // Skia doesn't draw empty polygons, so in that case ensure the line is drawn. + if (mLineColor == SALCOLOR_NONE && SkSize::Make(nWidth, nHeight).isEmpty()) + paint.setStyle(SkPaint::kStroke_Style); + canvas->drawIRect(SkIRect::MakeXYWH(nX, nY, nWidth, nHeight), paint); + } + if (mLineColor != SALCOLOR_NONE && mLineColor != mFillColor) // otherwise handled by fill + { + SkPaint paint = makeLinePaint(fTransparency); + paint.setAntiAlias(!blockAA && mParent.getAntiAlias()); + if (mScaling != 1 && isUnitTestRunning()) + { + // On HiDPI displays, do not draw just a hairline but instead a full-width "pixel" when running unittests, + // since tests often require precise pixel drawing. + paint.setStrokeWidth(1); // this will be scaled by mScaling + paint.setStrokeCap(SkPaint::kSquare_Cap); + } + // The obnoxious "-1 DrawRect()" hack that I don't understand the purpose of (and I'm not sure + // if anybody does), but without it some cases do not work. The max() is needed because Skia + // will not draw anything if width or height is 0. + canvas->drawRect(SkRect::MakeXYWH(toSkX(nX), toSkY(nY), + std::max(tools::Long(1), nWidth - 1), + std::max(tools::Long(1), nHeight - 1)), + paint); + } + postDraw(); +} + +void SkiaSalGraphicsImpl::drawRect(tools::Long nX, tools::Long nY, tools::Long nWidth, + tools::Long nHeight) +{ + privateDrawAlphaRect(nX, nY, nWidth, nHeight, 0.0, true); +} + +void SkiaSalGraphicsImpl::drawPolyLine(sal_uInt32 nPoints, const Point* pPtAry) +{ + basegfx::B2DPolygon aPolygon; + aPolygon.append(basegfx::B2DPoint(pPtAry->getX(), pPtAry->getY()), nPoints); + for (sal_uInt32 i = 1; i < nPoints; ++i) + aPolygon.setB2DPoint(i, basegfx::B2DPoint(pPtAry[i].getX(), pPtAry[i].getY())); + aPolygon.setClosed(false); + + drawPolyLine(basegfx::B2DHomMatrix(), aPolygon, 0.0, 1.0, nullptr, basegfx::B2DLineJoin::Miter, + css::drawing::LineCap_BUTT, basegfx::deg2rad(15.0) /*default*/, false); +} + +void SkiaSalGraphicsImpl::drawPolygon(sal_uInt32 nPoints, const Point* pPtAry) +{ + basegfx::B2DPolygon aPolygon; + aPolygon.append(basegfx::B2DPoint(pPtAry->getX(), pPtAry->getY()), nPoints); + for (sal_uInt32 i = 1; i < nPoints; ++i) + aPolygon.setB2DPoint(i, basegfx::B2DPoint(pPtAry[i].getX(), pPtAry[i].getY())); + + drawPolyPolygon(basegfx::B2DHomMatrix(), basegfx::B2DPolyPolygon(aPolygon), 0.0); +} + +void SkiaSalGraphicsImpl::drawPolyPolygon(sal_uInt32 nPoly, const sal_uInt32* pPoints, + const Point** pPtAry) +{ + basegfx::B2DPolyPolygon aPolyPolygon; + for (sal_uInt32 nPolygon = 0; nPolygon < nPoly; ++nPolygon) + { + sal_uInt32 nPoints = pPoints[nPolygon]; + if (nPoints) + { + const Point* pSubPoints = pPtAry[nPolygon]; + basegfx::B2DPolygon aPolygon; + aPolygon.append(basegfx::B2DPoint(pSubPoints->getX(), pSubPoints->getY()), nPoints); + for (sal_uInt32 i = 1; i < nPoints; ++i) + aPolygon.setB2DPoint(i, + basegfx::B2DPoint(pSubPoints[i].getX(), pSubPoints[i].getY())); + + aPolyPolygon.append(aPolygon); + } + } + + drawPolyPolygon(basegfx::B2DHomMatrix(), aPolyPolygon, 0.0); +} + +bool SkiaSalGraphicsImpl::drawPolyPolygon(const basegfx::B2DHomMatrix& rObjectToDevice, + const basegfx::B2DPolyPolygon& rPolyPolygon, + double fTransparency) +{ + const bool bHasFill(mFillColor != SALCOLOR_NONE); + const bool bHasLine(mLineColor != SALCOLOR_NONE); + + if (rPolyPolygon.count() == 0 || !(bHasFill || bHasLine) || fTransparency < 0.0 + || fTransparency >= 1.0) + return true; + + basegfx::B2DPolyPolygon aPolyPolygon(rPolyPolygon); + aPolyPolygon.transform(rObjectToDevice); + + SAL_INFO("vcl.skia.trace", "drawpolypolygon(" << this << "): " << aPolyPolygon << ":" + << mLineColor << ":" << mFillColor); + + if (delayDrawPolyPolygon(aPolyPolygon, fTransparency)) + { + scheduleFlush(); + return true; + } + + performDrawPolyPolygon(aPolyPolygon, fTransparency, mParent.getAntiAlias()); + return true; +} + +void SkiaSalGraphicsImpl::performDrawPolyPolygon(const basegfx::B2DPolyPolygon& aPolyPolygon, + double fTransparency, bool useAA) +{ + preDraw(); + + SkPath polygonPath; + bool hasOnlyOrthogonal = true; + addPolyPolygonToPath(aPolyPolygon, polygonPath, &hasOnlyOrthogonal); + polygonPath.setFillType(SkPathFillType::kEvenOdd); + addUpdateRegion(polygonPath.getBounds()); + + // For lines we use toSkX()/toSkY() in order to pass centers of pixels to Skia, + // as that leads to better results with floating-point coordinates + // (e.g. https://bugs.chromium.org/p/skia/issues/detail?id=9611). + // But that means that we generally need to use it also for areas, so that they + // line up properly if used together (tdf#134346). + // On the other hand, with AA enabled and rectangular areas, this leads to fuzzy + // edges (tdf#137329). But since rectangular areas line up perfectly to pixels + // everywhere, it shouldn't be necessary to do this for them. + // So if AA is enabled, avoid this fixup for rectangular areas. + if (!useAA || !hasOnlyOrthogonal) + { + // We normally use pixel at their center positions, but slightly off (see toSkX/Y()). + // With AA lines that "slightly off" causes tiny changes of color, making some tests + // fail. Since moving AA-ed line slightly to a side doesn't cause any real visual + // difference, just place exactly at the center. tdf#134346 + const SkScalar posFix = useAA ? toSkXYFix : 0; + polygonPath.offset(toSkX(0) + posFix, toSkY(0) + posFix, nullptr); + } + if (mFillColor != SALCOLOR_NONE) + { + SkPaint aPaint = makeFillPaint(fTransparency); + aPaint.setAntiAlias(useAA); + // HACK: If the polygon is just a line, it still should be drawn. But when filling + // Skia doesn't draw empty polygons, so in that case ensure the line is drawn. + if (mLineColor == SALCOLOR_NONE && polygonPath.getBounds().isEmpty()) + aPaint.setStyle(SkPaint::kStroke_Style); + getDrawCanvas()->drawPath(polygonPath, aPaint); + } + if (mLineColor != SALCOLOR_NONE && mLineColor != mFillColor) // otherwise handled by fill + { + SkPaint aPaint = makeLinePaint(fTransparency); + aPaint.setAntiAlias(useAA); + getDrawCanvas()->drawPath(polygonPath, aPaint); + } + postDraw(); +} + +namespace +{ +struct LessThan +{ + bool operator()(const basegfx::B2DPoint& point1, const basegfx::B2DPoint& point2) const + { + if (basegfx::fTools::equal(point1.getX(), point2.getX())) + return basegfx::fTools::less(point1.getY(), point2.getY()); + return basegfx::fTools::less(point1.getX(), point2.getX()); + } +}; +} // namespace + +bool SkiaSalGraphicsImpl::delayDrawPolyPolygon(const basegfx::B2DPolyPolygon& aPolyPolygon, + double fTransparency) +{ + // There is some code that needlessly subdivides areas into adjacent rectangles, + // but Skia doesn't line them up perfectly if AA is enabled (e.g. Cairo, Qt5 do, + // but Skia devs claim it's working as intended + // https://groups.google.com/d/msg/skia-discuss/NlKpD2X_5uc/Vuwd-kyYBwAJ). + // An example is tdf#133016, which triggers SvgStyleAttributes::add_stroke() + // implementing a line stroke as a bunch of polygons instead of just one, and + // SvgLinearAtomPrimitive2D::create2DDecomposition() creates a gradient + // as a series of polygons of gradually changing color. Those places should be + // changed, but try to merge those split polygons back into the original one, + // where the needlessly created edges causing problems will not exist. + // This means drawing of such polygons needs to be delayed, so that they can + // be possibly merged with the next one. + // Merge only polygons of the same properties (color, etc.), so the gradient problem + // actually isn't handled here. + + // Only AA polygons need merging, because they do not line up well because of the AA of the edges. + if (!mParent.getAntiAlias()) + return false; + // Only filled polygons without an outline are problematic. + if (mFillColor == SALCOLOR_NONE || mLineColor != SALCOLOR_NONE) + return false; + // Merge only simple polygons, real polypolygons most likely aren't needlessly split, + // so they do not need joining. + if (aPolyPolygon.count() != 1) + return false; + // If the polygon is not closed, it doesn't mark an area to be filled. + if (!aPolyPolygon.isClosed()) + return false; + // If a polygon does not contain a straight line, i.e. it's all curves, then do not merge. + // First of all that's even more expensive, and second it's very unlikely that it's a polygon + // split into more polygons. + if (!polygonContainsLine(aPolyPolygon)) + return false; + + if (mLastPolyPolygonInfo.polygons.size() != 0 + && (mLastPolyPolygonInfo.transparency != fTransparency + || !mLastPolyPolygonInfo.bounds.overlaps(aPolyPolygon.getB2DRange()))) + { + checkPendingDrawing(); // Cannot be parts of the same larger polygon, draw the last and reset. + } + if (!mLastPolyPolygonInfo.polygons.empty()) + { + assert(aPolyPolygon.count() == 1); + assert(mLastPolyPolygonInfo.polygons.back().count() == 1); + // Check if the new and the previous polygon share at least one point. If not, then they + // cannot be adjacent polygons, so there's no point in trying to merge them. + bool sharePoint = false; + const basegfx::B2DPolygon& poly1 = aPolyPolygon.getB2DPolygon(0); + const basegfx::B2DPolygon& poly2 = mLastPolyPolygonInfo.polygons.back().getB2DPolygon(0); + o3tl::sorted_vector<basegfx::B2DPoint, LessThan> poly1Points; // for O(n log n) + poly1Points.reserve(poly1.count()); + for (sal_uInt32 i = 0; i < poly1.count(); ++i) + poly1Points.insert(poly1.getB2DPoint(i)); + for (sal_uInt32 i = 0; i < poly2.count(); ++i) + if (poly1Points.find(poly2.getB2DPoint(i)) != poly1Points.end()) + { + sharePoint = true; + break; + } + if (!sharePoint) + checkPendingDrawing(); // Draw the previous one and reset. + } + // Collect the polygons that can be possibly merged. Do the merging only once at the end, + // because it's not a cheap operation. + mLastPolyPolygonInfo.polygons.push_back(aPolyPolygon); + mLastPolyPolygonInfo.bounds.expand(aPolyPolygon.getB2DRange()); + mLastPolyPolygonInfo.transparency = fTransparency; + return true; +} + +// Tdf#140848 - basegfx::utils::mergeToSinglePolyPolygon() seems to have rounding +// errors that sometimes cause it to merge incorrectly. +static void roundPolygonPoints(basegfx::B2DPolyPolygon& polyPolygon) +{ + for (basegfx::B2DPolygon& polygon : polyPolygon) + { + polygon.makeUnique(); + for (sal_uInt32 i = 0; i < polygon.count(); ++i) + polygon.setB2DPoint(i, basegfx::B2DPoint(basegfx::fround(polygon.getB2DPoint(i)))); + // Control points are saved as vectors relative to points, so hopefully + // there's no need to round those. + } +} + +void SkiaSalGraphicsImpl::checkPendingDrawing() +{ + if (mLastPolyPolygonInfo.polygons.size() != 0) + { // Flush any pending polygon drawing. + basegfx::B2DPolyPolygonVector polygons; + std::swap(polygons, mLastPolyPolygonInfo.polygons); + double transparency = mLastPolyPolygonInfo.transparency; + mLastPolyPolygonInfo.bounds.reset(); + if (polygons.size() == 1) + performDrawPolyPolygon(polygons.front(), transparency, true); + else + { + for (basegfx::B2DPolyPolygon& p : polygons) + roundPolygonPoints(p); + performDrawPolyPolygon(basegfx::utils::mergeToSinglePolyPolygon(polygons), transparency, + true); + } + } +} + +bool SkiaSalGraphicsImpl::drawPolyLine(const basegfx::B2DHomMatrix& rObjectToDevice, + const basegfx::B2DPolygon& rPolyLine, double fTransparency, + double fLineWidth, const std::vector<double>* pStroke, + basegfx::B2DLineJoin eLineJoin, + css::drawing::LineCap eLineCap, double fMiterMinimumAngle, + bool bPixelSnapHairline) +{ + if (!rPolyLine.count() || fTransparency < 0.0 || fTransparency > 1.0 + || mLineColor == SALCOLOR_NONE) + { + return true; + } + + preDraw(); + SAL_INFO("vcl.skia.trace", "drawpolyline(" << this << "): " << rPolyLine << ":" << mLineColor); + + // Adjust line width for object-to-device scale. + fLineWidth = (rObjectToDevice * basegfx::B2DVector(fLineWidth, 0)).getLength(); + // On HiDPI displays, do not draw hairlines, draw 1-pixel wide lines in order to avoid + // smoothing that would confuse unittests. + if (fLineWidth == 0 && mScaling != 1 && isUnitTestRunning()) + fLineWidth = 1; // this will be scaled by mScaling + + // Transform to DeviceCoordinates, get DeviceLineWidth, execute PixelSnapHairline + basegfx::B2DPolygon aPolyLine(rPolyLine); + aPolyLine.transform(rObjectToDevice); + if (bPixelSnapHairline) + { + aPolyLine = basegfx::utils::snapPointsOfHorizontalOrVerticalEdges(aPolyLine); + } + + SkPaint aPaint = makeLinePaint(fTransparency); + + switch (eLineJoin) + { + case basegfx::B2DLineJoin::Bevel: + aPaint.setStrokeJoin(SkPaint::kBevel_Join); + break; + case basegfx::B2DLineJoin::Round: + aPaint.setStrokeJoin(SkPaint::kRound_Join); + break; + case basegfx::B2DLineJoin::NONE: + break; + case basegfx::B2DLineJoin::Miter: + aPaint.setStrokeJoin(SkPaint::kMiter_Join); + // convert miter minimum angle to miter limit + aPaint.setStrokeMiter(1.0 / std::sin(fMiterMinimumAngle / 2.0)); + break; + } + + switch (eLineCap) + { + case css::drawing::LineCap_ROUND: + aPaint.setStrokeCap(SkPaint::kRound_Cap); + break; + case css::drawing::LineCap_SQUARE: + aPaint.setStrokeCap(SkPaint::kSquare_Cap); + break; + default: // css::drawing::LineCap_BUTT: + aPaint.setStrokeCap(SkPaint::kButt_Cap); + break; + } + + aPaint.setStrokeWidth(fLineWidth); + aPaint.setAntiAlias(mParent.getAntiAlias()); + // See the tdf#134346 comment above. + const SkScalar posFix = mParent.getAntiAlias() ? toSkXYFix : 0; + + if (pStroke && std::accumulate(pStroke->begin(), pStroke->end(), 0.0) != 0) + { + std::vector<SkScalar> intervals; + // Transform size by the matrix. + for (double stroke : *pStroke) + intervals.push_back((rObjectToDevice * basegfx::B2DVector(stroke, 0)).getLength()); + aPaint.setPathEffect(SkDashPathEffect::Make(intervals.data(), intervals.size(), 0)); + } + + // Skia does not support basegfx::B2DLineJoin::NONE, so in that case batch only if lines + // are not wider than a pixel. + if (eLineJoin != basegfx::B2DLineJoin::NONE || fLineWidth <= 1.0) + { + SkPath aPath; + aPath.incReserve(aPolyLine.count() * 3); // because cubicTo is 3 elements + addPolygonToPath(aPolyLine, aPath); + aPath.offset(toSkX(0) + posFix, toSkY(0) + posFix, nullptr); + addUpdateRegion(aPath.getBounds()); + getDrawCanvas()->drawPath(aPath, aPaint); + } + else + { + sal_uInt32 nPoints = aPolyLine.count(); + bool bClosed = aPolyLine.isClosed(); + bool bHasCurves = aPolyLine.areControlPointsUsed(); + for (sal_uInt32 j = 0; j < nPoints; ++j) + { + SkPath aPath; + aPath.incReserve(2 * 3); // because cubicTo is 3 elements + addPolygonToPath(aPolyLine, aPath, j, j + 1, nPoints, bClosed, bHasCurves); + aPath.offset(toSkX(0) + posFix, toSkY(0) + posFix, nullptr); + addUpdateRegion(aPath.getBounds()); + getDrawCanvas()->drawPath(aPath, aPaint); + } + } + + postDraw(); + + return true; +} + +bool SkiaSalGraphicsImpl::drawPolyLineBezier(sal_uInt32, const Point*, const PolyFlags*) +{ + return false; +} + +bool SkiaSalGraphicsImpl::drawPolygonBezier(sal_uInt32, const Point*, const PolyFlags*) +{ + return false; +} + +bool SkiaSalGraphicsImpl::drawPolyPolygonBezier(sal_uInt32, const sal_uInt32*, const Point* const*, + const PolyFlags* const*) +{ + return false; +} + +void SkiaSalGraphicsImpl::copyArea(tools::Long nDestX, tools::Long nDestY, tools::Long nSrcX, + tools::Long nSrcY, tools::Long nSrcWidth, tools::Long nSrcHeight, + bool /*bWindowInvalidate*/) +{ + if (nDestX == nSrcX && nDestY == nSrcY) + return; + preDraw(); + SAL_INFO("vcl.skia.trace", "copyarea(" + << this << "): " << Point(nSrcX, nSrcY) << "->" + << SkIRect::MakeXYWH(nDestX, nDestY, nSrcWidth, nSrcHeight)); + // Using SkSurface::draw() should be more efficient, but it's too buggy. + SalTwoRect rPosAry(nSrcX, nSrcY, nSrcWidth, nSrcHeight, nDestX, nDestY, nSrcWidth, nSrcHeight); + privateCopyBits(rPosAry, this); + postDraw(); +} + +void SkiaSalGraphicsImpl::copyBits(const SalTwoRect& rPosAry, SalGraphics* pSrcGraphics) +{ + preDraw(); + SkiaSalGraphicsImpl* src; + if (pSrcGraphics) + { + assert(dynamic_cast<SkiaSalGraphicsImpl*>(pSrcGraphics->GetImpl())); + src = static_cast<SkiaSalGraphicsImpl*>(pSrcGraphics->GetImpl()); + src->checkSurface(); + src->flushDrawing(); + } + else + { + src = this; + assert(mXorMode == XorMode::None); + } + auto srcDebug = [&]() -> std::string { + if (src == this) + return "(self)"; + else + { + std::ostringstream stream; + stream << "(" << src << ")"; + return stream.str(); + } + }; + SAL_INFO("vcl.skia.trace", "copybits(" << this << "): " << srcDebug() << ": " << rPosAry); + privateCopyBits(rPosAry, src); + postDraw(); +} + +void SkiaSalGraphicsImpl::privateCopyBits(const SalTwoRect& rPosAry, SkiaSalGraphicsImpl* src) +{ + assert(mXorMode == XorMode::None); + addUpdateRegion(SkRect::MakeXYWH(rPosAry.mnDestX, rPosAry.mnDestY, rPosAry.mnDestWidth, + rPosAry.mnDestHeight)); + SkPaint paint; + paint.setBlendMode(SkBlendMode::kSrc); // copy as is, including alpha + SkIRect srcRect = SkIRect::MakeXYWH(rPosAry.mnSrcX, rPosAry.mnSrcY, rPosAry.mnSrcWidth, + rPosAry.mnSrcHeight); + SkRect destRect = SkRect::MakeXYWH(rPosAry.mnDestX, rPosAry.mnDestY, rPosAry.mnDestWidth, + rPosAry.mnDestHeight); + + if (!SkIRect::Intersects(srcRect, SkIRect::MakeWH(src->GetWidth(), src->GetHeight())) + || !SkRect::Intersects(destRect, SkRect::MakeWH(GetWidth(), GetHeight()))) + return; + + if (src == this) + { + // Copy-to-self means that we'd take a snapshot, which would refcount the data, + // and then drawing would result in copy in write, copying the entire surface. + // Try to copy less by making a snapshot of only what is needed. + // A complication here is that drawImageRect() can handle coordinates outside + // of surface fine, but makeImageSnapshot() will crop to the surface area, + // so do that manually here in order to adjust also destination rectangle. + if (srcRect.x() < 0 || srcRect.y() < 0) + { + destRect.fLeft += -srcRect.x(); + destRect.fTop += -srcRect.y(); + srcRect.adjust(-srcRect.x(), -srcRect.y(), 0, 0); + } + // Note that right() and bottom() are not inclusive (are outside of the rect). + if (srcRect.right() - 1 > GetWidth() || srcRect.bottom() - 1 > GetHeight()) + { + destRect.fRight += GetWidth() - srcRect.right(); + destRect.fBottom += GetHeight() - srcRect.bottom(); + srcRect.adjust(0, 0, GetWidth() - srcRect.right(), GetHeight() - srcRect.bottom()); + } + // Scaling for source coordinates must be done manually. + if (src->mScaling != 1) + srcRect = scaleRect(srcRect, src->mScaling); + sk_sp<SkImage> image = makeCheckedImageSnapshot(src->mSurface, srcRect); + srcRect.offset(-srcRect.x(), -srcRect.y()); + getDrawCanvas()->drawImageRect(image, SkRect::Make(srcRect), destRect, + makeSamplingOptions(rPosAry, mScaling, src->mScaling), + &paint, SkCanvas::kFast_SrcRectConstraint); + } + else + { + // Scaling for source coordinates must be done manually. + if (src->mScaling != 1) + srcRect = scaleRect(srcRect, src->mScaling); + // Do not use makeImageSnapshot(rect), as that one may make a needless data copy. + getDrawCanvas()->drawImageRect(makeCheckedImageSnapshot(src->mSurface), + SkRect::Make(srcRect), destRect, + makeSamplingOptions(rPosAry, mScaling, src->mScaling), + &paint, SkCanvas::kFast_SrcRectConstraint); + } +} + +bool SkiaSalGraphicsImpl::blendBitmap(const SalTwoRect& rPosAry, const SalBitmap& rBitmap) +{ + if (checkInvalidSourceOrDestination(rPosAry)) + return false; + + assert(dynamic_cast<const SkiaSalBitmap*>(&rBitmap)); + const SkiaSalBitmap& rSkiaBitmap = static_cast<const SkiaSalBitmap&>(rBitmap); + // This is used by VirtualDevice in the alpha mode for the "alpha" layer which + // is actually one-minus-alpha (opacity). Therefore white=0xff=transparent, + // black=0x00=opaque. So the result is transparent only if both the inputs + // are transparent. Since for blending operations white=1.0 and black=0.0, + // kMultiply should handle exactly that (transparent*transparent=transparent, + // opaque*transparent=opaque). And guessing from the "floor" in TYPE_BLEND in opengl's + // combinedTextureFragmentShader.glsl, the layer is not even alpha values but + // simply yes-or-no mask. + // See also blendAlphaBitmap(). + if (rSkiaBitmap.IsFullyOpaqueAsAlpha()) + { + // Optimization. If the bitmap means fully opaque, it's all zero's. In CPU + // mode it should be faster to just copy instead of SkBlendMode::kMultiply. + drawBitmap(rPosAry, rSkiaBitmap); + } + else + drawBitmap(rPosAry, rSkiaBitmap, SkBlendMode::kMultiply); + return true; +} + +bool SkiaSalGraphicsImpl::blendAlphaBitmap(const SalTwoRect& rPosAry, + const SalBitmap& rSourceBitmap, + const SalBitmap& rMaskBitmap, + const SalBitmap& rAlphaBitmap) +{ + if (checkInvalidSourceOrDestination(rPosAry)) + return false; + + assert(dynamic_cast<const SkiaSalBitmap*>(&rSourceBitmap)); + assert(dynamic_cast<const SkiaSalBitmap*>(&rMaskBitmap)); + assert(dynamic_cast<const SkiaSalBitmap*>(&rAlphaBitmap)); + const SkiaSalBitmap& rSkiaSourceBitmap = static_cast<const SkiaSalBitmap&>(rSourceBitmap); + const SkiaSalBitmap& rSkiaMaskBitmap = static_cast<const SkiaSalBitmap&>(rMaskBitmap); + const SkiaSalBitmap& rSkiaAlphaBitmap = static_cast<const SkiaSalBitmap&>(rAlphaBitmap); + + if (rSkiaMaskBitmap.IsFullyOpaqueAsAlpha()) + { + // Optimization. If the mask of the bitmap to be blended means it's actually opaque, + // just draw the bitmap directly (that's what the math below will result in). + drawBitmap(rPosAry, rSkiaSourceBitmap); + return true; + } + // This was originally implemented for the OpenGL drawing method and it is poorly documented. + // The source and mask bitmaps are the usual data and alpha bitmaps, and 'alpha' + // is the "alpha" layer of the VirtualDevice (the alpha in VirtualDevice is also stored + // as a separate bitmap). Now if I understand it correctly these two alpha masks first need + // to be combined into the actual alpha mask to be used. The formula for TYPE_BLEND + // in opengl's combinedTextureFragmentShader.glsl is + // "result_alpha = 1.0 - (1.0 - floor(alpha)) * mask". + // See also blendBitmap(). + + SkSamplingOptions samplingOptions = makeSamplingOptions(rPosAry, mScaling); + // First do the "( 1 - alpha ) * mask" + // (no idea how to do "floor", but hopefully not needed in practice). + sk_sp<SkShader> shaderAlpha + = SkShaders::Blend(SkBlendMode::kDstOut, rSkiaMaskBitmap.GetAlphaSkShader(samplingOptions), + rSkiaAlphaBitmap.GetAlphaSkShader(samplingOptions)); + // And now draw the bitmap with "1 - x", where x is the "( 1 - alpha ) * mask". + sk_sp<SkShader> shader = SkShaders::Blend(SkBlendMode::kSrcOut, shaderAlpha, + rSkiaSourceBitmap.GetSkShader(samplingOptions)); + drawShader(rPosAry, shader); + return true; +} + +void SkiaSalGraphicsImpl::drawBitmap(const SalTwoRect& rPosAry, const SalBitmap& rSalBitmap) +{ + if (checkInvalidSourceOrDestination(rPosAry)) + return; + + assert(dynamic_cast<const SkiaSalBitmap*>(&rSalBitmap)); + const SkiaSalBitmap& rSkiaSourceBitmap = static_cast<const SkiaSalBitmap&>(rSalBitmap); + + drawBitmap(rPosAry, rSkiaSourceBitmap); +} + +void SkiaSalGraphicsImpl::drawBitmap(const SalTwoRect& rPosAry, const SalBitmap& rSalBitmap, + const SalBitmap& rMaskBitmap) +{ + drawAlphaBitmap(rPosAry, rSalBitmap, rMaskBitmap); +} + +void SkiaSalGraphicsImpl::drawMask(const SalTwoRect& rPosAry, const SalBitmap& rSalBitmap, + Color nMaskColor) +{ + assert(dynamic_cast<const SkiaSalBitmap*>(&rSalBitmap)); + const SkiaSalBitmap& skiaBitmap = static_cast<const SkiaSalBitmap&>(rSalBitmap); + drawShader( + rPosAry, + SkShaders::Blend(SkBlendMode::kDstOut, // VCL alpha is one-minus-alpha. + SkShaders::Color(toSkColor(nMaskColor)), + skiaBitmap.GetAlphaSkShader(makeSamplingOptions(rPosAry, mScaling)))); +} + +std::shared_ptr<SalBitmap> SkiaSalGraphicsImpl::getBitmap(tools::Long nX, tools::Long nY, + tools::Long nWidth, tools::Long nHeight) +{ + SkiaZone zone; + checkSurface(); + SAL_INFO("vcl.skia.trace", + "getbitmap(" << this << "): " << SkIRect::MakeXYWH(nX, nY, nWidth, nHeight)); + flushDrawing(); + // TODO makeImageSnapshot(rect) may copy the data, which may be a waste if this is used + // e.g. for VirtualDevice's lame alpha blending, in which case the image will eventually end up + // in blendAlphaBitmap(), where we could simply use the proper rect of the image. + sk_sp<SkImage> image = makeCheckedImageSnapshot( + mSurface, scaleRect(SkIRect::MakeXYWH(nX, nY, nWidth, nHeight), mScaling)); + std::shared_ptr<SkiaSalBitmap> bitmap = std::make_shared<SkiaSalBitmap>(image); + // If the surface is scaled for HiDPI, the bitmap needs to be scaled down, otherwise + // it would have incorrect size from the API point of view. The DirectImage::Yes handling + // in mergeCacheBitmaps() should access the original unscaled bitmap data to avoid + // pointless scaling back and forth. + if (mScaling != 1) + { + if (!isUnitTestRunning()) + bitmap->Scale(1.0 / mScaling, 1.0 / mScaling, goodScalingQuality()); + else + { + // Some tests require exact pixel values and would be confused by smooth-scaling. + // And some draw something smooth and not smooth-scaling there would break the checks. + if (isUnitTestRunning("BackendTest__testDrawHaflEllipseAAWithPolyLineB2D_") + || isUnitTestRunning("BackendTest__testDrawRectAAWithLine_") + || isUnitTestRunning("GraphicsRenderTest__testDrawRectAAWithLine")) + { + bitmap->Scale(1.0 / mScaling, 1.0 / mScaling, goodScalingQuality()); + } + else + bitmap->Scale(1.0 / mScaling, 1.0 / mScaling, BmpScaleFlag::NearestNeighbor); + } + } + return bitmap; +} + +Color SkiaSalGraphicsImpl::getPixel(tools::Long nX, tools::Long nY) +{ + SkiaZone zone; + checkSurface(); + SAL_INFO("vcl.skia.trace", "getpixel(" << this << "): " << Point(nX, nY)); + flushDrawing(); + // This is presumably slow, but getPixel() should be generally used only by unit tests. + SkBitmap bitmap; + if (!bitmap.tryAllocN32Pixels(mSurface->width(), mSurface->height())) + abort(); + if (!mSurface->readPixels(bitmap, 0, 0)) + abort(); + return fromSkColor(bitmap.getColor(nX * mScaling, nY * mScaling)); +} + +void SkiaSalGraphicsImpl::invert(basegfx::B2DPolygon const& rPoly, SalInvert eFlags) +{ + preDraw(); + SAL_INFO("vcl.skia.trace", "invert(" << this << "): " << rPoly << ":" << int(eFlags)); + assert(mXorMode == XorMode::None); + SkPath aPath; + aPath.incReserve(rPoly.count()); + addPolygonToPath(rPoly, aPath); + aPath.setFillType(SkPathFillType::kEvenOdd); + addUpdateRegion(aPath.getBounds()); + SkAutoCanvasRestore autoRestore(getDrawCanvas(), true); + SkPaint aPaint; + // There's no blend mode for inverting as such, but kExclusion is 's + d - 2*s*d', + // so with d = 1.0 (all channels) it becomes effectively '1 - s', i.e. inverted color. + aPaint.setBlendMode(SkBlendMode::kExclusion); + aPaint.setColor(SkColorSetARGB(255, 255, 255, 255)); + // TrackFrame just inverts a dashed path around the polygon + if (eFlags == SalInvert::TrackFrame) + { + // TrackFrame is not supposed to paint outside of the polygon (usually rectangle), + // but wider stroke width usually results in that, so ensure the requirement + // by clipping. + getDrawCanvas()->clipRect(aPath.getBounds(), SkClipOp::kIntersect, false); + aPaint.setStrokeWidth(2); + constexpr float intervals[] = { 4.0f, 4.0f }; + aPaint.setStyle(SkPaint::kStroke_Style); + aPaint.setPathEffect(SkDashPathEffect::Make(intervals, SK_ARRAY_COUNT(intervals), 0)); + } + else + { + aPaint.setStyle(SkPaint::kFill_Style); + + // N50 inverts in checker pattern + if (eFlags == SalInvert::N50) + { + // This creates 2x2 checker pattern bitmap + // TODO Use createSkSurface() and cache the image + SkBitmap aBitmap; + aBitmap.allocN32Pixels(2, 2); + const SkPMColor white = SkPreMultiplyARGB(0xFF, 0xFF, 0xFF, 0xFF); + const SkPMColor black = SkPreMultiplyARGB(0xFF, 0x00, 0x00, 0x00); + SkPMColor* scanline; + scanline = aBitmap.getAddr32(0, 0); + *scanline++ = white; + *scanline++ = black; + scanline = aBitmap.getAddr32(0, 1); + *scanline++ = black; + *scanline++ = white; + aBitmap.setImmutable(); + // The bitmap is repeated in both directions the checker pattern is as big + // as the polygon (usually rectangle) + aPaint.setShader( + aBitmap.makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, SkSamplingOptions())); + } + } + getDrawCanvas()->drawPath(aPath, aPaint); + postDraw(); +} + +void SkiaSalGraphicsImpl::invert(tools::Long nX, tools::Long nY, tools::Long nWidth, + tools::Long nHeight, SalInvert eFlags) +{ + basegfx::B2DRectangle aRectangle(nX, nY, nX + nWidth, nY + nHeight); + auto aRect = basegfx::utils::createPolygonFromRect(aRectangle); + invert(aRect, eFlags); +} + +void SkiaSalGraphicsImpl::invert(sal_uInt32 nPoints, const Point* pPointArray, SalInvert eFlags) +{ + basegfx::B2DPolygon aPolygon; + aPolygon.append(basegfx::B2DPoint(pPointArray[0].getX(), pPointArray[0].getY()), nPoints); + for (sal_uInt32 i = 1; i < nPoints; ++i) + { + aPolygon.setB2DPoint(i, basegfx::B2DPoint(pPointArray[i].getX(), pPointArray[i].getY())); + } + aPolygon.setClosed(true); + + invert(aPolygon, eFlags); +} + +bool SkiaSalGraphicsImpl::drawEPS(tools::Long, tools::Long, tools::Long, tools::Long, void*, + sal_uInt32) +{ + return false; +} + +// Create SkImage from a bitmap and possibly an alpha mask (the usual VCL one-minus-alpha), +// with the given target size. Result will be possibly cached, unless disabled. +// Especially in raster mode scaling and alpha blending may be expensive if done repeatedly. +sk_sp<SkImage> SkiaSalGraphicsImpl::mergeCacheBitmaps(const SkiaSalBitmap& bitmap, + const SkiaSalBitmap* alphaBitmap, + const Size& targetSize) +{ + if (alphaBitmap) + assert(bitmap.GetSize() == alphaBitmap->GetSize()); + + if (targetSize.IsEmpty()) + return {}; + if (alphaBitmap && alphaBitmap->IsFullyOpaqueAsAlpha()) + alphaBitmap = nullptr; // the alpha can be ignored + if (bitmap.PreferSkShader() && (!alphaBitmap || alphaBitmap->PreferSkShader())) + return {}; + + // If the bitmap has SkImage that matches the required size, try to use it, even + // if it doesn't match bitmap.GetSize(). This can happen with delayed scaling. + // This will catch cases such as some code pre-scaling the bitmap, which would make GetSkImage() + // scale, changing GetImageKey() in the process so we'd have to re-cache, and then we'd need + // to scale again in this function. + bool bitmapReady = false; + bool alphaBitmapReady = false; + if (const sk_sp<SkImage>& image = bitmap.GetSkImage(DirectImage::Yes)) + { + assert(!bitmap.PreferSkShader()); + if (imageSize(image) == targetSize) + bitmapReady = true; + } + // If the image usable and there's no alpha, then it matches exactly what's wanted. + if (bitmapReady && !alphaBitmap) + return bitmap.GetSkImage(DirectImage::Yes); + if (alphaBitmap) + { + if (!alphaBitmap->GetAlphaSkImage(DirectImage::Yes) + && alphaBitmap->GetSkImage(DirectImage::Yes) + && imageSize(alphaBitmap->GetSkImage(DirectImage::Yes)) == targetSize) + { + // There's a usable non-alpha image, try to convert it to alpha. + assert(!alphaBitmap->PreferSkShader()); + const_cast<SkiaSalBitmap*>(alphaBitmap)->TryDirectConvertToAlphaNoScaling(); + } + if (const sk_sp<SkImage>& image = alphaBitmap->GetAlphaSkImage(DirectImage::Yes)) + { + assert(!alphaBitmap->PreferSkShader()); + if (imageSize(image) == targetSize) + alphaBitmapReady = true; + } + } + + if (bitmapReady && (!alphaBitmap || alphaBitmapReady)) + { + // Try to find a cached image based on the already existing images. + OString key = makeCachedImageKey(bitmap, alphaBitmap, targetSize, DirectImage::Yes, + DirectImage::Yes); + if (sk_sp<SkImage> image = findCachedImage(key)) + { + assert(imageSize(image) == targetSize); + return image; + } + } + + // Probably not much point in caching of just doing a copy. + if (alphaBitmap == nullptr && targetSize == bitmap.GetSize()) + return {}; + // Image too small to be worth caching if not scaling. + if (targetSize == bitmap.GetSize() && targetSize.Width() < 100 && targetSize.Height() < 100) + return {}; + // GPU-accelerated drawing with SkShader should be fast enough to not need caching. + if (isGPU()) + { + // tdf#140925: But if this is such an extensive downscaling that caching the result + // would noticeably reduce amount of data processed by the GPU on repeated usage, do it. + int reduceRatio = bitmap.GetSize().Width() * bitmap.GetSize().Height() / targetSize.Width() + / targetSize.Height(); + if (reduceRatio < 10) + return {}; + } + // Do not cache the result if it would take most of the cache and thus get evicted soon. + if (targetSize.Width() * targetSize.Height() * 4 > maxImageCacheSize() * 0.7) + return {}; + + // Use ready direct image if they are both available, now even the size doesn't matter + // (we'll scale as necessary and it's better to scale from the original). Require only + // that they are the same size, or that one prefers a shader or doesn't exist + // (i.e. avoid two images of different size). + bitmapReady = bitmap.GetSkImage(DirectImage::Yes) != nullptr; + alphaBitmapReady = alphaBitmap && alphaBitmap->GetAlphaSkImage(DirectImage::Yes) != nullptr; + if (bitmapReady && alphaBitmap && !alphaBitmapReady && !alphaBitmap->PreferSkShader()) + bitmapReady = false; + if (alphaBitmapReady && !bitmapReady && bitmap.PreferSkShader()) + alphaBitmapReady = false; + + DirectImage bitmapType = bitmapReady ? DirectImage::Yes : DirectImage::No; + DirectImage alphaBitmapType = alphaBitmapReady ? DirectImage::Yes : DirectImage::No; + + // Try to find a cached result, this time after possible delayed scaling. + OString key = makeCachedImageKey(bitmap, alphaBitmap, targetSize, bitmapType, alphaBitmapType); + if (sk_sp<SkImage> image = findCachedImage(key)) + { + assert(imageSize(image) == targetSize); + return image; + } + + // In some cases (tdf#134237) the target size may be very large. In that case it's + // better to rely on Skia to clip and draw only the necessary, rather than prepare + // a very large image only to not use most of it. Do this only after checking whether + // the image is already cached, since it might have been already cached in a previous + // call that had the draw area large enough to be seen as worth caching. + const Size drawAreaSize = mClipRegion.GetBoundRect().GetSize() * mScaling; + if (targetSize.Width() > drawAreaSize.Width() || targetSize.Height() > drawAreaSize.Height()) + { + // This is a bit tricky. The condition above just checks that at least a part of the resulting + // image will not be used (it's larger then our drawing area). But this may often happen + // when just scrolling a document with a large image, where the caching may very well be worth it. + // Since the problem is mainly the cost of upscaling and then the size of the resulting bitmap, + // compute a ratio of how much this is going to be scaled up, how much this is larger than + // the drawing area, and then refuse to cache if it's too much. + const double upscaleRatio + = std::max(1.0, 1.0 * targetSize.Width() / bitmap.GetSize().Width() + * targetSize.Height() / bitmap.GetSize().Height()); + const double oversizeRatio = 1.0 * targetSize.Width() / drawAreaSize.Width() + * targetSize.Height() / drawAreaSize.Height(); + const double ratio = upscaleRatio * oversizeRatio; + if (ratio > 4) + { + SAL_INFO("vcl.skia.trace", "mergecachebitmaps(" + << this << "): not caching, ratio:" << ratio << ", " + << bitmap.GetSize() << "->" << targetSize << " in " + << drawAreaSize); + return {}; + } + } + + Size sourceSize; + if (bitmapReady) + sourceSize = imageSize(bitmap.GetSkImage(DirectImage::Yes)); + else if (alphaBitmapReady) + sourceSize = imageSize(alphaBitmap->GetAlphaSkImage(DirectImage::Yes)); + else + sourceSize = bitmap.GetSize(); + + // Generate a new result and cache it. + sk_sp<SkSurface> tmpSurface + = createSkSurface(targetSize, alphaBitmap ? kPremul_SkAlphaType : bitmap.alphaType()); + if (!tmpSurface) + return nullptr; + SkCanvas* canvas = tmpSurface->getCanvas(); + SkAutoCanvasRestore autoRestore(canvas, true); + SkPaint paint; + SkSamplingOptions samplingOptions; + if (targetSize != sourceSize) + { + SkMatrix matrix; + matrix.set(SkMatrix::kMScaleX, 1.0 * targetSize.Width() / sourceSize.Width()); + matrix.set(SkMatrix::kMScaleY, 1.0 * targetSize.Height() / sourceSize.Height()); + canvas->concat(matrix); + if (!isUnitTestRunning()) // unittests want exact pixel values + samplingOptions = makeSamplingOptions(matrix, 1); + } + if (alphaBitmap != nullptr) + { + canvas->clear(SK_ColorTRANSPARENT); + paint.setShader( + SkShaders::Blend(SkBlendMode::kDstOut, bitmap.GetSkShader(samplingOptions, bitmapType), + alphaBitmap->GetAlphaSkShader(samplingOptions, alphaBitmapType))); + canvas->drawPaint(paint); + } + else if (bitmap.PreferSkShader()) + { + paint.setShader(bitmap.GetSkShader(samplingOptions, bitmapType)); + canvas->drawPaint(paint); + } + else + canvas->drawImage(bitmap.GetSkImage(bitmapType), 0, 0, samplingOptions, &paint); + if (isGPU()) + SAL_INFO("vcl.skia.trace", "mergecachebitmaps(" << this << "): caching GPU downscaling:" + << bitmap.GetSize() << "->" << targetSize); + sk_sp<SkImage> image = makeCheckedImageSnapshot(tmpSurface); + addCachedImage(key, image); + return image; +} + +OString SkiaSalGraphicsImpl::makeCachedImageKey(const SkiaSalBitmap& bitmap, + const SkiaSalBitmap* alphaBitmap, + const Size& targetSize, DirectImage bitmapType, + DirectImage alphaBitmapType) +{ + OString key = OString::number(targetSize.Width()) + "x" + OString::number(targetSize.Height()) + + "_" + bitmap.GetImageKey(bitmapType); + if (alphaBitmap) + key += "_" + alphaBitmap->GetAlphaImageKey(alphaBitmapType); + return key; +} + +bool SkiaSalGraphicsImpl::drawAlphaBitmap(const SalTwoRect& rPosAry, const SalBitmap& rSourceBitmap, + const SalBitmap& rAlphaBitmap) +{ + assert(dynamic_cast<const SkiaSalBitmap*>(&rSourceBitmap)); + assert(dynamic_cast<const SkiaSalBitmap*>(&rAlphaBitmap)); + const SkiaSalBitmap& rSkiaSourceBitmap = static_cast<const SkiaSalBitmap&>(rSourceBitmap); + const SkiaSalBitmap& rSkiaAlphaBitmap = static_cast<const SkiaSalBitmap&>(rAlphaBitmap); + // Use mergeCacheBitmaps(), which may decide to cache the result, avoiding repeated + // alpha blending or scaling. + SalTwoRect imagePosAry(rPosAry); + Size imageSize = rSourceBitmap.GetSize(); + // If the bitmap will be scaled, prefer to do it in mergeCacheBitmaps(), if possible. + if ((rPosAry.mnSrcWidth != rPosAry.mnDestWidth || rPosAry.mnSrcHeight != rPosAry.mnDestHeight) + && rPosAry.mnSrcX == 0 && rPosAry.mnSrcY == 0 + && rPosAry.mnSrcWidth == rSourceBitmap.GetSize().Width() + && rPosAry.mnSrcHeight == rSourceBitmap.GetSize().Height()) + { + imagePosAry.mnSrcWidth = imagePosAry.mnDestWidth; + imagePosAry.mnSrcHeight = imagePosAry.mnDestHeight; + imageSize = Size(imagePosAry.mnSrcWidth, imagePosAry.mnSrcHeight); + } + sk_sp<SkImage> image + = mergeCacheBitmaps(rSkiaSourceBitmap, &rSkiaAlphaBitmap, imageSize * mScaling); + if (image) + drawImage(imagePosAry, image, mScaling); + else if (rSkiaAlphaBitmap.IsFullyOpaqueAsAlpha() + && !rSkiaSourceBitmap.PreferSkShader()) // alpha can be ignored + drawBitmap(rPosAry, rSkiaSourceBitmap); + else + drawShader(rPosAry, + SkShaders::Blend( + SkBlendMode::kDstOut, // VCL alpha is one-minus-alpha. + rSkiaSourceBitmap.GetSkShader(makeSamplingOptions(rPosAry, mScaling)), + rSkiaAlphaBitmap.GetAlphaSkShader(makeSamplingOptions(rPosAry, mScaling)))); + return true; +} + +void SkiaSalGraphicsImpl::drawBitmap(const SalTwoRect& rPosAry, const SkiaSalBitmap& bitmap, + SkBlendMode blendMode) +{ + // Use mergeCacheBitmaps(), which may decide to cache the result, avoiding repeated + // scaling. + SalTwoRect imagePosAry(rPosAry); + Size imageSize = bitmap.GetSize(); + // If the bitmap will be scaled, prefer to do it in mergeCacheBitmaps(), if possible. + if ((rPosAry.mnSrcWidth != rPosAry.mnDestWidth || rPosAry.mnSrcHeight != rPosAry.mnDestHeight) + && rPosAry.mnSrcX == 0 && rPosAry.mnSrcY == 0 + && rPosAry.mnSrcWidth == bitmap.GetSize().Width() + && rPosAry.mnSrcHeight == bitmap.GetSize().Height()) + { + imagePosAry.mnSrcWidth = imagePosAry.mnDestWidth; + imagePosAry.mnSrcHeight = imagePosAry.mnDestHeight; + imageSize = Size(imagePosAry.mnSrcWidth, imagePosAry.mnSrcHeight); + } + sk_sp<SkImage> image = mergeCacheBitmaps(bitmap, nullptr, imageSize * mScaling); + if (image) + drawImage(imagePosAry, image, mScaling, blendMode); + else if (bitmap.PreferSkShader()) + drawShader(rPosAry, bitmap.GetSkShader(makeSamplingOptions(rPosAry, mScaling)), blendMode); + else + drawImage(rPosAry, bitmap.GetSkImage(), 1, blendMode); +} + +void SkiaSalGraphicsImpl::drawImage(const SalTwoRect& rPosAry, const sk_sp<SkImage>& aImage, + int srcScaling, SkBlendMode eBlendMode) +{ + SkRect aSourceRect + = SkRect::MakeXYWH(rPosAry.mnSrcX, rPosAry.mnSrcY, rPosAry.mnSrcWidth, rPosAry.mnSrcHeight); + if (srcScaling != 1) + aSourceRect = scaleRect(aSourceRect, srcScaling); + SkRect aDestinationRect = SkRect::MakeXYWH(rPosAry.mnDestX, rPosAry.mnDestY, + rPosAry.mnDestWidth, rPosAry.mnDestHeight); + + SkPaint aPaint = makeBitmapPaint(); + aPaint.setBlendMode(eBlendMode); + + preDraw(); + SAL_INFO("vcl.skia.trace", + "drawimage(" << this << "): " << rPosAry << ":" << SkBlendMode_Name(eBlendMode)); + addUpdateRegion(aDestinationRect); + getDrawCanvas()->drawImageRect(aImage, aSourceRect, aDestinationRect, + makeSamplingOptions(rPosAry, mScaling, srcScaling), &aPaint, + SkCanvas::kFast_SrcRectConstraint); + ++pendingOperationsToFlush; // tdf#136369 + postDraw(); +} + +// SkShader can be used to merge multiple bitmaps with appropriate blend modes (e.g. when +// merging a bitmap with its alpha mask). +void SkiaSalGraphicsImpl::drawShader(const SalTwoRect& rPosAry, const sk_sp<SkShader>& shader, + SkBlendMode blendMode) +{ + preDraw(); + SAL_INFO("vcl.skia.trace", "drawshader(" << this << "): " << rPosAry); + SkRect destinationRect = SkRect::MakeXYWH(rPosAry.mnDestX, rPosAry.mnDestY, rPosAry.mnDestWidth, + rPosAry.mnDestHeight); + addUpdateRegion(destinationRect); + SkPaint paint = makeBitmapPaint(); + paint.setBlendMode(blendMode); + paint.setShader(shader); + SkCanvas* canvas = getDrawCanvas(); + // Scaling needs to be done explicitly using a matrix. + SkAutoCanvasRestore autoRestore(canvas, true); + SkMatrix matrix = SkMatrix::Translate(rPosAry.mnDestX, rPosAry.mnDestY) + * SkMatrix::Scale(1.0 * rPosAry.mnDestWidth / rPosAry.mnSrcWidth, + 1.0 * rPosAry.mnDestHeight / rPosAry.mnSrcHeight) + * SkMatrix::Translate(-rPosAry.mnSrcX, -rPosAry.mnSrcY); +#ifndef NDEBUG + // Handle floating point imprecisions, round p1 to 2 decimal places. + auto compareRounded = [](const SkPoint& p1, const SkPoint& p2) { + return rtl::math::round(p1.x(), 2) == p2.x() && rtl::math::round(p1.y(), 2) == p2.y(); + }; +#endif + assert(compareRounded(matrix.mapXY(rPosAry.mnSrcX, rPosAry.mnSrcY), + SkPoint::Make(rPosAry.mnDestX, rPosAry.mnDestY))); + assert(compareRounded( + matrix.mapXY(rPosAry.mnSrcX + rPosAry.mnSrcWidth, rPosAry.mnSrcY + rPosAry.mnSrcHeight), + SkPoint::Make(rPosAry.mnDestX + rPosAry.mnDestWidth, + rPosAry.mnDestY + rPosAry.mnDestHeight))); + canvas->concat(matrix); + SkRect sourceRect + = SkRect::MakeXYWH(rPosAry.mnSrcX, rPosAry.mnSrcY, rPosAry.mnSrcWidth, rPosAry.mnSrcHeight); + canvas->drawRect(sourceRect, paint); + postDraw(); +} + +bool SkiaSalGraphicsImpl::hasFastDrawTransformedBitmap() const +{ + // Return true even in raster mode, even that way Skia is faster than e.g. GraphicObject + // trying to handle stuff manually. + return true; +} + +// Whether applying matrix needs image smoothing for the transformation. +static bool matrixNeedsHighQuality(const SkMatrix& matrix) +{ + if (matrix.isIdentity()) + return false; + if (matrix.isScaleTranslate()) + { + if (abs(matrix.getScaleX()) == 1 && abs(matrix.getScaleY()) == 1) + return false; // Only at most flipping and keeping the size. + return true; + } + assert(!matrix.hasPerspective()); // we do not use this + if (matrix.getScaleX() == 0 && matrix.getScaleY() == 0) + { + // Rotating 90 or 270 degrees while keeping the size. + if ((matrix.getSkewX() == 1 && matrix.getSkewY() == -1) + || (matrix.getSkewX() == -1 && matrix.getSkewY() == 1)) + return false; + } + return true; +} + +namespace SkiaTests +{ +bool matrixNeedsHighQuality(const SkMatrix& matrix) { return ::matrixNeedsHighQuality(matrix); } +} + +bool SkiaSalGraphicsImpl::drawTransformedBitmap(const basegfx::B2DPoint& rNull, + const basegfx::B2DPoint& rX, + const basegfx::B2DPoint& rY, + const SalBitmap& rSourceBitmap, + const SalBitmap* pAlphaBitmap, double fAlpha) +{ + assert(dynamic_cast<const SkiaSalBitmap*>(&rSourceBitmap)); + assert(!pAlphaBitmap || dynamic_cast<const SkiaSalBitmap*>(pAlphaBitmap)); + + const SkiaSalBitmap& rSkiaBitmap = static_cast<const SkiaSalBitmap&>(rSourceBitmap); + const SkiaSalBitmap* pSkiaAlphaBitmap = static_cast<const SkiaSalBitmap*>(pAlphaBitmap); + + if (pSkiaAlphaBitmap && pSkiaAlphaBitmap->IsFullyOpaqueAsAlpha()) + pSkiaAlphaBitmap = nullptr; // the alpha can be ignored + + // Setup the image transformation, + // using the rNull, rX, rY points as destinations for the (0,0), (Width,0), (0,Height) source points. + const basegfx::B2DVector aXRel = rX - rNull; + const basegfx::B2DVector aYRel = rY - rNull; + + preDraw(); + SAL_INFO("vcl.skia.trace", "drawtransformedbitmap(" << this << "): " << rSourceBitmap.GetSize() + << " " << rNull << ":" << rX << ":" << rY); + + addUpdateRegion(SkRect::MakeWH(GetWidth(), GetHeight())); // can't tell, use whole area + // Use mergeCacheBitmaps(), which may decide to cache the result, avoiding repeated + // alpha blending or scaling. + // The extra fAlpha blending is not cached, with the assumption that it usually gradually changes + // for each invocation. + // Pass size * mScaling to mergeCacheBitmaps() so that it prepares the size that will be needed + // after the mScaling-scaling matrix, but otherwise calculate everything else using the VCL coordinates. + Size imageSize(round(aXRel.getLength()), round(aYRel.getLength())); + sk_sp<SkImage> imageToDraw + = mergeCacheBitmaps(rSkiaBitmap, pSkiaAlphaBitmap, imageSize * mScaling); + if (imageToDraw) + { + SkMatrix matrix; + // Round sizes for scaling, so that sub-pixel differences don't + // trigger unnecessary scaling. Image has already been scaled + // by mergeCacheBitmaps() and we shouldn't scale here again + // unless the drawing is also skewed. + matrix.set(SkMatrix::kMScaleX, round(aXRel.getX()) / imageSize.Width()); + matrix.set(SkMatrix::kMScaleY, round(aYRel.getY()) / imageSize.Height()); + matrix.set(SkMatrix::kMSkewY, aXRel.getY() / imageSize.Width()); + matrix.set(SkMatrix::kMSkewX, aYRel.getX() / imageSize.Height()); + matrix.set(SkMatrix::kMTransX, rNull.getX()); + matrix.set(SkMatrix::kMTransY, rNull.getY()); + SkCanvas* canvas = getDrawCanvas(); + SkAutoCanvasRestore autoRestore(canvas, true); + canvas->concat(matrix); + SkSamplingOptions samplingOptions; + // If the matrix changes geometry, we need to smooth-scale. If there's mScaling, + // that's already been handled by mergeCacheBitmaps(). + if (matrixNeedsHighQuality(matrix)) + samplingOptions = makeSamplingOptions(matrix, 1); + if (fAlpha == 1.0) + { + // Specify sizes to scale the image size back if needed (because of mScaling). + SkRect dstRect = SkRect::MakeWH(imageSize.Width(), imageSize.Height()); + SkRect srcRect = SkRect::MakeWH(imageToDraw->width(), imageToDraw->height()); + SkPaint paint = makeBitmapPaint(); + canvas->drawImageRect(imageToDraw, srcRect, dstRect, samplingOptions, &paint, + SkCanvas::kFast_SrcRectConstraint); + } + else + { + SkPaint paint = makeBitmapPaint(); + // Scale the image size back if needed. + SkMatrix scale = SkMatrix::Scale(1.0 / mScaling, 1.0 / mScaling); + paint.setShader(SkShaders::Blend( + SkBlendMode::kDstIn, imageToDraw->makeShader(samplingOptions, &scale), + SkShaders::Color(SkColorSetARGB(fAlpha * 255, 0, 0, 0)))); + canvas->drawRect(SkRect::MakeWH(imageSize.Width(), imageSize.Height()), paint); + } + } + else + { + SkMatrix matrix; + const Size aSize = rSourceBitmap.GetSize(); + matrix.set(SkMatrix::kMScaleX, aXRel.getX() / aSize.Width()); + matrix.set(SkMatrix::kMScaleY, aYRel.getY() / aSize.Height()); + matrix.set(SkMatrix::kMSkewY, aXRel.getY() / aSize.Width()); + matrix.set(SkMatrix::kMSkewX, aYRel.getX() / aSize.Height()); + matrix.set(SkMatrix::kMTransX, rNull.getX()); + matrix.set(SkMatrix::kMTransY, rNull.getY()); + SkCanvas* canvas = getDrawCanvas(); + SkAutoCanvasRestore autoRestore(canvas, true); + canvas->concat(matrix); + SkSamplingOptions samplingOptions; + if (matrixNeedsHighQuality(matrix) || (mScaling != 1 && !isUnitTestRunning())) + samplingOptions = makeSamplingOptions(matrix, mScaling); + if (pSkiaAlphaBitmap) + { + SkPaint paint = makeBitmapPaint(); + paint.setShader(SkShaders::Blend(SkBlendMode::kDstOut, // VCL alpha is one-minus-alpha. + rSkiaBitmap.GetSkShader(samplingOptions), + pSkiaAlphaBitmap->GetAlphaSkShader(samplingOptions))); + if (fAlpha != 1.0) + paint.setShader( + SkShaders::Blend(SkBlendMode::kDstIn, paint.refShader(), + SkShaders::Color(SkColorSetARGB(fAlpha * 255, 0, 0, 0)))); + canvas->drawRect(SkRect::MakeWH(aSize.Width(), aSize.Height()), paint); + } + else if (rSkiaBitmap.PreferSkShader() || fAlpha != 1.0) + { + SkPaint paint = makeBitmapPaint(); + paint.setShader(rSkiaBitmap.GetSkShader(samplingOptions)); + if (fAlpha != 1.0) + paint.setShader( + SkShaders::Blend(SkBlendMode::kDstIn, paint.refShader(), + SkShaders::Color(SkColorSetARGB(fAlpha * 255, 0, 0, 0)))); + canvas->drawRect(SkRect::MakeWH(aSize.Width(), aSize.Height()), paint); + } + else + { + SkPaint paint = makeBitmapPaint(); + canvas->drawImage(rSkiaBitmap.GetSkImage(), 0, 0, samplingOptions, &paint); + } + } + postDraw(); + return true; +} + +bool SkiaSalGraphicsImpl::drawAlphaRect(tools::Long nX, tools::Long nY, tools::Long nWidth, + tools::Long nHeight, sal_uInt8 nTransparency) +{ + privateDrawAlphaRect(nX, nY, nWidth, nHeight, nTransparency / 100.0); + return true; +} + +bool SkiaSalGraphicsImpl::drawGradient(const tools::PolyPolygon& rPolyPolygon, + const Gradient& rGradient) +{ + if (rGradient.GetStyle() != GradientStyle::Linear + && rGradient.GetStyle() != GradientStyle::Axial + && rGradient.GetStyle() != GradientStyle::Radial) + return false; // unsupported + if (rGradient.GetSteps() != 0) + return false; // We can't tell Skia how many colors to use in the gradient. + preDraw(); + SAL_INFO("vcl.skia.trace", "drawgradient(" << this << "): " << rPolyPolygon.getB2DPolyPolygon() + << ":" << static_cast<int>(rGradient.GetStyle())); + tools::Rectangle boundRect(rPolyPolygon.GetBoundRect()); + if (boundRect.IsEmpty()) + return true; + SkPath path; + if (rPolyPolygon.IsRect()) + { + // Rect->Polygon conversion loses the right and bottom edge, fix that. + path.addRect(SkRect::MakeXYWH(boundRect.getX(), boundRect.getY(), boundRect.GetWidth(), + boundRect.GetHeight())); + boundRect.AdjustRight(1); + boundRect.AdjustBottom(1); + } + else + addPolyPolygonToPath(rPolyPolygon.getB2DPolyPolygon(), path); + path.setFillType(SkPathFillType::kEvenOdd); + addUpdateRegion(path.getBounds()); + + Gradient aGradient(rGradient); + tools::Rectangle aBoundRect; + Point aCenter; + aGradient.SetAngle(aGradient.GetAngle() + 2700_deg10); + aGradient.GetBoundRect(boundRect, aBoundRect, aCenter); + + SkColor startColor + = toSkColorWithIntensity(rGradient.GetStartColor(), rGradient.GetStartIntensity()); + SkColor endColor = toSkColorWithIntensity(rGradient.GetEndColor(), rGradient.GetEndIntensity()); + + sk_sp<SkShader> shader; + if (rGradient.GetStyle() == GradientStyle::Linear) + { + tools::Polygon aPoly(aBoundRect); + aPoly.Rotate(aCenter, aGradient.GetAngle() % 3600_deg10); + SkPoint points[2] = { SkPoint::Make(toSkX(aPoly[0].X()), toSkY(aPoly[0].Y())), + SkPoint::Make(toSkX(aPoly[1].X()), toSkY(aPoly[1].Y())) }; + SkColor colors[2] = { startColor, endColor }; + SkScalar pos[2] = { SkDoubleToScalar(aGradient.GetBorder() / 100.0), 1.0 }; + shader = SkGradientShader::MakeLinear(points, colors, pos, 2, SkTileMode::kClamp); + } + else if (rGradient.GetStyle() == GradientStyle::Axial) + { + tools::Polygon aPoly(aBoundRect); + aPoly.Rotate(aCenter, aGradient.GetAngle() % 3600_deg10); + SkPoint points[2] = { SkPoint::Make(toSkX(aPoly[0].X()), toSkY(aPoly[0].Y())), + SkPoint::Make(toSkX(aPoly[1].X()), toSkY(aPoly[1].Y())) }; + SkColor colors[3] = { endColor, startColor, endColor }; + SkScalar border = SkDoubleToScalar(aGradient.GetBorder() / 100.0); + SkScalar pos[3] + = { std::min<SkScalar>(border, 0.5), 0.5, std::max<SkScalar>(1 - border, 0.5) }; + shader = SkGradientShader::MakeLinear(points, colors, pos, 3, SkTileMode::kClamp); + } + else + { + // Move the center by (-1,-1) (the default VCL algorithm is a bit off-center that way, + // Skia is the opposite way). + SkPoint center = SkPoint::Make(toSkX(aCenter.X()) - 1, toSkY(aCenter.Y()) - 1); + SkScalar radius = std::max(aBoundRect.GetWidth() / 2.0, aBoundRect.GetHeight() / 2.0); + SkColor colors[2] = { endColor, startColor }; + SkScalar pos[2] = { SkDoubleToScalar(aGradient.GetBorder() / 100.0), 1.0 }; + shader = SkGradientShader::MakeRadial(center, radius, colors, pos, 2, SkTileMode::kClamp); + } + + SkPaint paint = makeGradientPaint(); + paint.setAntiAlias(mParent.getAntiAlias()); + paint.setShader(shader); + getDrawCanvas()->drawPath(path, paint); + postDraw(); + return true; +} + +bool SkiaSalGraphicsImpl::implDrawGradient(const basegfx::B2DPolyPolygon& rPolyPolygon, + const SalGradient& rGradient) +{ + preDraw(); + SAL_INFO("vcl.skia.trace", + "impldrawgradient(" << this << "): " << rPolyPolygon << ":" << rGradient.maPoint1 + << "->" << rGradient.maPoint2 << ":" << rGradient.maStops.size()); + + SkPath path; + addPolyPolygonToPath(rPolyPolygon, path); + path.setFillType(SkPathFillType::kEvenOdd); + addUpdateRegion(path.getBounds()); + + SkPoint points[2] + = { SkPoint::Make(toSkX(rGradient.maPoint1.getX()), toSkY(rGradient.maPoint1.getY())), + SkPoint::Make(toSkX(rGradient.maPoint2.getX()), toSkY(rGradient.maPoint2.getY())) }; + std::vector<SkColor> colors; + std::vector<SkScalar> pos; + for (const SalGradientStop& stop : rGradient.maStops) + { + colors.emplace_back(toSkColor(stop.maColor)); + pos.emplace_back(stop.mfOffset); + } + sk_sp<SkShader> shader = SkGradientShader::MakeLinear(points, colors.data(), pos.data(), + colors.size(), SkTileMode::kDecal); + SkPaint paint = makeGradientPaint(); + paint.setAntiAlias(mParent.getAntiAlias()); + paint.setShader(shader); + getDrawCanvas()->drawPath(path, paint); + postDraw(); + return true; +} + +static double toRadian(Degree10 degree10th) { return toRadians(3600_deg10 - degree10th); } +static double toCos(Degree10 degree10th) { return SkScalarCos(toRadian(degree10th)); } +static double toSin(Degree10 degree10th) { return SkScalarSin(toRadian(degree10th)); } + +void SkiaSalGraphicsImpl::drawGenericLayout(const GenericSalLayout& layout, Color textColor, + const SkFont& font, const SkFont& verticalFont) +{ + SkiaZone zone; + std::vector<SkGlyphID> glyphIds; + std::vector<SkRSXform> glyphForms; + std::vector<bool> verticals; + glyphIds.reserve(256); + glyphForms.reserve(256); + verticals.reserve(256); + DevicePoint aPos; + const GlyphItem* pGlyph; + int nStart = 0; + while (layout.GetNextGlyph(&pGlyph, aPos, nStart)) + { + glyphIds.push_back(pGlyph->glyphId()); + Degree10 angle = layout.GetOrientation(); + if (pGlyph->IsVertical()) + angle += 900_deg10; + SkRSXform form = SkRSXform::Make(toCos(angle), toSin(angle), aPos.getX(), aPos.getY()); + glyphForms.emplace_back(std::move(form)); + verticals.emplace_back(pGlyph->IsVertical()); + } + if (glyphIds.empty()) + return; + + preDraw(); + auto getBoundRect = [&layout]() { + tools::Rectangle rect; + layout.GetBoundRect(rect); + return rect; + }; + SAL_INFO("vcl.skia.trace", "drawtextblob(" << this << "): " << getBoundRect() << ", " + << glyphIds.size() << " glyphs, " << textColor); + + // Vertical glyphs need a different font, so split drawing into runs that each + // draw only consecutive horizontal or vertical glyphs. + std::vector<bool>::const_iterator pos = verticals.cbegin(); + std::vector<bool>::const_iterator end = verticals.cend(); + while (pos != end) + { + bool verticalRun = *pos; + std::vector<bool>::const_iterator rangeEnd = std::find(pos + 1, end, !verticalRun); + size_t index = pos - verticals.cbegin(); + size_t count = rangeEnd - pos; + sk_sp<SkTextBlob> textBlob = SkTextBlob::MakeFromRSXform( + glyphIds.data() + index, count * sizeof(SkGlyphID), glyphForms.data() + index, + verticalRun ? verticalFont : font, SkTextEncoding::kGlyphID); + addUpdateRegion(textBlob->bounds()); + SkPaint paint = makeTextPaint(textColor); + getDrawCanvas()->drawTextBlob(textBlob, 0, 0, paint); + pos = rangeEnd; + } + postDraw(); +} + +bool SkiaSalGraphicsImpl::supportsOperation(OutDevSupportType eType) const +{ + switch (eType) + { + case OutDevSupportType::B2DDraw: + case OutDevSupportType::TransparentRect: + return true; + default: + return false; + } +} + +static int getScaling() +{ + // It makes sense to support the debugging flag on all platforms + // for unittests purpose, even if the actual windows cannot do it. + if (const char* env = getenv("SAL_FORCE_HIDPI_SCALING")) + return atoi(env); + return 1; +} + +int SkiaSalGraphicsImpl::getWindowScaling() const +{ + static const int scaling = getScaling(); + return scaling; +} + +void SkiaSalGraphicsImpl::dump(const char* file) const +{ + assert(mSurface.get()); + SkiaHelper::dump(mSurface, file); +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |