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tenfourfox/gfx/thebes/gfxContext.cpp

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <math.h>
#include "mozilla/Alignment.h"
#include "cairo.h"
#include "gfxContext.h"
#include "gfxMatrix.h"
#include "gfxUtils.h"
#include "gfxASurface.h"
#include "gfxPattern.h"
#include "gfxPlatform.h"
#include "gfxTeeSurface.h"
#include "GeckoProfiler.h"
#include "gfx2DGlue.h"
#include "mozilla/gfx/PathHelpers.h"
#include "mozilla/gfx/DrawTargetTiled.h"
#include <algorithm>
#if XP_WIN
#include "gfxWindowsPlatform.h"
#endif
using namespace mozilla;
using namespace mozilla::gfx;
UserDataKey gfxContext::sDontUseAsSourceKey;
PatternFromState::operator mozilla::gfx::Pattern&()
{
gfxContext::AzureState &state = mContext->CurrentState();
if (state.pattern) {
return *state.pattern->GetPattern(mContext->mDT, state.patternTransformChanged ? &state.patternTransform : nullptr);
}
if (state.sourceSurface) {
Matrix transform = state.surfTransform;
if (state.patternTransformChanged) {
Matrix mat = mContext->GetDTTransform();
if (!mat.Invert()) {
mPattern = new (mColorPattern.addr())
ColorPattern(Color()); // transparent black to paint nothing
return *mPattern;
}
transform = transform * state.patternTransform * mat;
}
mPattern = new (mSurfacePattern.addr())
SurfacePattern(state.sourceSurface, ExtendMode::CLAMP, transform);
return *mPattern;
}
mPattern = new (mColorPattern.addr())
ColorPattern(state.color);
return *mPattern;
}
gfxContext::gfxContext(DrawTarget *aTarget, const Point& aDeviceOffset)
: mPathIsRect(false)
, mTransformChanged(false)
, mRefCairo(nullptr)
, mDT(aTarget)
, mOriginalDT(aTarget)
{
MOZ_ASSERT(aTarget, "Don't create a gfxContext without a DrawTarget");
MOZ_COUNT_CTOR(gfxContext);
mStateStack.SetLength(1);
CurrentState().drawTarget = mDT;
CurrentState().deviceOffset = aDeviceOffset;
mDT->SetTransform(GetDTTransform());
}
/* static */ already_AddRefed<gfxContext>
gfxContext::ContextForDrawTarget(DrawTarget* aTarget)
{
if (!aTarget || !aTarget->IsValid()) {
gfxWarning() << "Invalid target in gfxContext::ContextForDrawTarget";
return nullptr;
}
Matrix transform = aTarget->GetTransform();
RefPtr<gfxContext> result = new gfxContext(aTarget);
result->SetMatrix(ThebesMatrix(transform));
return result.forget();
}
gfxContext::~gfxContext()
{
if (mRefCairo) {
cairo_destroy(mRefCairo);
}
for (int i = mStateStack.Length() - 1; i >= 0; i--) {
for (unsigned int c = 0; c < mStateStack[i].pushedClips.Length(); c++) {
mDT->PopClip();
}
}
mDT->Flush();
MOZ_COUNT_DTOR(gfxContext);
}
already_AddRefed<gfxASurface>
gfxContext::CurrentSurface(gfxFloat *dx, gfxFloat *dy)
{
if (mDT->GetBackendType() == BackendType::CAIRO) {
cairo_surface_t *s =
(cairo_surface_t*)mDT->GetNativeSurface(NativeSurfaceType::CAIRO_SURFACE);
if (s) {
if (dx && dy) {
*dx = -CurrentState().deviceOffset.x;
*dy = -CurrentState().deviceOffset.y;
}
return gfxASurface::Wrap(s);
}
}
if (dx && dy) {
*dx = *dy = 0;
}
// An Azure context doesn't have a surface backing it.
return nullptr;
}
cairo_t *
gfxContext::GetCairo()
{
if (mDT->GetBackendType() == BackendType::CAIRO) {
cairo_t *ctx =
(cairo_t*)mDT->GetNativeSurface(NativeSurfaceType::CAIRO_CONTEXT);
if (ctx) {
return ctx;
}
}
if (mRefCairo) {
// Set transform!
return mRefCairo;
}
mRefCairo = cairo_create(gfxPlatform::GetPlatform()->ScreenReferenceSurface()->CairoSurface());
return mRefCairo;
}
void
gfxContext::Save()
{
CurrentState().transform = mTransform;
mStateStack.AppendElement(AzureState(CurrentState()));
CurrentState().pushedClips.Clear();
}
void
gfxContext::Restore()
{
for (unsigned int c = 0; c < CurrentState().pushedClips.Length(); c++) {
mDT->PopClip();
}
mStateStack.RemoveElementAt(mStateStack.Length() - 1);
mDT = CurrentState().drawTarget;
ChangeTransform(CurrentState().transform, false);
}
// drawing
void
gfxContext::NewPath()
{
mPath = nullptr;
mPathBuilder = nullptr;
mPathIsRect = false;
mTransformChanged = false;
}
void
gfxContext::ClosePath()
{
EnsurePathBuilder();
mPathBuilder->Close();
}
already_AddRefed<Path> gfxContext::GetPath()
{
EnsurePath();
RefPtr<Path> path(mPath);
return path.forget();
}
void gfxContext::SetPath(Path* path)
{
MOZ_ASSERT(path->GetBackendType() == mDT->GetBackendType() ||
(mDT->GetBackendType() == BackendType::DIRECT2D1_1 && path->GetBackendType() == BackendType::DIRECT2D));
mPath = path;
mPathBuilder = nullptr;
mPathIsRect = false;
mTransformChanged = false;
}
gfxPoint
gfxContext::CurrentPoint()
{
EnsurePathBuilder();
return ThebesPoint(mPathBuilder->CurrentPoint());
}
void
gfxContext::Fill()
{
Fill(PatternFromState(this));
}
void
gfxContext::Fill(const Pattern& aPattern)
{
PROFILER_LABEL("gfxContext", "Fill",
js::ProfileEntry::Category::GRAPHICS);
FillAzure(aPattern, 1.0f);
}
void
gfxContext::MoveTo(const gfxPoint& pt)
{
EnsurePathBuilder();
mPathBuilder->MoveTo(ToPoint(pt));
}
void
gfxContext::LineTo(const gfxPoint& pt)
{
EnsurePathBuilder();
mPathBuilder->LineTo(ToPoint(pt));
}
void
gfxContext::Line(const gfxPoint& start, const gfxPoint& end)
{
EnsurePathBuilder();
mPathBuilder->MoveTo(ToPoint(start));
mPathBuilder->LineTo(ToPoint(end));
}
// XXX snapToPixels is only valid when snapping for filled
// rectangles and for even-width stroked rectangles.
// For odd-width stroked rectangles, we need to offset x/y by
// 0.5...
void
gfxContext::Rectangle(const gfxRect& rect, bool snapToPixels)
{
Rect rec = ToRect(rect);
if (snapToPixels) {
gfxRect newRect(rect);
if (UserToDevicePixelSnapped(newRect, true)) {
gfxMatrix mat = ThebesMatrix(mTransform);
if (mat.Invert()) {
// We need the user space rect.
rec = ToRect(mat.TransformBounds(newRect));
} else {
rec = Rect();
}
}
}
if (!mPathBuilder && !mPathIsRect) {
mPathIsRect = true;
mRect = rec;
return;
}
EnsurePathBuilder();
mPathBuilder->MoveTo(rec.TopLeft());
mPathBuilder->LineTo(rec.TopRight());
mPathBuilder->LineTo(rec.BottomRight());
mPathBuilder->LineTo(rec.BottomLeft());
mPathBuilder->Close();
}
// transform stuff
void
gfxContext::Multiply(const gfxMatrix& matrix)
{
ChangeTransform(ToMatrix(matrix) * mTransform);
}
void
gfxContext::SetMatrix(const gfxMatrix& matrix)
{
ChangeTransform(ToMatrix(matrix));
}
gfxMatrix
gfxContext::CurrentMatrix() const
{
return ThebesMatrix(mTransform);
}
gfxPoint
gfxContext::DeviceToUser(const gfxPoint& point) const
{
Matrix matrix = mTransform;
matrix.Invert();
return ThebesPoint(matrix * ToPoint(point));
}
Size
gfxContext::DeviceToUser(const Size& size) const
{
Matrix matrix = mTransform;
matrix.Invert();
return matrix * size;
}
gfxRect
gfxContext::DeviceToUser(const gfxRect& rect) const
{
Matrix matrix = mTransform;
matrix.Invert();
return ThebesRect(matrix.TransformBounds(ToRect(rect)));
}
gfxPoint
gfxContext::UserToDevice(const gfxPoint& point) const
{
return ThebesPoint(mTransform * ToPoint(point));
}
Size
gfxContext::UserToDevice(const Size& size) const
{
const Matrix &matrix = mTransform;
Size newSize;
newSize.width = size.width * matrix._11 + size.height * matrix._12;
newSize.height = size.width * matrix._21 + size.height * matrix._22;
return newSize;
}
gfxRect
gfxContext::UserToDevice(const gfxRect& rect) const
{
const Matrix &matrix = mTransform;
return ThebesRect(matrix.TransformBounds(ToRect(rect)));
}
bool
gfxContext::UserToDevicePixelSnapped(gfxRect& rect, bool ignoreScale) const
{
if (mDT->GetUserData(&sDisablePixelSnapping))
return false;
// if we're not at 1.0 scale, don't snap, unless we're
// ignoring the scale. If we're not -just- a scale,
// never snap.
const gfxFloat epsilon = 0.0000001;
#define WITHIN_E(a,b) (fabs((a)-(b)) < epsilon)
Matrix mat = mTransform;
if (!ignoreScale &&
(!WITHIN_E(mat._11,1.0) || !WITHIN_E(mat._22,1.0) ||
!WITHIN_E(mat._12,0.0) || !WITHIN_E(mat._21,0.0)))
return false;
#undef WITHIN_E
gfxPoint p1 = UserToDevice(rect.TopLeft());
gfxPoint p2 = UserToDevice(rect.TopRight());
gfxPoint p3 = UserToDevice(rect.BottomRight());
// Check that the rectangle is axis-aligned. For an axis-aligned rectangle,
// two opposite corners define the entire rectangle. So check if
// the axis-aligned rectangle with opposite corners p1 and p3
// define an axis-aligned rectangle whose other corners are p2 and p4.
// We actually only need to check one of p2 and p4, since an affine
// transform maps parallelograms to parallelograms.
if (p2 == gfxPoint(p1.x, p3.y) || p2 == gfxPoint(p3.x, p1.y)) {
p1.Round();
p3.Round();
rect.MoveTo(gfxPoint(std::min(p1.x, p3.x), std::min(p1.y, p3.y)));
rect.SizeTo(gfxSize(std::max(p1.x, p3.x) - rect.X(),
std::max(p1.y, p3.y) - rect.Y()));
return true;
}
return false;
}
bool
gfxContext::UserToDevicePixelSnapped(gfxPoint& pt, bool ignoreScale) const
{
if (mDT->GetUserData(&sDisablePixelSnapping))
return false;
// if we're not at 1.0 scale, don't snap, unless we're
// ignoring the scale. If we're not -just- a scale,
// never snap.
const gfxFloat epsilon = 0.0000001;
#define WITHIN_E(a,b) (fabs((a)-(b)) < epsilon)
Matrix mat = mTransform;
if (!ignoreScale &&
(!WITHIN_E(mat._11,1.0) || !WITHIN_E(mat._22,1.0) ||
!WITHIN_E(mat._12,0.0) || !WITHIN_E(mat._21,0.0)))
return false;
#undef WITHIN_E
pt = UserToDevice(pt);
pt.Round();
return true;
}
void
gfxContext::SetAntialiasMode(AntialiasMode mode)
{
CurrentState().aaMode = mode;
}
AntialiasMode
gfxContext::CurrentAntialiasMode() const
{
return CurrentState().aaMode;
}
void
gfxContext::SetDash(gfxFloat *dashes, int ndash, gfxFloat offset)
{
AzureState &state = CurrentState();
state.dashPattern.SetLength(ndash);
for (int i = 0; i < ndash; i++) {
state.dashPattern[i] = Float(dashes[i]);
}
state.strokeOptions.mDashLength = ndash;
state.strokeOptions.mDashOffset = Float(offset);
state.strokeOptions.mDashPattern = ndash ? state.dashPattern.Elements()
: nullptr;
}
bool
gfxContext::CurrentDash(FallibleTArray<gfxFloat>& dashes, gfxFloat* offset) const
{
const AzureState &state = CurrentState();
int count = state.strokeOptions.mDashLength;
if (count <= 0 || !dashes.SetLength(count, fallible)) {
return false;
}
for (int i = 0; i < count; i++) {
dashes[i] = state.dashPattern[i];
}
*offset = state.strokeOptions.mDashOffset;
return true;
}
gfxFloat
gfxContext::CurrentDashOffset() const
{
return CurrentState().strokeOptions.mDashOffset;
}
void
gfxContext::SetLineWidth(gfxFloat width)
{
CurrentState().strokeOptions.mLineWidth = Float(width);
}
gfxFloat
gfxContext::CurrentLineWidth() const
{
return CurrentState().strokeOptions.mLineWidth;
}
void
gfxContext::SetOp(CompositionOp aOp)
{
CurrentState().op = aOp;
}
CompositionOp
gfxContext::CurrentOp() const
{
return CurrentState().op;
}
void
gfxContext::SetLineCap(CapStyle cap)
{
CurrentState().strokeOptions.mLineCap = cap;
}
CapStyle
gfxContext::CurrentLineCap() const
{
return CurrentState().strokeOptions.mLineCap;
}
void
gfxContext::SetLineJoin(JoinStyle join)
{
CurrentState().strokeOptions.mLineJoin = join;
}
JoinStyle
gfxContext::CurrentLineJoin() const
{
return CurrentState().strokeOptions.mLineJoin;
}
void
gfxContext::SetMiterLimit(gfxFloat limit)
{
CurrentState().strokeOptions.mMiterLimit = Float(limit);
}
gfxFloat
gfxContext::CurrentMiterLimit() const
{
return CurrentState().strokeOptions.mMiterLimit;
}
// clipping
void
gfxContext::Clip(const Rect& rect)
{
AzureState::PushedClip clip = { nullptr, rect, mTransform };
CurrentState().pushedClips.AppendElement(clip);
mDT->PushClipRect(rect);
NewPath();
}
void
gfxContext::Clip(const gfxRect& rect)
{
Clip(ToRect(rect));
}
void
gfxContext::Clip(Path* aPath)
{
mDT->PushClip(aPath);
AzureState::PushedClip clip = { aPath, Rect(), mTransform };
CurrentState().pushedClips.AppendElement(clip);
}
void
gfxContext::Clip()
{
if (mPathIsRect) {
MOZ_ASSERT(!mTransformChanged);
AzureState::PushedClip clip = { nullptr, mRect, mTransform };
CurrentState().pushedClips.AppendElement(clip);
mDT->PushClipRect(mRect);
} else {
EnsurePath();
mDT->PushClip(mPath);
AzureState::PushedClip clip = { mPath, Rect(), mTransform };
CurrentState().pushedClips.AppendElement(clip);
}
}
void
gfxContext::PopClip()
{
MOZ_ASSERT(CurrentState().pushedClips.Length() > 0);
CurrentState().pushedClips.RemoveElementAt(CurrentState().pushedClips.Length() - 1);
mDT->PopClip();
}
gfxRect
gfxContext::GetClipExtents()
{
Rect rect = GetAzureDeviceSpaceClipBounds();
if (rect.width == 0 || rect.height == 0) {
return gfxRect(0, 0, 0, 0);
}
Matrix mat = mTransform;
mat.Invert();
rect = mat.TransformBounds(rect);
return ThebesRect(rect);
}
bool
gfxContext::HasComplexClip() const
{
for (int i = mStateStack.Length() - 1; i >= 0; i--) {
for (unsigned int c = 0; c < mStateStack[i].pushedClips.Length(); c++) {
const AzureState::PushedClip &clip = mStateStack[i].pushedClips[c];
if (clip.path || !clip.transform.IsRectilinear()) {
return true;
}
}
}
return false;
}
bool
gfxContext::ExportClip(ClipExporter& aExporter)
{
for (unsigned int i = 0; i < mStateStack.Length(); i++) {
for (unsigned int c = 0; c < mStateStack[i].pushedClips.Length(); c++) {
AzureState::PushedClip &clip = mStateStack[i].pushedClips[c];
gfx::Matrix transform = clip.transform;
transform.PostTranslate(-GetDeviceOffset());
aExporter.BeginClip(transform);
if (clip.path) {
clip.path->StreamToSink(&aExporter);
} else {
aExporter.MoveTo(clip.rect.TopLeft());
aExporter.LineTo(clip.rect.TopRight());
aExporter.LineTo(clip.rect.BottomRight());
aExporter.LineTo(clip.rect.BottomLeft());
aExporter.Close();
}
aExporter.EndClip();
}
}
return true;
}
bool
gfxContext::ClipContainsRect(const gfxRect& aRect)
{
// Since we always return false when the clip list contains a
// non-rectangular clip or a non-rectilinear transform, our 'total' clip
// is always a rectangle if we hit the end of this function.
Rect clipBounds(0, 0, Float(mDT->GetSize().width), Float(mDT->GetSize().height));
for (unsigned int i = 0; i < mStateStack.Length(); i++) {
for (unsigned int c = 0; c < mStateStack[i].pushedClips.Length(); c++) {
AzureState::PushedClip &clip = mStateStack[i].pushedClips[c];
if (clip.path || !clip.transform.IsRectilinear()) {
// Cairo behavior is we return false if the clip contains a non-
// rectangle.
return false;
} else {
Rect clipRect = mTransform.TransformBounds(clip.rect);
clipBounds.IntersectRect(clipBounds, clipRect);
}
}
}
return clipBounds.Contains(ToRect(aRect));
}
// rendering sources
void
gfxContext::SetColor(const Color& aColor)
{
CurrentState().pattern = nullptr;
CurrentState().sourceSurfCairo = nullptr;
CurrentState().sourceSurface = nullptr;
CurrentState().color = ToDeviceColor(aColor);
}
void
gfxContext::SetDeviceColor(const Color& aColor)
{
CurrentState().pattern = nullptr;
CurrentState().sourceSurfCairo = nullptr;
CurrentState().sourceSurface = nullptr;
CurrentState().color = aColor;
}
bool
gfxContext::GetDeviceColor(Color& aColorOut)
{
if (CurrentState().sourceSurface) {
return false;
}
if (CurrentState().pattern) {
return CurrentState().pattern->GetSolidColor(aColorOut);
}
aColorOut = CurrentState().color;
return true;
}
void
gfxContext::SetSource(gfxASurface *surface, const gfxPoint& offset)
{
CurrentState().surfTransform = Matrix(1.0f, 0, 0, 1.0f, Float(offset.x), Float(offset.y));
CurrentState().pattern = nullptr;
CurrentState().patternTransformChanged = false;
// Keep the underlying cairo surface around while we keep the
// sourceSurface.
CurrentState().sourceSurfCairo = surface;
CurrentState().sourceSurface =
gfxPlatform::GetPlatform()->GetSourceSurfaceForSurface(mDT, surface);
CurrentState().color = Color(0, 0, 0, 0);
}
void
gfxContext::SetPattern(gfxPattern *pattern)
{
CurrentState().sourceSurfCairo = nullptr;
CurrentState().sourceSurface = nullptr;
CurrentState().patternTransformChanged = false;
CurrentState().pattern = pattern;
}
already_AddRefed<gfxPattern>
gfxContext::GetPattern()
{
RefPtr<gfxPattern> pat;
AzureState &state = CurrentState();
if (state.pattern) {
pat = state.pattern;
} else if (state.sourceSurface) {
NS_ASSERTION(false, "Ugh, this isn't good.");
} else {
pat = new gfxPattern(state.color);
}
return pat.forget();
}
void
gfxContext::SetFontSmoothingBackgroundColor(const Color& aColor)
{
CurrentState().fontSmoothingBackgroundColor = aColor;
}
Color
gfxContext::GetFontSmoothingBackgroundColor()
{
return CurrentState().fontSmoothingBackgroundColor;
}
// masking
void
gfxContext::Mask(SourceSurface* aSurface, Float aAlpha, const Matrix& aTransform)
{
Matrix old = mTransform;
Matrix mat = aTransform * mTransform;
ChangeTransform(mat);
mDT->MaskSurface(PatternFromState(this), aSurface, Point(),
DrawOptions(aAlpha, CurrentState().op, CurrentState().aaMode));
ChangeTransform(old);
}
void
gfxContext::Mask(gfxASurface *surface, const gfxPoint& offset)
{
PROFILER_LABEL("gfxContext", "Mask",
js::ProfileEntry::Category::GRAPHICS);
// Lifetime needs to be limited here as we may simply wrap surface's data.
RefPtr<SourceSurface> sourceSurf =
gfxPlatform::GetPlatform()->GetSourceSurfaceForSurface(mDT, surface);
if (!sourceSurf) {
return;
}
gfxPoint pt = surface->GetDeviceOffset();
Mask(sourceSurf, 1.0f, Point(offset.x - pt.x, offset.y - pt.y));
}
void
gfxContext::Mask(SourceSurface *surface, float alpha, const Point& offset)
{
// We clip here to bind to the mask surface bounds, see above.
mDT->MaskSurface(PatternFromState(this),
surface,
offset,
DrawOptions(alpha, CurrentState().op, CurrentState().aaMode));
}
void
gfxContext::Paint(gfxFloat alpha)
{
PROFILER_LABEL("gfxContext", "Paint",
js::ProfileEntry::Category::GRAPHICS);
AzureState &state = CurrentState();
if (state.sourceSurface && !state.sourceSurfCairo &&
!state.patternTransformChanged)
{
// This is the case where a PopGroupToSource has been done and this
// paint is executed without changing the transform or the source.
Matrix oldMat = mDT->GetTransform();
IntSize surfSize = state.sourceSurface->GetSize();
mDT->SetTransform(Matrix::Translation(-state.deviceOffset.x,
-state.deviceOffset.y));
mDT->DrawSurface(state.sourceSurface,
Rect(state.sourceSurfaceDeviceOffset, Size(surfSize.width, surfSize.height)),
Rect(Point(), Size(surfSize.width, surfSize.height)),
DrawSurfaceOptions(), DrawOptions(alpha, GetOp()));
mDT->SetTransform(oldMat);
return;
}
Matrix mat = mDT->GetTransform();
mat.Invert();
Rect paintRect = mat.TransformBounds(Rect(Point(0, 0), Size(mDT->GetSize())));
mDT->FillRect(paintRect, PatternFromState(this),
DrawOptions(Float(alpha), GetOp()));
}
void
gfxContext::PushGroupForBlendBack(gfxContentType content, Float aOpacity, SourceSurface* aMask, const Matrix& aMaskTransform)
{
DrawTarget* oldDT = mDT;
PushNewDT(content);
if (oldDT != mDT) {
PushClipsToDT(mDT);
}
mDT->SetTransform(GetDTTransform());
CurrentState().mBlendOpacity = aOpacity;
CurrentState().mBlendMask = aMask;
CurrentState().mWasPushedForBlendBack = true;
CurrentState().mBlendMaskTransform = aMaskTransform;
}
static gfxRect
GetRoundOutDeviceClipExtents(gfxContext* aCtx)
{
gfxContextMatrixAutoSaveRestore save(aCtx);
aCtx->SetMatrix(gfxMatrix());
gfxRect r = aCtx->GetClipExtents();
r.RoundOut();
return r;
}
void
gfxContext::PushGroupAndCopyBackground(gfxContentType content, Float aOpacity, SourceSurface* aMask, const Matrix& aMaskTransform)
{
IntRect clipExtents;
if (mDT->GetFormat() != SurfaceFormat::B8G8R8X8) {
gfxRect clipRect = GetRoundOutDeviceClipExtents(this);
clipExtents = IntRect(clipRect.x, clipRect.y, clipRect.width, clipRect.height);
}
RefPtr<SourceSurface> source;
if ((mDT->GetFormat() == SurfaceFormat::B8G8R8X8 ||
mDT->GetOpaqueRect().Contains(clipExtents)) &&
!mDT->GetUserData(&sDontUseAsSourceKey) &&
(source = mDT->Snapshot())) {
DrawTarget *oldDT = mDT;
Point oldDeviceOffset = CurrentState().deviceOffset;
PushNewDT(gfxContentType::COLOR);
if (oldDT == mDT) {
// Creating new DT failed.
return;
}
CurrentState().mBlendOpacity = aOpacity;
CurrentState().mBlendMask = aMask;
CurrentState().mWasPushedForBlendBack = true;
CurrentState().mBlendMaskTransform = aMaskTransform;
Point offset = CurrentState().deviceOffset - oldDeviceOffset;
Rect surfRect(0, 0, Float(mDT->GetSize().width), Float(mDT->GetSize().height));
Rect sourceRect = surfRect + offset;
mDT->SetTransform(Matrix());
// XXX: It's really sad that we have to do this (for performance).
// Once DrawTarget gets a PushLayer API we can implement this within
// DrawTargetTiled.
if (source->GetType() == SurfaceType::TILED) {
SnapshotTiled *sourceTiled = static_cast<SnapshotTiled*>(source.get());
for (uint32_t i = 0; i < sourceTiled->mSnapshots.size(); i++) {
Rect tileSourceRect = sourceRect.Intersect(Rect(sourceTiled->mOrigins[i].x,
sourceTiled->mOrigins[i].y,
sourceTiled->mSnapshots[i]->GetSize().width,
sourceTiled->mSnapshots[i]->GetSize().height));
if (tileSourceRect.IsEmpty()) {
continue;
}
Rect tileDestRect = tileSourceRect - offset;
tileSourceRect -= sourceTiled->mOrigins[i];
mDT->DrawSurface(sourceTiled->mSnapshots[i], tileDestRect, tileSourceRect);
}
} else {
mDT->DrawSurface(source, surfRect, sourceRect);
}
mDT->SetOpaqueRect(oldDT->GetOpaqueRect());
PushClipsToDT(mDT);
mDT->SetTransform(GetDTTransform());
return;
}
DrawTarget* oldDT = mDT;
PushNewDT(content);
if (oldDT != mDT) {
PushClipsToDT(mDT);
}
mDT->SetTransform(GetDTTransform());
CurrentState().mBlendOpacity = aOpacity;
CurrentState().mBlendMask = aMask;
CurrentState().mWasPushedForBlendBack = true;
CurrentState().mBlendMaskTransform = aMaskTransform;
}
void
gfxContext::PopGroupAndBlend()
{
MOZ_ASSERT(CurrentState().mWasPushedForBlendBack);
Float opacity = CurrentState().mBlendOpacity;
RefPtr<SourceSurface> mask = CurrentState().mBlendMask;
Matrix maskTransform = CurrentState().mBlendMaskTransform;
RefPtr<SourceSurface> src = mDT->Snapshot();
Point deviceOffset = CurrentState().deviceOffset;
Restore();
CurrentState().sourceSurfCairo = nullptr;
CurrentState().sourceSurface = src;
CurrentState().sourceSurfaceDeviceOffset = deviceOffset;
CurrentState().pattern = nullptr;
CurrentState().patternTransformChanged = false;
Matrix mat = mTransform;
mat.Invert();
mat.PreTranslate(deviceOffset.x, deviceOffset.y); // device offset translation
CurrentState().surfTransform = mat;
CompositionOp oldOp = GetOp();
SetOp(CompositionOp::OP_OVER);
if (mask) {
if (!maskTransform.HasNonTranslation()) {
Mask(mask, opacity, Point(maskTransform._31, maskTransform._32));
} else {
Mask(mask, opacity, maskTransform);
}
} else {
Paint(opacity);
}
SetOp(oldOp);
}
#ifdef MOZ_DUMP_PAINTING
void
gfxContext::WriteAsPNG(const char* aFile)
{
gfxUtils::WriteAsPNG(mDT, aFile);
}
void
gfxContext::DumpAsDataURI()
{
gfxUtils::DumpAsDataURI(mDT);
}
void
gfxContext::CopyAsDataURI()
{
gfxUtils::CopyAsDataURI(mDT);
}
#endif
void
gfxContext::EnsurePath()
{
if (mPathBuilder) {
mPath = mPathBuilder->Finish();
mPathBuilder = nullptr;
}
if (mPath) {
if (mTransformChanged) {
Matrix mat = mTransform;
mat.Invert();
mat = mPathTransform * mat;
mPathBuilder = mPath->TransformedCopyToBuilder(mat);
mPath = mPathBuilder->Finish();
mPathBuilder = nullptr;
mTransformChanged = false;
}
if (FillRule::FILL_WINDING == mPath->GetFillRule()) {
return;
}
mPathBuilder = mPath->CopyToBuilder();
mPath = mPathBuilder->Finish();
mPathBuilder = nullptr;
return;
}
EnsurePathBuilder();
mPath = mPathBuilder->Finish();
mPathBuilder = nullptr;
}
void
gfxContext::EnsurePathBuilder()
{
if (mPathBuilder && !mTransformChanged) {
return;
}
if (mPath) {
if (!mTransformChanged) {
mPathBuilder = mPath->CopyToBuilder();
mPath = nullptr;
} else {
Matrix invTransform = mTransform;
invTransform.Invert();
Matrix toNewUS = mPathTransform * invTransform;
mPathBuilder = mPath->TransformedCopyToBuilder(toNewUS);
}
return;
}
DebugOnly<PathBuilder*> oldPath = mPathBuilder.get();
if (!mPathBuilder) {
mPathBuilder = mDT->CreatePathBuilder(FillRule::FILL_WINDING);
if (mPathIsRect) {
mPathBuilder->MoveTo(mRect.TopLeft());
mPathBuilder->LineTo(mRect.TopRight());
mPathBuilder->LineTo(mRect.BottomRight());
mPathBuilder->LineTo(mRect.BottomLeft());
mPathBuilder->Close();
}
}
if (mTransformChanged) {
// This could be an else if since this should never happen when
// mPathBuilder is nullptr and mPath is nullptr. But this way we can
// assert if all the state is as expected.
MOZ_ASSERT(oldPath);
MOZ_ASSERT(!mPathIsRect);
Matrix invTransform = mTransform;
invTransform.Invert();
Matrix toNewUS = mPathTransform * invTransform;
RefPtr<Path> path = mPathBuilder->Finish();
mPathBuilder = path->TransformedCopyToBuilder(toNewUS);
}
mPathIsRect = false;
}
void
gfxContext::FillAzure(const Pattern& aPattern, Float aOpacity)
{
AzureState &state = CurrentState();
CompositionOp op = GetOp();
if (mPathIsRect) {
MOZ_ASSERT(!mTransformChanged);
if (op == CompositionOp::OP_SOURCE) {
// Emulate cairo operator source which is bound by mask!
mDT->ClearRect(mRect);
mDT->FillRect(mRect, aPattern, DrawOptions(aOpacity));
} else {
mDT->FillRect(mRect, aPattern, DrawOptions(aOpacity, op, state.aaMode));
}
} else {
EnsurePath();
mDT->Fill(mPath, aPattern, DrawOptions(aOpacity, op, state.aaMode));
}
}
void
gfxContext::PushClipsToDT(DrawTarget *aDT)
{
// Don't need to save the old transform, we'll be setting a new one soon!
// Push all clips from the bottom of the stack to the clip before ours.
for (unsigned int i = 0; i < mStateStack.Length() - 1; i++) {
for (unsigned int c = 0; c < mStateStack[i].pushedClips.Length(); c++) {
aDT->SetTransform(mStateStack[i].pushedClips[c].transform * GetDeviceTransform());
if (mStateStack[i].pushedClips[c].path) {
aDT->PushClip(mStateStack[i].pushedClips[c].path);
} else {
aDT->PushClipRect(mStateStack[i].pushedClips[c].rect);
}
}
}
}
CompositionOp
gfxContext::GetOp()
{
if (CurrentState().op != CompositionOp::OP_SOURCE) {
return CurrentState().op;
}
AzureState &state = CurrentState();
if (state.pattern) {
if (state.pattern->IsOpaque()) {
return CompositionOp::OP_OVER;
} else {
return CompositionOp::OP_SOURCE;
}
} else if (state.sourceSurface) {
if (state.sourceSurface->GetFormat() == SurfaceFormat::B8G8R8X8) {
return CompositionOp::OP_OVER;
} else {
return CompositionOp::OP_SOURCE;
}
} else {
if (state.color.a > 0.999) {
return CompositionOp::OP_OVER;
} else {
return CompositionOp::OP_SOURCE;
}
}
}
/* SVG font code can change the transform after having set the pattern on the
* context. When the pattern is set it is in user space, if the transform is
* changed after doing so the pattern needs to be converted back into userspace.
* We just store the old pattern transform here so that we only do the work
* needed here if the pattern is actually used.
* We need to avoid doing this when this ChangeTransform comes from a restore,
* since the current pattern and the current transform are both part of the
* state we know the new CurrentState()'s values are valid. But if we assume
* a change they might become invalid since patternTransformChanged is part of
* the state and might be false for the restored AzureState.
*/
void
gfxContext::ChangeTransform(const Matrix &aNewMatrix, bool aUpdatePatternTransform)
{
AzureState &state = CurrentState();
if (aUpdatePatternTransform && (state.pattern || state.sourceSurface)
&& !state.patternTransformChanged) {
state.patternTransform = GetDTTransform();
state.patternTransformChanged = true;
}
if (mPathIsRect) {
Matrix invMatrix = aNewMatrix;
invMatrix.Invert();
Matrix toNewUS = mTransform * invMatrix;
if (toNewUS.IsRectilinear()) {
mRect = toNewUS.TransformBounds(mRect);
mRect.NudgeToIntegers();
} else {
mPathBuilder = mDT->CreatePathBuilder(FillRule::FILL_WINDING);
mPathBuilder->MoveTo(toNewUS * mRect.TopLeft());
mPathBuilder->LineTo(toNewUS * mRect.TopRight());
mPathBuilder->LineTo(toNewUS * mRect.BottomRight());
mPathBuilder->LineTo(toNewUS * mRect.BottomLeft());
mPathBuilder->Close();
mPathIsRect = false;
}
// No need to consider the transform changed now!
mTransformChanged = false;
} else if ((mPath || mPathBuilder) && !mTransformChanged) {
mTransformChanged = true;
mPathTransform = mTransform;
}
mTransform = aNewMatrix;
mDT->SetTransform(GetDTTransform());
}
Rect
gfxContext::GetAzureDeviceSpaceClipBounds()
{
Rect rect(CurrentState().deviceOffset.x, CurrentState().deviceOffset.y,
Float(mDT->GetSize().width), Float(mDT->GetSize().height));
for (unsigned int i = 0; i < mStateStack.Length(); i++) {
for (unsigned int c = 0; c < mStateStack[i].pushedClips.Length(); c++) {
AzureState::PushedClip &clip = mStateStack[i].pushedClips[c];
if (clip.path) {
Rect bounds = clip.path->GetBounds(clip.transform);
rect.IntersectRect(rect, bounds);
} else {
rect.IntersectRect(rect, clip.transform.TransformBounds(clip.rect));
}
}
}
return rect;
}
Point
gfxContext::GetDeviceOffset() const
{
return CurrentState().deviceOffset;
}
Matrix
gfxContext::GetDeviceTransform() const
{
return Matrix::Translation(-CurrentState().deviceOffset.x,
-CurrentState().deviceOffset.y);
}
Matrix
gfxContext::GetDTTransform() const
{
Matrix mat = mTransform;
mat._31 -= CurrentState().deviceOffset.x;
mat._32 -= CurrentState().deviceOffset.y;
return mat;
}
void
gfxContext::PushNewDT(gfxContentType content)
{
Rect clipBounds = GetAzureDeviceSpaceClipBounds();
clipBounds.RoundOut();
clipBounds.width = std::max(1.0f, clipBounds.width);
clipBounds.height = std::max(1.0f, clipBounds.height);
SurfaceFormat format = gfxPlatform::GetPlatform()->Optimal2DFormatForContent(content);
RefPtr<DrawTarget> newDT =
mDT->CreateSimilarDrawTarget(IntSize(int32_t(clipBounds.width), int32_t(clipBounds.height)),
format);
if (!newDT) {
NS_WARNING("Failed to create DrawTarget of sufficient size.");
newDT = mDT->CreateSimilarDrawTarget(IntSize(64, 64), format);
if (!newDT) {
if (!gfxPlatform::GetPlatform()->DidRenderingDeviceReset()
#ifdef XP_WIN
&& !(mDT->GetBackendType() == BackendType::DIRECT2D1_1 && !gfxWindowsPlatform::GetPlatform()->GetD3D11ContentDevice())
#endif
) {
// If even this fails.. we're most likely just out of memory!
NS_ABORT_OOM(BytesPerPixel(format) * 64 * 64);
}
newDT = CurrentState().drawTarget;
}
}
Save();
CurrentState().drawTarget = newDT;
CurrentState().deviceOffset = clipBounds.TopLeft();
mDT = newDT;
}
/**
* Work out whether cairo will snap inter-glyph spacing to pixels.
*
* Layout does not align text to pixel boundaries, so, with font drawing
* backends that snap glyph positions to pixels, it is important that
* inter-glyph spacing within words is always an integer number of pixels.
* This ensures that the drawing backend snaps all of the word's glyphs in the
* same direction and so inter-glyph spacing remains the same.
*/
void
gfxContext::GetRoundOffsetsToPixels(bool *aRoundX, bool *aRoundY)
{
*aRoundX = false;
// Could do something fancy here for ScaleFactors of
// AxisAlignedTransforms, but we leave things simple.
// Not much point rounding if a matrix will mess things up anyway.
// Also return false for non-cairo contexts.
if (CurrentMatrix().HasNonTranslation()) {
*aRoundY = false;
return;
}
// All raster backends snap glyphs to pixels vertically.
// Print backends set CAIRO_HINT_METRICS_OFF.
*aRoundY = true;
cairo_t *cr = GetCairo();
cairo_scaled_font_t *scaled_font = cairo_get_scaled_font(cr);
// bug 1198921 - this sometimes fails under Windows for whatver reason
NS_ASSERTION(scaled_font, "null cairo scaled font should never be returned "
"by cairo_get_scaled_font");
if (!scaled_font) {
*aRoundX = true; // default to the same as the fallback path below
return;
}
// Sometimes hint metrics gets set for us, most notably for printing.
cairo_hint_metrics_t hint_metrics =
cairo_scaled_font_get_hint_metrics(scaled_font);
switch (hint_metrics) {
case CAIRO_HINT_METRICS_OFF:
*aRoundY = false;
return;
case CAIRO_HINT_METRICS_DEFAULT:
// Here we mimic what cairo surface/font backends do. Printing
// surfaces have already been handled by hint_metrics. The
// fallback show_glyphs implementation composites pixel-aligned
// glyph surfaces, so we just pick surface/font combinations that
// override this.
switch (cairo_scaled_font_get_type(scaled_font)) {
#if CAIRO_HAS_DWRITE_FONT // dwrite backend is not in std cairo releases yet
case CAIRO_FONT_TYPE_DWRITE:
// show_glyphs is implemented on the font and so is used for
// all surface types; however, it may pixel-snap depending on
// the dwrite rendering mode
if (!cairo_dwrite_scaled_font_get_force_GDI_classic(scaled_font) &&
gfxWindowsPlatform::GetPlatform()->DWriteMeasuringMode() ==
DWRITE_MEASURING_MODE_NATURAL) {
return;
}
MOZ_FALLTHROUGH;
#endif
case CAIRO_FONT_TYPE_QUARTZ:
// Quartz surfaces implement show_glyphs for Quartz fonts
if (cairo_surface_get_type(cairo_get_target(cr)) ==
CAIRO_SURFACE_TYPE_QUARTZ) {
return;
}
break;
default:
break;
}
break;
case CAIRO_HINT_METRICS_ON:
break;
}
*aRoundX = true;
}
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