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gecko/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/. */
#ifdef _MSC_VER
#define _USE_MATH_DEFINES
#endif
#include <math.h>
#include "mozilla/Alignment.h"
#include "cairo.h"
#include "gfxContext.h"
#include "gfxColor.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 CAIRO_HAS_DWRITE_FONT
#include "gfxWindowsPlatform.h"
#endif
using namespace mozilla;
using namespace mozilla::gfx;
UserDataKey gfxContext::sDontUseAsSourceKey;
/* This class lives on the stack and allows gfxContext users to easily, and
* performantly get a gfx::Pattern to use for drawing in their current context.
*/
class PatternFromState
{
public:
explicit PatternFromState(gfxContext *aContext) : mContext(aContext), mPattern(nullptr) {}
~PatternFromState() { if (mPattern) { mPattern->~Pattern(); } }
operator mozilla::gfx::Pattern&()
{
gfxContext::AzureState &state = mContext->CurrentState();
if (state.pattern) {
return *state.pattern->GetPattern(mContext->mDT, state.patternTransformChanged ? &state.patternTransform : nullptr);
} else 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;
} else {
mPattern = new (mColorPattern.addr())
ColorPattern(state.color);
return *mPattern;
}
}
private:
union {
mozilla::AlignedStorage2<mozilla::gfx::ColorPattern> mColorPattern;
mozilla::AlignedStorage2<mozilla::gfx::SurfacePattern> mSurfacePattern;
};
gfxContext *mContext;
Pattern *mPattern;
};
gfxContext::gfxContext(DrawTarget *aTarget, const Point& aDeviceOffset)
: mPathIsRect(false)
, mTransformChanged(false)
, mRefCairo(nullptr)
, mSurface(nullptr)
, mFlags(0)
, 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(Matrix());
}
/* static */ already_AddRefed<gfxContext>
gfxContext::ContextForDrawTarget(DrawTarget* aTarget)
{
Matrix transform = aTarget->GetTransform();
nsRefPtr<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();
}
if (mStateStack[i].clipWasReset) {
break;
}
}
mDT->Flush();
MOZ_COUNT_DTOR(gfxContext);
}
gfxASurface *
gfxContext::OriginalSurface()
{
if (mSurface) {
return mSurface;
}
if (mOriginalDT && mOriginalDT->GetBackendType() == BackendType::CAIRO) {
cairo_surface_t *s =
(cairo_surface_t*)mOriginalDT->GetNativeSurface(NativeSurfaceType::CAIRO_SURFACE);
if (s) {
mSurface = gfxASurface::Wrap(s);
return mSurface;
}
}
return nullptr;
}
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().clipWasReset = false;
CurrentState().pushedClips.Clear();
}
void
gfxContext::Restore()
{
for (unsigned int c = 0; c < CurrentState().pushedClips.Length(); c++) {
mDT->PopClip();
}
if (CurrentState().clipWasReset &&
CurrentState().drawTarget == mStateStack[mStateStack.Length() - 2].drawTarget) {
PushClipsToDT(mDT);
}
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();
}
TemporaryRef<Path> gfxContext::GetPath()
{
EnsurePath();
return mPath;
}
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::Stroke()
{
Stroke(PatternFromState(this));
}
void
gfxContext::Stroke(const Pattern& aPattern)
{
AzureState &state = CurrentState();
if (mPathIsRect) {
MOZ_ASSERT(!mTransformChanged);
mDT->StrokeRect(mRect, aPattern,
state.strokeOptions,
DrawOptions(1.0f, GetOp(), state.aaMode));
} else {
EnsurePath();
mDT->Stroke(mPath, aPattern, state.strokeOptions,
DrawOptions(1.0f, GetOp(), state.aaMode));
}
}
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::FillWithOpacity(gfxFloat aOpacity)
{
FillWithOpacity(PatternFromState(this), aOpacity);
}
void
gfxContext::FillWithOpacity(const Pattern& aPattern, gfxFloat aOpacity)
{
FillAzure(aPattern, Float(aOpacity));
}
void
gfxContext::MoveTo(const gfxPoint& pt)
{
EnsurePathBuilder();
mPathBuilder->MoveTo(ToPoint(pt));
}
void
gfxContext::NewSubPath()
{
// XXX - This has no users, we should kill it, it should be equivelant to a
// MoveTo to the path's current point.
}
void
gfxContext::LineTo(const gfxPoint& pt)
{
EnsurePathBuilder();
mPathBuilder->LineTo(ToPoint(pt));
}
void
gfxContext::CurveTo(const gfxPoint& pt1, const gfxPoint& pt2, const gfxPoint& pt3)
{
EnsurePathBuilder();
mPathBuilder->BezierTo(ToPoint(pt1), ToPoint(pt2), ToPoint(pt3));
}
void
gfxContext::QuadraticCurveTo(const gfxPoint& pt1, const gfxPoint& pt2)
{
EnsurePathBuilder();
mPathBuilder->QuadraticBezierTo(ToPoint(pt1), ToPoint(pt2));
}
void
gfxContext::Arc(const gfxPoint& center, gfxFloat radius,
gfxFloat angle1, gfxFloat angle2)
{
EnsurePathBuilder();
mPathBuilder->Arc(ToPoint(center), Float(radius), Float(angle1), Float(angle2));
}
void
gfxContext::NegativeArc(const gfxPoint& center, gfxFloat radius,
gfxFloat angle1, gfxFloat angle2)
{
EnsurePathBuilder();
mPathBuilder->Arc(ToPoint(center), Float(radius), Float(angle2), Float(angle1));
}
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();
}
void
gfxContext::Ellipse(const gfxPoint& center, const gfxSize& dimensions)
{
gfxSize halfDim = dimensions / 2.0;
gfxRect r(center - gfxPoint(halfDim.width, halfDim.height), dimensions);
gfxCornerSizes c(halfDim, halfDim, halfDim, halfDim);
RoundedRectangle (r, c);
}
void
gfxContext::Polygon(const gfxPoint *points, uint32_t numPoints)
{
if (numPoints == 0) {
return;
}
EnsurePathBuilder();
mPathBuilder->MoveTo(ToPoint(points[0]));
for (uint32_t i = 1; i < numPoints; i++) {
mPathBuilder->LineTo(ToPoint(points[i]));
}
}
void
gfxContext::DrawSurface(gfxASurface *surface, const gfxSize& size)
{
// Lifetime needs to be limited here since we may wrap surface's data.
RefPtr<SourceSurface> surf =
gfxPlatform::GetPlatform()->GetSourceSurfaceForSurface(mDT, surface);
if (!surf) {
return;
}
Rect rect(0, 0, Float(size.width), Float(size.height));
rect.Intersect(Rect(0, 0, Float(surf->GetSize().width), Float(surf->GetSize().height)));
// XXX - Should fix pixel snapping.
mDT->DrawSurface(surf, rect, rect);
}
// 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));
}
gfxSize
gfxContext::DeviceToUser(const gfxSize& size) const
{
Matrix matrix = mTransform;
matrix.Invert();
return ThebesSize(matrix * ToSize(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));
}
gfxSize
gfxContext::UserToDevice(const gfxSize& size) const
{
const Matrix &matrix = mTransform;
gfxSize 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 (GetFlags() & FLAG_DISABLE_SNAPPING)
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 (GetFlags() & FLAG_DISABLE_SNAPPING)
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::PixelSnappedRectangleAndSetPattern(const gfxRect& rect,
gfxPattern *pattern)
{
gfxRect r(rect);
// Bob attempts to pixel-snap the rectangle, and returns true if
// the snapping succeeds. If it does, we need to set up an
// identity matrix, because the rectangle given back is in device
// coordinates.
//
// We then have to call a translate to dr.pos afterwards, to make
// sure the image lines up in the right place with our pixel
// snapped rectangle.
//
// If snapping wasn't successful, we just translate to where the
// pattern would normally start (in app coordinates) and do the
// same thing.
Rectangle(r, true);
SetPattern(pattern);
}
void
gfxContext::SetAntialiasMode(AntialiasMode mode)
{
CurrentState().aaMode = mode;
}
AntialiasMode
gfxContext::CurrentAntialiasMode() const
{
return CurrentState().aaMode;
}
void
gfxContext::SetDash(gfxLineType ltype)
{
static double dash[] = {5.0, 5.0};
static double dot[] = {1.0, 1.0};
switch (ltype) {
case gfxLineDashed:
SetDash(dash, 2, 0.0);
break;
case gfxLineDotted:
SetDash(dot, 2, 0.0);
break;
case gfxLineSolid:
default:
SetDash(nullptr, 0, 0.0);
break;
}
}
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)) {
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::SetOperator(GraphicsOperator op)
{
if (op == OPERATOR_CLEAR) {
CurrentState().opIsClear = true;
return;
}
CurrentState().opIsClear = false;
CurrentState().op = CompositionOpForOp(op);
}
gfxContext::GraphicsOperator
gfxContext::CurrentOperator() const
{
return ThebesOp(CurrentState().op);
}
void
gfxContext::SetLineCap(GraphicsLineCap cap)
{
CurrentState().strokeOptions.mLineCap = ToCapStyle(cap);
}
gfxContext::GraphicsLineCap
gfxContext::CurrentLineCap() const
{
return ThebesLineCap(CurrentState().strokeOptions.mLineCap);
}
void
gfxContext::SetLineJoin(GraphicsLineJoin join)
{
CurrentState().strokeOptions.mLineJoin = ToJoinStyle(join);
}
gfxContext::GraphicsLineJoin
gfxContext::CurrentLineJoin() const
{
return ThebesLineJoin(CurrentState().strokeOptions.mLineJoin);
}
void
gfxContext::SetMiterLimit(gfxFloat limit)
{
CurrentState().strokeOptions.mMiterLimit = Float(limit);
}
gfxFloat
gfxContext::CurrentMiterLimit() const
{
return CurrentState().strokeOptions.mMiterLimit;
}
void
gfxContext::SetFillRule(FillRule rule)
{
CurrentState().fillRule = rule;
}
FillRule
gfxContext::CurrentFillRule() const
{
return CurrentState().fillRule;
}
// clipping
void
gfxContext::Clip(const gfxRect& rect)
{
AzureState::PushedClip clip = { nullptr, ToRect(rect), mTransform };
CurrentState().pushedClips.AppendElement(clip);
mDT->PushClipRect(ToRect(rect));
NewPath();
}
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::ResetClip()
{
for (int i = mStateStack.Length() - 1; i >= 0; i--) {
for (unsigned int c = 0; c < mStateStack[i].pushedClips.Length(); c++) {
mDT->PopClip();
}
if (mStateStack[i].clipWasReset) {
break;
}
}
CurrentState().pushedClips.Clear();
CurrentState().clipWasReset = true;
}
void
gfxContext::UpdateSurfaceClip()
{
}
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::ClipContainsRect(const gfxRect& aRect)
{
unsigned int lastReset = 0;
for (int i = mStateStack.Length() - 2; i > 0; i--) {
if (mStateStack[i].clipWasReset) {
lastReset = i;
break;
}
}
// 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 = lastReset; 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 gfxRGBA& c)
{
CurrentState().pattern = nullptr;
CurrentState().sourceSurfCairo = nullptr;
CurrentState().sourceSurface = nullptr;
if (gfxPlatform::GetCMSMode() == eCMSMode_All) {
gfxRGBA cms;
qcms_transform *transform = gfxPlatform::GetCMSRGBTransform();
if (transform)
gfxPlatform::TransformPixel(c, cms, transform);
// Use the original alpha to avoid unnecessary float->byte->float
// conversion errors
CurrentState().color = ToColor(cms);
}
else
CurrentState().color = ToColor(c);
}
void
gfxContext::SetDeviceColor(const gfxRGBA& c)
{
CurrentState().pattern = nullptr;
CurrentState().sourceSurfCairo = nullptr;
CurrentState().sourceSurface = nullptr;
CurrentState().color = ToColor(c);
}
bool
gfxContext::GetDeviceColor(gfxRGBA& c)
{
if (CurrentState().sourceSurface) {
return false;
}
if (CurrentState().pattern) {
gfxRGBA color;
return CurrentState().pattern->GetSolidColor(c);
}
c = ThebesRGBA(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()
{
nsRefPtr<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(ThebesRGBA(state.color));
}
return pat.forget();
}
// masking
void
gfxContext::Mask(SourceSurface* aSurface, const Matrix& aTransform)
{
Matrix old = mTransform;
Matrix mat = aTransform * mTransform;
ChangeTransform(mat);
mDT->MaskSurface(PatternFromState(this), aSurface, Point(),
DrawOptions(1.0f, 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, Point(offset.x - pt.x, offset.y - pt.y));
}
void
gfxContext::Mask(SourceSurface *surface, const Point& offset)
{
// We clip here to bind to the mask surface bounds, see above.
mDT->MaskSurface(PatternFromState(this),
surface,
offset,
DrawOptions(1.0f, 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 && !state.opIsClear)
{
// 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())));
if (state.opIsClear) {
mDT->ClearRect(paintRect);
} else {
mDT->FillRect(paintRect, PatternFromState(this),
DrawOptions(Float(alpha), GetOp()));
}
}
// groups
void
gfxContext::PushGroup(gfxContentType content)
{
DrawTarget* oldDT = mDT;
PushNewDT(content);
if (oldDT != mDT) {
PushClipsToDT(mDT);
}
mDT->SetTransform(GetDTTransform());
}
static gfxRect
GetRoundOutDeviceClipExtents(gfxContext* aCtx)
{
gfxContextMatrixAutoSaveRestore save(aCtx);
aCtx->SetMatrix(gfxMatrix());
gfxRect r = aCtx->GetClipExtents();
r.RoundOut();
return r;
}
void
gfxContext::PushGroupAndCopyBackground(gfxContentType content)
{
IntRect clipExtents;
if (mDT->GetFormat() != SurfaceFormat::B8G8R8X8) {
gfxRect clipRect = GetRoundOutDeviceClipExtents(this);
clipExtents = IntRect(clipRect.x, clipRect.y, clipRect.width, clipRect.height);
}
if ((mDT->GetFormat() == SurfaceFormat::B8G8R8X8 ||
mDT->GetOpaqueRect().Contains(clipExtents)) &&
!mDT->GetUserData(&sDontUseAsSourceKey)) {
DrawTarget *oldDT = mDT;
RefPtr<SourceSurface> source = mDT->Snapshot();
Point oldDeviceOffset = CurrentState().deviceOffset;
PushNewDT(gfxContentType::COLOR);
if (oldDT == mDT) {
// Creating new DT failed.
return;
}
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;
}
PushGroup(content);
}
already_AddRefed<gfxPattern>
gfxContext::PopGroup()
{
RefPtr<SourceSurface> src = mDT->Snapshot();
Point deviceOffset = CurrentState().deviceOffset;
Restore();
Matrix mat = mTransform;
mat.Invert();
mat.PreTranslate(deviceOffset.x, deviceOffset.y); // device offset translation
nsRefPtr<gfxPattern> pat = new gfxPattern(src, mat);
return pat.forget();
}
TemporaryRef<SourceSurface>
gfxContext::PopGroupToSurface(Matrix* aTransform)
{
RefPtr<SourceSurface> src = mDT->Snapshot();
Point deviceOffset = CurrentState().deviceOffset;
Restore();
Matrix mat = mTransform;
mat.Invert();
Matrix deviceOffsetTranslation;
deviceOffsetTranslation.PreTranslate(deviceOffset.x, deviceOffset.y);
*aTransform = deviceOffsetTranslation * mat;
return src;
}
void
gfxContext::PopGroupToSource()
{
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;
}
bool
gfxContext::PointInFill(const gfxPoint& pt)
{
EnsurePath();
return mPath->ContainsPoint(ToPoint(pt), Matrix());
}
bool
gfxContext::PointInStroke(const gfxPoint& pt)
{
EnsurePath();
return mPath->StrokeContainsPoint(CurrentState().strokeOptions,
ToPoint(pt),
Matrix());
}
gfxRect
gfxContext::GetUserPathExtent()
{
if (mPathIsRect) {
return ThebesRect(mTransform.TransformBounds(mRect));
}
EnsurePath();
return ThebesRect(mPath->GetBounds());
}
gfxRect
gfxContext::GetUserFillExtent()
{
if (mPathIsRect) {
return ThebesRect(mTransform.TransformBounds(mRect));
}
EnsurePath();
return ThebesRect(mPath->GetBounds());
}
gfxRect
gfxContext::GetUserStrokeExtent()
{
if (mPathIsRect) {
Rect rect = mRect;
rect.Inflate(CurrentState().strokeOptions.mLineWidth / 2);
return ThebesRect(mTransform.TransformBounds(rect));
}
EnsurePath();
return ThebesRect(mPath->GetStrokedBounds(CurrentState().strokeOptions, mTransform));
}
bool
gfxContext::HasError()
{
// As far as this is concerned, an Azure context is never in error.
return false;
}
void
gfxContext::RoundedRectangle(const gfxRect& rect,
const gfxCornerSizes& corners,
bool draw_clockwise)
{
//
// For CW drawing, this looks like:
//
// ...******0** 1 C
// ****
// *** 2
// **
// *
// *
// 3
// *
// *
//
// Where 0, 1, 2, 3 are the control points of the Bezier curve for
// the corner, and C is the actual corner point.
//
// At the start of the loop, the current point is assumed to be
// the point adjacent to the top left corner on the top
// horizontal. Note that corner indices start at the top left and
// continue clockwise, whereas in our loop i = 0 refers to the top
// right corner.
//
// When going CCW, the control points are swapped, and the first
// corner that's drawn is the top left (along with the top segment).
//
// There is considerable latitude in how one chooses the four
// control points for a Bezier curve approximation to an ellipse.
// For the overall path to be continuous and show no corner at the
// endpoints of the arc, points 0 and 3 must be at the ends of the
// straight segments of the rectangle; points 0, 1, and C must be
// collinear; and points 3, 2, and C must also be collinear. This
// leaves only two free parameters: the ratio of the line segments
// 01 and 0C, and the ratio of the line segments 32 and 3C. See
// the following papers for extensive discussion of how to choose
// these ratios:
//
// Dokken, Tor, et al. "Good approximation of circles by
// curvature-continuous Bezier curves." Computer-Aided
// Geometric Design 7(1990) 33--41.
// Goldapp, Michael. "Approximation of circular arcs by cubic
// polynomials." Computer-Aided Geometric Design 8(1991) 227--238.
// Maisonobe, Luc. "Drawing an elliptical arc using polylines,
// quadratic, or cubic Bezier curves."
// http://www.spaceroots.org/documents/ellipse/elliptical-arc.pdf
//
// We follow the approach in section 2 of Goldapp (least-error,
// Hermite-type approximation) and make both ratios equal to
//
// 2 2 + n - sqrt(2n + 28)
// alpha = - * ---------------------
// 3 n - 4
//
// where n = 3( cbrt(sqrt(2)+1) - cbrt(sqrt(2)-1) ).
//
// This is the result of Goldapp's equation (10b) when the angle
// swept out by the arc is pi/2, and the parameter "a-bar" is the
// expression given immediately below equation (21).
//
// Using this value, the maximum radial error for a circle, as a
// fraction of the radius, is on the order of 0.2 x 10^-3.
// Neither Dokken nor Goldapp discusses error for a general
// ellipse; Maisonobe does, but his choice of control points
// follows different constraints, and Goldapp's expression for
// 'alpha' gives much smaller radial error, even for very flat
// ellipses, than Maisonobe's equivalent.
//
// For the various corners and for each axis, the sign of this
// constant changes, or it might be 0 -- it's multiplied by the
// appropriate multiplier from the list before using.
EnsurePathBuilder();
Size radii[] = { ToSize(corners[NS_CORNER_TOP_LEFT]),
ToSize(corners[NS_CORNER_TOP_RIGHT]),
ToSize(corners[NS_CORNER_BOTTOM_RIGHT]),
ToSize(corners[NS_CORNER_BOTTOM_LEFT]) };
AppendRoundedRectToPath(mPathBuilder, ToRect(rect), radii, draw_clockwise);
}
#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, CurrentState().fillRule);
mPath = mPathBuilder->Finish();
mPathBuilder = nullptr;
mTransformChanged = false;
}
if (CurrentState().fillRule == mPath->GetFillRule()) {
return;
}
mPathBuilder = mPath->CopyToBuilder(CurrentState().fillRule);
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(CurrentState().fillRule);
mPath = nullptr;
} else {
Matrix invTransform = mTransform;
invTransform.Invert();
Matrix toNewUS = mPathTransform * invTransform;
mPathBuilder = mPath->TransformedCopyToBuilder(toNewUS, CurrentState().fillRule);
}
return;
}
DebugOnly<PathBuilder*> oldPath = mPathBuilder.get();
if (!mPathBuilder) {
mPathBuilder = mDT->CreatePathBuilder(CurrentState().fillRule);
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, CurrentState().fillRule);
}
mPathIsRect = false;
}
void
gfxContext::FillAzure(const Pattern& aPattern, Float aOpacity)
{
AzureState &state = CurrentState();
CompositionOp op = GetOp();
if (mPathIsRect) {
MOZ_ASSERT(!mTransformChanged);
if (state.opIsClear) {
mDT->ClearRect(mRect);
} else 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();
NS_ASSERTION(!state.opIsClear, "We shouldn't be clearing complex paths!");
mDT->Fill(mPath, aPattern, DrawOptions(aOpacity, op, state.aaMode));
}
}
void
gfxContext::PushClipsToDT(DrawTarget *aDT)
{
// Tricky, we have to restore all clips -since the last time- the clip
// was reset. If we didn't reset the clip, just popping the clips we
// added was fine.
unsigned int lastReset = 0;
for (int i = mStateStack.Length() - 2; i > 0; i--) {
if (mStateStack[i].clipWasReset) {
lastReset = i;
break;
}
}
// Don't need to save the old transform, we'll be setting a new one soon!
// Push all clips from the last state on the stack where the clip was
// reset to the clip before ours.
for (unsigned int i = lastReset; 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(CurrentState().fillRule);
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()
{
unsigned int lastReset = 0;
for (int i = mStateStack.Length() - 1; i > 0; i--) {
if (mStateStack[i].clipWasReset) {
lastReset = i;
break;
}
}
Rect rect(CurrentState().deviceOffset.x, CurrentState().deviceOffset.y,
Float(mDT->GetSize().width), Float(mDT->GetSize().height));
for (unsigned int i = lastReset; 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()) {
// 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);
// Sometimes hint metrics gets set for us, most notably for printing.
cairo_font_options_t *font_options = cairo_font_options_create();
cairo_scaled_font_get_font_options(scaled_font, font_options);
cairo_hint_metrics_t hint_metrics =
cairo_font_options_get_hint_metrics(font_options);
cairo_font_options_destroy(font_options);
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;
}
#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;
}
default:
break;
}
// fall through:
case CAIRO_HINT_METRICS_ON:
break;
}
*aRoundX = true;
return;
}
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