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DrawTargetCairo.cpp
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "DrawTargetCairo.h"
#include "SourceSurfaceCairo.h"
#include "PathCairo.h"
#include "HelpersCairo.h"
#include "BorrowedContext.h"
#include "FilterNodeSoftware.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/Vector.h"
#include "mozilla/StaticPrefs_gfx.h"
#include "mozilla/StaticPrefs_print.h"
#include "nsPrintfCString.h"
#include "cairo.h"
#include "cairo-tee.h"
#include <string.h>
#include "Blur.h"
#include "Logging.h"
#include "Tools.h"
#ifdef CAIRO_HAS_QUARTZ_SURFACE
# include "cairo-quartz.h"
# ifdef MOZ_WIDGET_COCOA
# include <ApplicationServices/ApplicationServices.h>
# endif
#endif
#ifdef CAIRO_HAS_XLIB_SURFACE
# include "cairo-xlib.h"
#endif
#ifdef CAIRO_HAS_WIN32_SURFACE
# include "cairo-win32.h"
#endif
#define PIXMAN_DONT_DEFINE_STDINT
#include "pixman.h"
#include <algorithm>
// 2^23
#define CAIRO_COORD_MAX (Float(0x7fffff))
namespace mozilla {
namespace gfx {
cairo_surface_t* DrawTargetCairo::mDummySurface;
namespace {
// An RAII class to prepare to draw a context and optional path. Saves and
// restores the context on construction/destruction.
class AutoPrepareForDrawing {
public:
AutoPrepareForDrawing(DrawTargetCairo* dt, cairo_t* ctx) : mCtx(ctx) {
dt->PrepareForDrawing(ctx);
cairo_save(mCtx);
MOZ_ASSERT(cairo_status(mCtx) ||
dt->GetTransform().FuzzyEquals(GetTransform()));
}
AutoPrepareForDrawing(DrawTargetCairo* dt, cairo_t* ctx, const Path* path)
: mCtx(ctx) {
dt->PrepareForDrawing(ctx, path);
cairo_save(mCtx);
MOZ_ASSERT(cairo_status(mCtx) ||
dt->GetTransform().FuzzyEquals(GetTransform()));
}
~AutoPrepareForDrawing() {
cairo_restore(mCtx);
cairo_status_t status = cairo_status(mCtx);
if (status) {
gfxWarning() << "DrawTargetCairo context in error state: "
<< cairo_status_to_string(status) << "(" << status << ")";
}
}
private:
#ifdef DEBUG
Matrix GetTransform() {
cairo_matrix_t mat;
cairo_get_matrix(mCtx, &mat);
return Matrix(mat.xx, mat.yx, mat.xy, mat.yy, mat.x0, mat.y0);
}
#endif
cairo_t* mCtx;
};
/* Clamp r to (0,0) (2^23,2^23)
* these are to be device coordinates.
*
* Returns false if the rectangle is completely out of bounds,
* true otherwise.
*
* This function assumes that it will be called with a rectangle being
* drawn into a surface with an identity transformation matrix; that
* is, anything above or to the left of (0,0) will be offscreen.
*
* First it checks if the rectangle is entirely beyond
* CAIRO_COORD_MAX; if so, it can't ever appear on the screen --
* false is returned.
*
* Then it shifts any rectangles with x/y < 0 so that x and y are = 0,
* and adjusts the width and height appropriately. For example, a
* rectangle from (0,-5) with dimensions (5,10) will become a
* rectangle from (0,0) with dimensions (5,5).
*
* If after negative x/y adjustment to 0, either the width or height
* is negative, then the rectangle is completely offscreen, and
* nothing is drawn -- false is returned.
*
* Finally, if x+width or y+height are greater than CAIRO_COORD_MAX,
* the width and height are clamped such x+width or y+height are equal
* to CAIRO_COORD_MAX, and true is returned.
*/
static bool ConditionRect(Rect& r) {
// if either x or y is way out of bounds;
// note that we don't handle negative w/h here
if (r.X() > CAIRO_COORD_MAX || r.Y() > CAIRO_COORD_MAX) return false;
if (r.X() < 0.f) {
r.SetWidth(r.XMost());
if (r.Width() < 0.f) return false;
r.MoveToX(0.f);
}
if (r.XMost() > CAIRO_COORD_MAX) {
r.SetRightEdge(CAIRO_COORD_MAX);
}
if (r.Y() < 0.f) {
r.SetHeight(r.YMost());
if (r.Height() < 0.f) return false;
r.MoveToY(0.f);
}
if (r.YMost() > CAIRO_COORD_MAX) {
r.SetBottomEdge(CAIRO_COORD_MAX);
}
return true;
}
} // end anonymous namespace
static bool SupportsSelfCopy(cairo_surface_t* surface) {
switch (cairo_surface_get_type(surface)) {
#ifdef CAIRO_HAS_QUARTZ_SURFACE
case CAIRO_SURFACE_TYPE_QUARTZ:
return true;
#endif
#ifdef CAIRO_HAS_WIN32_SURFACE
case CAIRO_SURFACE_TYPE_WIN32:
case CAIRO_SURFACE_TYPE_WIN32_PRINTING:
return true;
#endif
default:
return false;
}
}
static bool PatternIsCompatible(const Pattern& aPattern) {
switch (aPattern.GetType()) {
case PatternType::LINEAR_GRADIENT: {
const LinearGradientPattern& pattern =
static_cast<const LinearGradientPattern&>(aPattern);
return pattern.mStops->GetBackendType() == BackendType::CAIRO;
}
case PatternType::RADIAL_GRADIENT: {
const RadialGradientPattern& pattern =
static_cast<const RadialGradientPattern&>(aPattern);
return pattern.mStops->GetBackendType() == BackendType::CAIRO;
}
case PatternType::CONIC_GRADIENT: {
const ConicGradientPattern& pattern =
static_cast<const ConicGradientPattern&>(aPattern);
return pattern.mStops->GetBackendType() == BackendType::CAIRO;
}
default:
return true;
}
}
static cairo_user_data_key_t surfaceDataKey;
static void ReleaseData(void* aData) {
DataSourceSurface* data = static_cast<DataSourceSurface*>(aData);
data->Unmap();
data->Release();
}
static cairo_surface_t* CopyToImageSurface(unsigned char* aData,
const IntRect& aRect,
int32_t aStride,
SurfaceFormat aFormat) {
MOZ_ASSERT(aData);
auto aRectWidth = aRect.Width();
auto aRectHeight = aRect.Height();
cairo_surface_t* surf = cairo_image_surface_create(
GfxFormatToCairoFormat(aFormat), aRectWidth, aRectHeight);
// In certain scenarios, requesting larger than 8k image fails. Bug 803568
// covers the details of how to run into it, but the full detailed
// investigation hasn't been done to determine the underlying cause. We
// will just handle the failure to allocate the surface to avoid a crash.
if (cairo_surface_status(surf)) {
gfxWarning() << "Invalid surface DTC " << cairo_surface_status(surf);
return nullptr;
}
unsigned char* surfData = cairo_image_surface_get_data(surf);
int surfStride = cairo_image_surface_get_stride(surf);
int32_t pixelWidth = BytesPerPixel(aFormat);
unsigned char* source = aData + aRect.Y() * aStride + aRect.X() * pixelWidth;
MOZ_ASSERT(aStride >= aRectWidth * pixelWidth);
for (int32_t y = 0; y < aRectHeight; ++y) {
memcpy(surfData + y * surfStride, source + y * aStride,
aRectWidth * pixelWidth);
}
cairo_surface_mark_dirty(surf);
return surf;
}
/**
* If aSurface can be represented as a surface of type
* CAIRO_SURFACE_TYPE_IMAGE then returns that surface. Does
* not add a reference.
*/
static cairo_surface_t* GetAsImageSurface(cairo_surface_t* aSurface) {
if (cairo_surface_get_type(aSurface) == CAIRO_SURFACE_TYPE_IMAGE) {
return aSurface;
#ifdef CAIRO_HAS_WIN32_SURFACE
} else if (cairo_surface_get_type(aSurface) == CAIRO_SURFACE_TYPE_WIN32) {
return cairo_win32_surface_get_image(aSurface);
#endif
}
return nullptr;
}
static cairo_surface_t* CreateSubImageForData(unsigned char* aData,
const IntRect& aRect, int aStride,
SurfaceFormat aFormat) {
if (!aData) {
gfxWarning() << "DrawTargetCairo.CreateSubImageForData null aData";
return nullptr;
}
unsigned char* data =
aData + aRect.Y() * aStride + aRect.X() * BytesPerPixel(aFormat);
cairo_surface_t* image = cairo_image_surface_create_for_data(
data, GfxFormatToCairoFormat(aFormat), aRect.Width(), aRect.Height(),
aStride);
// Set the subimage's device offset so that in remains in the same place
// relative to the parent
cairo_surface_set_device_offset(image, -aRect.X(), -aRect.Y());
return image;
}
/**
* Returns a referenced cairo_surface_t representing the
* sub-image specified by aSubImage.
*/
static cairo_surface_t* ExtractSubImage(cairo_surface_t* aSurface,
const IntRect& aSubImage,
SurfaceFormat aFormat) {
// No need to worry about retaining a reference to the original
// surface since the only caller of this function guarantees
// that aSurface will stay alive as long as the result
cairo_surface_t* image = GetAsImageSurface(aSurface);
if (image) {
image =
CreateSubImageForData(cairo_image_surface_get_data(image), aSubImage,
cairo_image_surface_get_stride(image), aFormat);
return image;
}
cairo_surface_t* similar = cairo_surface_create_similar(
aSurface, cairo_surface_get_content(aSurface), aSubImage.Width(),
aSubImage.Height());
cairo_t* ctx = cairo_create(similar);
cairo_set_operator(ctx, CAIRO_OPERATOR_SOURCE);
cairo_set_source_surface(ctx, aSurface, -aSubImage.X(), -aSubImage.Y());
cairo_paint(ctx);
cairo_destroy(ctx);
cairo_surface_set_device_offset(similar, -aSubImage.X(), -aSubImage.Y());
return similar;
}
/**
* Returns cairo surface for the given SourceSurface.
* If possible, it will use the cairo_surface associated with aSurface,
* otherwise, it will create a new cairo_surface.
* In either case, the caller must call cairo_surface_destroy on the
* result when it is done with it.
*/
static cairo_surface_t* GetCairoSurfaceForSourceSurface(
SourceSurface* aSurface, bool aExistingOnly = false,
const IntRect& aSubImage = IntRect()) {
if (!aSurface) {
return nullptr;
}
IntRect subimage = IntRect(IntPoint(), aSurface->GetSize());
if (!aSubImage.IsEmpty()) {
MOZ_ASSERT(!aExistingOnly);
MOZ_ASSERT(subimage.Contains(aSubImage));
subimage = aSubImage;
}
if (aSurface->GetType() == SurfaceType::CAIRO) {
cairo_surface_t* surf =
static_cast<SourceSurfaceCairo*>(aSurface)->GetSurface();
if (aSubImage.IsEmpty()) {
cairo_surface_reference(surf);
} else {
surf = ExtractSubImage(surf, subimage, aSurface->GetFormat());
}
return surf;
}
if (aSurface->GetType() == SurfaceType::CAIRO_IMAGE) {
cairo_surface_t* surf =
static_cast<const DataSourceSurfaceCairo*>(aSurface)->GetSurface();
if (aSubImage.IsEmpty()) {
cairo_surface_reference(surf);
} else {
surf = ExtractSubImage(surf, subimage, aSurface->GetFormat());
}
return surf;
}
if (aExistingOnly) {
return nullptr;
}
RefPtr<DataSourceSurface> data = aSurface->GetDataSurface();
if (!data) {
return nullptr;
}
DataSourceSurface::MappedSurface map;
if (!data->Map(DataSourceSurface::READ, &map)) {
return nullptr;
}
cairo_surface_t* surf = CreateSubImageForData(map.mData, subimage,
map.mStride, data->GetFormat());
// In certain scenarios, requesting larger than 8k image fails. Bug 803568
// covers the details of how to run into it, but the full detailed
// investigation hasn't been done to determine the underlying cause. We
// will just handle the failure to allocate the surface to avoid a crash.
if (!surf || cairo_surface_status(surf)) {
if (surf && (cairo_surface_status(surf) == CAIRO_STATUS_INVALID_STRIDE)) {
// If we failed because of an invalid stride then copy into
// a new surface with a stride that cairo chooses. No need to
// set user data since we're not dependent on the original
// data.
cairo_surface_t* result = CopyToImageSurface(
map.mData, subimage, map.mStride, data->GetFormat());
data->Unmap();
return result;
}
data->Unmap();
return nullptr;
}
cairo_surface_set_user_data(surf, &surfaceDataKey, data.forget().take(),
ReleaseData);
return surf;
}
// An RAII class to temporarily clear any device offset set
// on a surface. Note that this does not take a reference to the
// surface.
class AutoClearDeviceOffset final {
public:
explicit AutoClearDeviceOffset(SourceSurface* aSurface)
: mSurface(nullptr), mX(0), mY(0) {
Init(aSurface);
}
explicit AutoClearDeviceOffset(const Pattern& aPattern)
: mSurface(nullptr), mX(0.0), mY(0.0) {
if (aPattern.GetType() == PatternType::SURFACE) {
const SurfacePattern& pattern =
static_cast<const SurfacePattern&>(aPattern);
Init(pattern.mSurface);
}
}
~AutoClearDeviceOffset() {
if (mSurface) {
cairo_surface_set_device_offset(mSurface, mX, mY);
}
}
private:
void Init(SourceSurface* aSurface) {
cairo_surface_t* surface = GetCairoSurfaceForSourceSurface(aSurface, true);
if (surface) {
Init(surface);
cairo_surface_destroy(surface);
}
}
void Init(cairo_surface_t* aSurface) {
mSurface = aSurface;
cairo_surface_get_device_offset(mSurface, &mX, &mY);
cairo_surface_set_device_offset(mSurface, 0, 0);
}
cairo_surface_t* mSurface;
double mX;
double mY;
};
static inline void CairoPatternAddGradientStop(cairo_pattern_t* aPattern,
const GradientStop& aStop,
Float aNudge = 0) {
cairo_pattern_add_color_stop_rgba(aPattern, aStop.offset + aNudge,
aStop.color.r, aStop.color.g, aStop.color.b,
aStop.color.a);
}
// Never returns nullptr. As such, you must always pass in Cairo-compatible
// patterns, most notably gradients with a GradientStopCairo.
// The pattern returned must have cairo_pattern_destroy() called on it by the
// caller.
// As the cairo_pattern_t returned may depend on the Pattern passed in, the
// lifetime of the cairo_pattern_t returned must not exceed the lifetime of the
// Pattern passed in.
static cairo_pattern_t* GfxPatternToCairoPattern(const Pattern& aPattern,
Float aAlpha,
const Matrix& aTransform) {
cairo_pattern_t* pat;
const Matrix* matrix = nullptr;
switch (aPattern.GetType()) {
case PatternType::COLOR: {
DeviceColor color = static_cast<const ColorPattern&>(aPattern).mColor;
pat = cairo_pattern_create_rgba(color.r, color.g, color.b,
color.a * aAlpha);
break;
}
case PatternType::SURFACE: {
const SurfacePattern& pattern =
static_cast<const SurfacePattern&>(aPattern);
cairo_surface_t* surf = GetCairoSurfaceForSourceSurface(
pattern.mSurface, false, pattern.mSamplingRect);
if (!surf) return nullptr;
pat = cairo_pattern_create_for_surface(surf);
matrix = &pattern.mMatrix;
cairo_pattern_set_filter(
pat, GfxSamplingFilterToCairoFilter(pattern.mSamplingFilter));
cairo_pattern_set_extend(pat,
GfxExtendToCairoExtend(pattern.mExtendMode));
cairo_surface_destroy(surf);
break;
}
case PatternType::LINEAR_GRADIENT: {
const LinearGradientPattern& pattern =
static_cast<const LinearGradientPattern&>(aPattern);
pat = cairo_pattern_create_linear(pattern.mBegin.x, pattern.mBegin.y,
pattern.mEnd.x, pattern.mEnd.y);
MOZ_ASSERT(pattern.mStops->GetBackendType() == BackendType::CAIRO);
GradientStopsCairo* cairoStops =
static_cast<GradientStopsCairo*>(pattern.mStops.get());
cairo_pattern_set_extend(
pat, GfxExtendToCairoExtend(cairoStops->GetExtendMode()));
matrix = &pattern.mMatrix;
const std::vector<GradientStop>& stops = cairoStops->GetStops();
for (size_t i = 0; i < stops.size(); ++i) {
CairoPatternAddGradientStop(pat, stops[i]);
}
break;
}
case PatternType::RADIAL_GRADIENT: {
const RadialGradientPattern& pattern =
static_cast<const RadialGradientPattern&>(aPattern);
pat = cairo_pattern_create_radial(pattern.mCenter1.x, pattern.mCenter1.y,
pattern.mRadius1, pattern.mCenter2.x,
pattern.mCenter2.y, pattern.mRadius2);
MOZ_ASSERT(pattern.mStops->GetBackendType() == BackendType::CAIRO);
GradientStopsCairo* cairoStops =
static_cast<GradientStopsCairo*>(pattern.mStops.get());
cairo_pattern_set_extend(
pat, GfxExtendToCairoExtend(cairoStops->GetExtendMode()));
matrix = &pattern.mMatrix;
const std::vector<GradientStop>& stops = cairoStops->GetStops();
for (size_t i = 0; i < stops.size(); ++i) {
CairoPatternAddGradientStop(pat, stops[i]);
}
break;
}
case PatternType::CONIC_GRADIENT: {
// XXX(ntim): Bug 1617039 - Implement conic-gradient for Cairo
pat = cairo_pattern_create_rgba(0.0, 0.0, 0.0, 0.0);
break;
}
default: {
// We should support all pattern types!
MOZ_ASSERT(false);
}
}
// The pattern matrix is a matrix that transforms the pattern into user
// space. Cairo takes a matrix that converts from user space to pattern
// space. Cairo therefore needs the inverse.
if (matrix) {
cairo_matrix_t mat;
GfxMatrixToCairoMatrix(*matrix, mat);
cairo_matrix_invert(&mat);
cairo_pattern_set_matrix(pat, &mat);
}
return pat;
}
static bool NeedIntermediateSurface(const Pattern& aPattern,
const DrawOptions& aOptions) {
// We pre-multiply colours' alpha by the global alpha, so we don't need to
// use an intermediate surface for them.
if (aPattern.GetType() == PatternType::COLOR) return false;
if (aOptions.mAlpha == 1.0) return false;
return true;
}
DrawTargetCairo::DrawTargetCairo()
: mContext(nullptr),
mSurface(nullptr),
mTransformSingular(false),
mLockedBits(nullptr),
mFontOptions(nullptr) {}
DrawTargetCairo::~DrawTargetCairo() {
cairo_destroy(mContext);
if (mSurface) {
cairo_surface_destroy(mSurface);
mSurface = nullptr;
}
if (mFontOptions) {
cairo_font_options_destroy(mFontOptions);
mFontOptions = nullptr;
}
MOZ_ASSERT(!mLockedBits);
}
bool DrawTargetCairo::IsValid() const {
return mSurface && !cairo_surface_status(mSurface) && mContext &&
!cairo_surface_status(cairo_get_group_target(mContext));
}
DrawTargetType DrawTargetCairo::GetType() const {
if (mContext) {
cairo_surface_type_t type = cairo_surface_get_type(mSurface);
if (type == CAIRO_SURFACE_TYPE_TEE) {
type = cairo_surface_get_type(cairo_tee_surface_index(mSurface, 0));
MOZ_ASSERT(type != CAIRO_SURFACE_TYPE_TEE, "C'mon!");
MOZ_ASSERT(
type == cairo_surface_get_type(cairo_tee_surface_index(mSurface, 1)),
"What should we do here?");
}
switch (type) {
case CAIRO_SURFACE_TYPE_PDF:
case CAIRO_SURFACE_TYPE_PS:
case CAIRO_SURFACE_TYPE_SVG:
case CAIRO_SURFACE_TYPE_WIN32_PRINTING:
case CAIRO_SURFACE_TYPE_XML:
return DrawTargetType::VECTOR;
case CAIRO_SURFACE_TYPE_VG:
case CAIRO_SURFACE_TYPE_GL:
case CAIRO_SURFACE_TYPE_GLITZ:
case CAIRO_SURFACE_TYPE_QUARTZ:
case CAIRO_SURFACE_TYPE_DIRECTFB:
return DrawTargetType::HARDWARE_RASTER;
case CAIRO_SURFACE_TYPE_SKIA:
case CAIRO_SURFACE_TYPE_QT:
MOZ_FALLTHROUGH_ASSERT(
"Can't determine actual DrawTargetType for DrawTargetCairo - "
"assuming SOFTWARE_RASTER");
case CAIRO_SURFACE_TYPE_IMAGE:
case CAIRO_SURFACE_TYPE_XLIB:
case CAIRO_SURFACE_TYPE_XCB:
case CAIRO_SURFACE_TYPE_WIN32:
case CAIRO_SURFACE_TYPE_BEOS:
case CAIRO_SURFACE_TYPE_OS2:
case CAIRO_SURFACE_TYPE_QUARTZ_IMAGE:
case CAIRO_SURFACE_TYPE_SCRIPT:
case CAIRO_SURFACE_TYPE_RECORDING:
case CAIRO_SURFACE_TYPE_DRM:
case CAIRO_SURFACE_TYPE_SUBSURFACE:
case CAIRO_SURFACE_TYPE_TEE: // included to silence warning about
// unhandled enum value
return DrawTargetType::SOFTWARE_RASTER;
default:
MOZ_CRASH("GFX: Unsupported cairo surface type");
}
}
MOZ_ASSERT(false, "Could not determine DrawTargetType for DrawTargetCairo");
return DrawTargetType::SOFTWARE_RASTER;
}
IntSize DrawTargetCairo::GetSize() const { return mSize; }
SurfaceFormat GfxFormatForCairoSurface(cairo_surface_t* surface) {
cairo_surface_type_t type = cairo_surface_get_type(surface);
if (type == CAIRO_SURFACE_TYPE_IMAGE) {
return CairoFormatToGfxFormat(cairo_image_surface_get_format(surface));
}
#ifdef CAIRO_HAS_XLIB_SURFACE
// xlib is currently the only Cairo backend that creates 16bpp surfaces
if (type == CAIRO_SURFACE_TYPE_XLIB &&
cairo_xlib_surface_get_depth(surface) == 16) {
return SurfaceFormat::R5G6B5_UINT16;
}
#endif
return CairoContentToGfxFormat(cairo_surface_get_content(surface));
}
// We need to \-escape any single-quotes in the destination and URI strings,
// in order to pass them via the attributes arg to cairo_tag_begin.
//
// We also need to escape any backslashes (bug 1748077), as per doc at
// https://www.cairographics.org/manual/cairo-Tags-and-Links.html#cairo-tag-begin
//
// (Encoding of non-ASCII chars etc gets handled later by the PDF backend.)
static void EscapeForCairo(nsACString& aStr) {
for (size_t i = aStr.Length(); i > 0;) {
--i;
if (aStr[i] == '\'') {
aStr.ReplaceLiteral(i, 1, "\\'");
} else if (aStr[i] == '\\') {
aStr.ReplaceLiteral(i, 1, "\\\\");
}
}
}
void DrawTargetCairo::Link(const char* aDest, const char* aURI,
const Rect& aRect) {
if ((!aURI || !*aURI) && (!aDest || !*aDest)) {
// No destination? Just bail out.
return;
}
double x = aRect.x, y = aRect.y, w = aRect.width, h = aRect.height;
cairo_user_to_device(mContext, &x, &y);
cairo_user_to_device_distance(mContext, &w, &h);
nsPrintfCString attributes("rect=[%f %f %f %f]", x, y, w, h);
if (aDest && *aDest) {
nsAutoCString dest(aDest);
EscapeForCairo(dest);
attributes.AppendPrintf(" dest='%s'", dest.get());
}
if (aURI && *aURI) {
nsAutoCString uri(aURI);
EscapeForCairo(uri);
attributes.AppendPrintf(" uri='%s'", uri.get());
}
// We generate a begin/end pair with no content in between, because we are
// using the rect attribute of the begin tag to specify the link region
// rather than depending on cairo to accumulate the painted area.
cairo_tag_begin(mContext, CAIRO_TAG_LINK, attributes.get());
cairo_tag_end(mContext, CAIRO_TAG_LINK);
}
void DrawTargetCairo::Destination(const char* aDestination,
const Point& aPoint) {
if (!aDestination || !*aDestination) {
// No destination? Just bail out.
return;
}
nsAutoCString dest(aDestination);
EscapeForCairo(dest);
double x = aPoint.x, y = aPoint.y;
cairo_user_to_device(mContext, &x, &y);
nsPrintfCString attributes("name='%s' x=%f y=%f internal", dest.get(), x, y);
cairo_tag_begin(mContext, CAIRO_TAG_DEST, attributes.get());
cairo_tag_end(mContext, CAIRO_TAG_DEST);
}
already_AddRefed<SourceSurface> DrawTargetCairo::Snapshot() {
if (!IsValid()) {
gfxCriticalNote << "DrawTargetCairo::Snapshot with bad surface "
<< hexa(mSurface) << ", context " << hexa(mContext)
<< ", status "
<< (mSurface ? cairo_surface_status(mSurface) : -1);
return nullptr;
}
if (mSnapshot) {
RefPtr<SourceSurface> snapshot(mSnapshot);
return snapshot.forget();
}
IntSize size = GetSize();
mSnapshot = new SourceSurfaceCairo(mSurface, size,
GfxFormatForCairoSurface(mSurface), this);
RefPtr<SourceSurface> snapshot(mSnapshot);
return snapshot.forget();
}
bool DrawTargetCairo::LockBits(uint8_t** aData, IntSize* aSize,
int32_t* aStride, SurfaceFormat* aFormat,
IntPoint* aOrigin) {
cairo_surface_t* target = cairo_get_group_target(mContext);
cairo_surface_t* surf = target;
#ifdef CAIRO_HAS_WIN32_SURFACE
if (cairo_surface_get_type(surf) == CAIRO_SURFACE_TYPE_WIN32) {
cairo_surface_t* imgsurf = cairo_win32_surface_get_image(surf);
if (imgsurf) {
surf = imgsurf;
}
}
#endif
if (cairo_surface_get_type(surf) == CAIRO_SURFACE_TYPE_IMAGE &&
cairo_surface_status(surf) == CAIRO_STATUS_SUCCESS) {
PointDouble offset;
cairo_surface_get_device_offset(target, &offset.x.value, &offset.y.value);
// verify the device offset can be converted to integers suitable for a
// bounds rect
IntPoint origin(int32_t(-offset.x), int32_t(-offset.y));
if (-PointDouble(origin) != offset || (!aOrigin && origin != IntPoint())) {
return false;
}
WillChange();
Flush();
mLockedBits = cairo_image_surface_get_data(surf);
*aData = mLockedBits;
*aSize = IntSize(cairo_image_surface_get_width(surf),
cairo_image_surface_get_height(surf));
*aStride = cairo_image_surface_get_stride(surf);
*aFormat = CairoFormatToGfxFormat(cairo_image_surface_get_format(surf));
if (aOrigin) {
*aOrigin = origin;
}
return true;
}
return false;
}
void DrawTargetCairo::ReleaseBits(uint8_t* aData) {
MOZ_ASSERT(mLockedBits == aData);
mLockedBits = nullptr;
cairo_surface_t* surf = cairo_get_group_target(mContext);
#ifdef CAIRO_HAS_WIN32_SURFACE
if (cairo_surface_get_type(surf) == CAIRO_SURFACE_TYPE_WIN32) {
cairo_surface_t* imgsurf = cairo_win32_surface_get_image(surf);
if (imgsurf) {
cairo_surface_mark_dirty(imgsurf);
}
}
#endif
cairo_surface_mark_dirty(surf);
}
void DrawTargetCairo::Flush() {
cairo_surface_t* surf = cairo_get_group_target(mContext);
cairo_surface_flush(surf);
}
void DrawTargetCairo::PrepareForDrawing(cairo_t* aContext,
const Path* aPath /* = nullptr */) {
WillChange(aPath);
}
cairo_surface_t* DrawTargetCairo::GetDummySurface() {
if (mDummySurface) {
return mDummySurface;
}
mDummySurface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 1, 1);
return mDummySurface;
}
static void PaintWithAlpha(cairo_t* aContext, const DrawOptions& aOptions) {
if (aOptions.mCompositionOp == CompositionOp::OP_SOURCE) {
// Cairo treats the source operator like a lerp when alpha is < 1.
// Approximate the desired operator by: out = 0; out += src*alpha;
if (aOptions.mAlpha == 1) {
cairo_set_operator(aContext, CAIRO_OPERATOR_SOURCE);
cairo_paint(aContext);
} else {
cairo_set_operator(aContext, CAIRO_OPERATOR_CLEAR);
cairo_paint(aContext);
cairo_set_operator(aContext, CAIRO_OPERATOR_ADD);
cairo_paint_with_alpha(aContext, aOptions.mAlpha);
}
} else {
cairo_set_operator(aContext, GfxOpToCairoOp(aOptions.mCompositionOp));
cairo_paint_with_alpha(aContext, aOptions.mAlpha);
}
}
void DrawTargetCairo::DrawSurface(SourceSurface* aSurface, const Rect& aDest,
const Rect& aSource,
const DrawSurfaceOptions& aSurfOptions,
const DrawOptions& aOptions) {
if (mTransformSingular || aDest.IsEmpty()) {
return;
}
if (!IsValid() || !aSurface) {
gfxCriticalNote << "DrawSurface with bad surface "
<< cairo_surface_status(cairo_get_group_target(mContext));
return;
}
AutoPrepareForDrawing prep(this, mContext);
AutoClearDeviceOffset clear(aSurface);
float sx = aSource.Width() / aDest.Width();
float sy = aSource.Height() / aDest.Height();
cairo_matrix_t src_mat;
cairo_matrix_init_translate(&src_mat, aSource.X() - aSurface->GetRect().x,
aSource.Y() - aSurface->GetRect().y);
cairo_matrix_scale(&src_mat, sx, sy);
cairo_surface_t* surf = GetCairoSurfaceForSourceSurface(aSurface);
if (!surf) {
gfxWarning()
<< "Failed to create cairo surface for DrawTargetCairo::DrawSurface";
return;
}
cairo_pattern_t* pat = cairo_pattern_create_for_surface(surf);
cairo_surface_destroy(surf);
cairo_pattern_set_matrix(pat, &src_mat);
cairo_pattern_set_filter(
pat, GfxSamplingFilterToCairoFilter(aSurfOptions.mSamplingFilter));
// For PDF output, we avoid using EXTEND_PAD here because floating-point
// error accumulation may lead cairo_pdf_surface to conclude that padding
// is needed due to an apparent one- or two-pixel mismatch between source
// pattern and destination rect sizes when we're rendering a pdf.js page,
// and this forces undesirable fallback to the rasterization codepath
// instead of simply replaying the recording.
// (See bug 1777209.)
cairo_pattern_set_extend(
pat, cairo_surface_get_type(mSurface) == CAIRO_SURFACE_TYPE_PDF
? CAIRO_EXTEND_NONE
: CAIRO_EXTEND_PAD);
cairo_set_antialias(mContext,
GfxAntialiasToCairoAntialias(aOptions.mAntialiasMode));
// If the destination rect covers the entire clipped area, then unbounded and
// bounded operations are identical, and we don't need to push a group.
bool needsGroup = !IsOperatorBoundByMask(aOptions.mCompositionOp) &&
!aDest.Contains(GetUserSpaceClip());
cairo_translate(mContext, aDest.X(), aDest.Y());
if (needsGroup) {
cairo_push_group(mContext);
cairo_new_path(mContext);
cairo_rectangle(mContext, 0, 0, aDest.Width(), aDest.Height());
cairo_set_source(mContext, pat);
cairo_fill(mContext);
cairo_pop_group_to_source(mContext);
} else {
cairo_new_path(mContext);
cairo_rectangle(mContext, 0, 0, aDest.Width(), aDest.Height());
cairo_clip(mContext);
cairo_set_source(mContext, pat);
}
PaintWithAlpha(mContext, aOptions);
cairo_pattern_destroy(pat);
}
void DrawTargetCairo::DrawFilter(FilterNode* aNode, const Rect& aSourceRect,
const Point& aDestPoint,
const DrawOptions& aOptions) {
FilterNodeSoftware* filter = static_cast<FilterNodeSoftware*>(aNode);
filter->Draw(this, aSourceRect, aDestPoint, aOptions);
}
void DrawTargetCairo::DrawSurfaceWithShadow(SourceSurface* aSurface,
const Point& aDest,
const ShadowOptions& aShadow,
CompositionOp aOperator) {
if (!IsValid() || !aSurface) {
gfxCriticalNote << "DrawSurfaceWithShadow with bad surface "
<< cairo_surface_status(cairo_get_group_target(mContext));
return;
}
if (aSurface->GetType() != SurfaceType::CAIRO) {
return;
}
AutoClearDeviceOffset clear(aSurface);
Float width = Float(aSurface->GetSize().width);
Float height = Float(aSurface->GetSize().height);
SourceSurfaceCairo* source = static_cast<SourceSurfaceCairo*>(aSurface);
cairo_surface_t* sourcesurf = source->GetSurface();
cairo_surface_t* blursurf;
cairo_surface_t* surf;
// We only use the A8 surface for blurred shadows. Unblurred shadows can just
// use the RGBA surface directly.
if (cairo_surface_get_type(sourcesurf) == CAIRO_SURFACE_TYPE_TEE) {
blursurf = cairo_tee_surface_index(sourcesurf, 0);
surf = cairo_tee_surface_index(sourcesurf, 1);
} else {
blursurf = sourcesurf;
surf = sourcesurf;
}
if (aShadow.mSigma != 0.0f) {
MOZ_ASSERT(cairo_surface_get_type(blursurf) == CAIRO_SURFACE_TYPE_IMAGE);
Rect extents(0, 0, width, height);
AlphaBoxBlur blur(extents, cairo_image_surface_get_stride(blursurf),
aShadow.mSigma, aShadow.mSigma);
blur.Blur(cairo_image_surface_get_data(blursurf));
}
WillChange();
ClearSurfaceForUnboundedSource(aOperator);
cairo_save(mContext);
cairo_set_operator(mContext, GfxOpToCairoOp(aOperator));
cairo_identity_matrix(mContext);
cairo_translate(mContext, aDest.x, aDest.y);
bool needsGroup = !IsOperatorBoundByMask(aOperator);
if (needsGroup) {
cairo_push_group(mContext);
}
cairo_set_source_rgba(mContext, aShadow.mColor.r, aShadow.mColor.g,
aShadow.mColor.b, aShadow.mColor.a);
cairo_mask_surface(mContext, blursurf, aShadow.mOffset.x, aShadow.mOffset.y);
if (blursurf != surf || aSurface->GetFormat() != SurfaceFormat::A8) {
// Now that the shadow has been drawn, we can draw the surface on top.
cairo_set_source_surface(mContext, surf, 0, 0);
cairo_new_path(mContext);
cairo_rectangle(mContext, 0, 0, width, height);
cairo_fill(mContext);
}
if (needsGroup) {
cairo_pop_group_to_source(mContext);
cairo_paint(mContext);
}
cairo_restore(mContext);
}
void DrawTargetCairo::DrawPattern(const Pattern& aPattern,