gecko-dev/gfx/2d/SourceSurfaceCG.cpp

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C++

/* -*- 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 "SourceSurfaceCG.h"
#include "DrawTargetCG.h"
#include "QuartzSupport.h"
namespace mozilla {
namespace gfx {
SourceSurfaceCG::~SourceSurfaceCG()
{
CGImageRelease(mImage);
}
IntSize
SourceSurfaceCG::GetSize() const
{
IntSize size;
size.width = CGImageGetWidth(mImage);
size.height = CGImageGetHeight(mImage);
return size;
}
SurfaceFormat
SourceSurfaceCG::GetFormat() const
{
return mFormat;
}
TemporaryRef<DataSourceSurface>
SourceSurfaceCG::GetDataSurface()
{
//XXX: we should be more disciplined about who takes a reference and where
CGImageRetain(mImage);
RefPtr<DataSourceSurfaceCG> dataSurf =
new DataSourceSurfaceCG(mImage);
return dataSurf;
}
static void releaseCallback(void *info, const void *data, size_t size) {
free(info);
}
static CGImageRef
CreateCGImage(void *aInfo,
const void *aData,
const IntSize &aSize,
int32_t aStride,
SurfaceFormat aFormat)
{
//XXX: we should avoid creating this colorspace everytime
CGColorSpaceRef colorSpace = nullptr;
CGBitmapInfo bitinfo = 0;
int bitsPerComponent = 0;
int bitsPerPixel = 0;
switch (aFormat) {
case FORMAT_B8G8R8A8:
colorSpace = CGColorSpaceCreateDeviceRGB();
bitinfo = kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host;
bitsPerComponent = 8;
bitsPerPixel = 32;
break;
case FORMAT_B8G8R8X8:
colorSpace = CGColorSpaceCreateDeviceRGB();
bitinfo = kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Host;
bitsPerComponent = 8;
bitsPerPixel = 32;
break;
case FORMAT_A8:
// XXX: why don't we set a colorspace here?
bitsPerComponent = 8;
bitsPerPixel = 8;
break;
default:
MOZ_CRASH();
}
CGDataProviderRef dataProvider = CGDataProviderCreateWithData(aInfo,
aData,
aSize.height * aStride,
releaseCallback);
CGImageRef image;
if (aFormat == FORMAT_A8) {
CGFloat decode[] = {1.0, 0.0};
image = CGImageMaskCreate (aSize.width, aSize.height,
bitsPerComponent,
bitsPerPixel,
aStride,
dataProvider,
decode,
true);
} else {
image = CGImageCreate (aSize.width, aSize.height,
bitsPerComponent,
bitsPerPixel,
aStride,
colorSpace,
bitinfo,
dataProvider,
nullptr,
true,
kCGRenderingIntentDefault);
}
CGDataProviderRelease(dataProvider);
CGColorSpaceRelease(colorSpace);
return image;
}
bool
SourceSurfaceCG::InitFromData(unsigned char *aData,
const IntSize &aSize,
int32_t aStride,
SurfaceFormat aFormat)
{
assert(aSize.width >= 0 && aSize.height >= 0);
void *data = malloc(aStride * aSize.height);
memcpy(data, aData, aStride * aSize.height);
mFormat = aFormat;
mImage = CreateCGImage(data, data, aSize, aStride, aFormat);
return mImage != nullptr;
}
DataSourceSurfaceCG::~DataSourceSurfaceCG()
{
CGImageRelease(mImage);
free(CGBitmapContextGetData(mCg));
CGContextRelease(mCg);
}
IntSize
DataSourceSurfaceCG::GetSize() const
{
IntSize size;
size.width = CGImageGetWidth(mImage);
size.height = CGImageGetHeight(mImage);
return size;
}
bool
DataSourceSurfaceCG::InitFromData(unsigned char *aData,
const IntSize &aSize,
int32_t aStride,
SurfaceFormat aFormat)
{
void *data = malloc(aStride * aSize.height);
memcpy(data, aData, aStride * aSize.height);
mImage = CreateCGImage(data, data, aSize, aStride, aFormat);
return mImage;
}
CGContextRef CreateBitmapContextForImage(CGImageRef image)
{
CGColorSpaceRef colorSpace;
size_t width = CGImageGetWidth(image);
size_t height = CGImageGetHeight(image);
int bitmapBytesPerRow = (width * 4);
int bitmapByteCount = (bitmapBytesPerRow * height);
void *data = calloc(bitmapByteCount, 1);
//XXX: which color space should we be using here?
colorSpace = CGColorSpaceCreateDeviceRGB();
assert(colorSpace);
// we'd like to pass nullptr as the first parameter
// to let Quartz manage this memory for us. However,
// on 10.5 and older CGBitmapContextGetData will return
// nullptr instead of the associated buffer so we need
// to manage it ourselves.
CGContextRef cg = CGBitmapContextCreate(data,
width,
height,
8,
bitmapBytesPerRow,
colorSpace,
kCGBitmapByteOrder32Host | kCGImageAlphaPremultipliedFirst);
assert(cg);
CGColorSpaceRelease(colorSpace);
return cg;
}
DataSourceSurfaceCG::DataSourceSurfaceCG(CGImageRef aImage)
{
mImage = aImage;
mCg = CreateBitmapContextForImage(aImage);
if (mCg == nullptr) {
// error creating context
return;
}
// Get image width, height. We'll use the entire image.
CGFloat w = CGImageGetWidth(aImage);
CGFloat h = CGImageGetHeight(aImage);
CGRect rect = {{0,0},{w,h}};
// Draw the image to the bitmap context. Once we draw, the memory
// allocated for the context for rendering will then contain the
// raw image data in the specified color space.
CGContextDrawImage(mCg, rect, aImage);
// Now we can get a pointer to the image data associated with the bitmap
// context.
mData = CGBitmapContextGetData(mCg);
assert(mData);
}
unsigned char *
DataSourceSurfaceCG::GetData()
{
// See http://developer.apple.com/library/mac/#qa/qa1509/_index.html
// the following only works on 10.5+, the Q&A above suggests a method
// that can be used for earlier versions
//CFDataRef data = CGDataProviderCopyData(CGImageGetDataProvider(cgImage));
//unsigned char *dataPtr = CFDataGetBytePtr(data);
//CFDataRelease(data);
// unfortunately the the method above only works for read-only access and
// we need read-write for DataSourceSurfaces
return (unsigned char*)mData;
}
SourceSurfaceCGBitmapContext::SourceSurfaceCGBitmapContext(DrawTargetCG *aDrawTarget)
{
mDrawTarget = aDrawTarget;
mCg = (CGContextRef)aDrawTarget->GetNativeSurface(NATIVE_SURFACE_CGCONTEXT);
if (!mCg)
abort();
mSize.width = CGBitmapContextGetWidth(mCg);
mSize.height = CGBitmapContextGetHeight(mCg);
mStride = CGBitmapContextGetBytesPerRow(mCg);
mData = CGBitmapContextGetData(mCg);
mImage = nullptr;
}
void SourceSurfaceCGBitmapContext::EnsureImage() const
{
// Instead of using CGBitmapContextCreateImage we create
// a CGImage around the data associated with the CGBitmapContext
// we do this to avoid the vm_copy that CGBitmapContextCreateImage.
// vm_copy tends to cause all sorts of unexpected performance problems
// because of the mm tricks that vm_copy does. Using a regular
// memcpy when the bitmap context is modified gives us more predictable
// performance characteristics.
if (!mImage) {
void *info;
if (mCg) {
// if we have an mCg than it owns the data
// and we don't want to tranfer ownership
// to the CGDataProviderCreateWithData
info = nullptr;
} else {
// otherwise we transfer ownership to
// the dataProvider
info = mData;
}
if (!mData) abort();
mImage = CreateCGImage(info, mData, mSize, mStride, FORMAT_B8G8R8A8);
}
}
IntSize
SourceSurfaceCGBitmapContext::GetSize() const
{
return mSize;
}
void
SourceSurfaceCGBitmapContext::DrawTargetWillChange()
{
if (mDrawTarget) {
// This will break the weak reference we hold to mCg
size_t stride = CGBitmapContextGetBytesPerRow(mCg);
size_t height = CGBitmapContextGetHeight(mCg);
//XXX: infalliable malloc?
mData = malloc(stride * height);
// copy out the data from the CGBitmapContext
// we'll maintain ownership of mData until
// we transfer it to mImage
memcpy(mData, CGBitmapContextGetData(mCg), stride*height);
// drop the current image for the data associated with the CGBitmapContext
if (mImage)
CGImageRelease(mImage);
mImage = nullptr;
mCg = nullptr;
mDrawTarget = nullptr;
}
}
SourceSurfaceCGBitmapContext::~SourceSurfaceCGBitmapContext()
{
if (!mImage && !mCg) {
// neither mImage or mCg owns the data
free(mData);
}
if (mImage)
CGImageRelease(mImage);
}
SourceSurfaceCGIOSurfaceContext::SourceSurfaceCGIOSurfaceContext(DrawTargetCG *aDrawTarget)
{
CGContextRef cg = (CGContextRef)aDrawTarget->GetNativeSurface(NATIVE_SURFACE_CGCONTEXT_ACCELERATED);
RefPtr<MacIOSurface> surf = MacIOSurface::IOSurfaceContextGetSurface(cg);
mSize.width = surf->GetWidth();
mSize.height = surf->GetHeight();
// TODO use CreateImageFromIOSurfaceContext instead of reading back the surface
//mImage = MacIOSurface::CreateImageFromIOSurfaceContext(cg);
mImage = nullptr;
aDrawTarget->Flush();
surf->Lock();
size_t bytesPerRow = surf->GetBytesPerRow();
size_t ioHeight = surf->GetHeight();
void* ioData = surf->GetBaseAddress();
// XXX If the width is much less then the stride maybe
// we should repack the image?
mData = malloc(ioHeight*bytesPerRow);
memcpy(mData, ioData, ioHeight*(bytesPerRow));
mStride = bytesPerRow;
surf->Unlock();
}
void SourceSurfaceCGIOSurfaceContext::EnsureImage() const
{
// TODO Use CreateImageFromIOSurfaceContext and remove this
// Instead of using CGBitmapContextCreateImage we create
// a CGImage around the data associated with the CGBitmapContext
// we do this to avoid the vm_copy that CGBitmapContextCreateImage.
// vm_copy tends to cause all sorts of unexpected performance problems
// because of the mm tricks that vm_copy does. Using a regular
// memcpy when the bitmap context is modified gives us more predictable
// performance characteristics.
if (!mImage) {
mImage = CreateCGImage(mData, mData, mSize, mStride, FORMAT_B8G8R8A8);
}
}
IntSize
SourceSurfaceCGIOSurfaceContext::GetSize() const
{
return mSize;
}
void
SourceSurfaceCGIOSurfaceContext::DrawTargetWillChange()
{
}
SourceSurfaceCGIOSurfaceContext::~SourceSurfaceCGIOSurfaceContext()
{
if (mImage)
CGImageRelease(mImage);
else
free(mData);
}
unsigned char*
SourceSurfaceCGIOSurfaceContext::GetData()
{
return (unsigned char*)mData;
}
}
}