bool
DataSourceSurfaceCG::InitFromData(unsigned char *aData,
const IntSize &aSize,
int32_t aStride,
SurfaceFormat aFormat)
{
if (aSize.width <= 0 || aSize.height <= 0) {
return false;
}
size_t bufLen = BufferSizeFromStrideAndHeight(aStride, aSize.height);
if (bufLen == 0) {
mImage = nullptr;
return false;
}
void *data = malloc(bufLen);
memcpy(data, aData, bufLen - aStride + (aSize.width * BytesPerPixel(aFormat)));
mFormat = aFormat;
mImage = CreateCGImage(data, data, aSize, aStride, aFormat);
if (!mImage) {
free(data);
return false;
}
return true;
}
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, mFormat);
}
}
CGImageRef
CreateCGImage(void *aInfo,
const void *aData,
const IntSize &aSize,
int32_t aStride,
SurfaceFormat aFormat)
{
return CreateCGImage(releaseCallback,
aInfo,
aData,
aSize,
aStride,
aFormat);
}
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) {
if (!mData) abort();
mImage = CreateCGImage(nullptr, mData, mSize, mStride, mFormat);
}
}
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);
// Copy all the data except the stride padding on the very last
// row since we can't guarantee that is readable.
memcpy(data, aData, aStride * (aSize.height - 1) + (aSize.width * BytesPerPixel(aFormat)));
mFormat = aFormat;
mImage = CreateCGImage(data, data, aSize, aStride, aFormat);
return mImage != nullptr;
}
bool
DataSourceSurfaceCG::InitFromData(unsigned char *aData,
const IntSize &aSize,
int32_t aStride,
SurfaceFormat aFormat)
{
if (aSize.width <= 0 || aSize.height <= 0) {
return false;
}
void *data = malloc(aStride * aSize.height);
memcpy(data, aData, aStride * (aSize.height - 1) + (aSize.width * BytesPerPixel(aFormat)));
mFormat = aFormat;
mImage = CreateCGImage(data, data, aSize, aStride, aFormat);
if (!mImage) {
free(data);
return false;
}
return true;
}
