static already_AddRefed<TextureClient>
TexClientFromReadback(SharedSurface* src, ISurfaceAllocator* allocator,
TextureFlags baseFlags, LayersBackend layersBackend)
{
auto backendType = gfx::BackendType::CAIRO;
TexClientFactory factory(allocator, src->mHasAlpha, src->mSize, backendType,
baseFlags, layersBackend);
RefPtr<TextureClient> texClient;
{
gl::ScopedReadbackFB autoReadback(src);
// We have a source FB, now we need a format.
GLenum destFormat = LOCAL_GL_BGRA;
GLenum destType = LOCAL_GL_UNSIGNED_BYTE;
GLenum readFormat;
GLenum readType;
// We actually don't care if they match, since we can handle
// any read{Format,Type} we get.
auto gl = src->mGL;
GetActualReadFormats(gl, destFormat, destType, &readFormat, &readType);
MOZ_ASSERT(readFormat == LOCAL_GL_RGBA ||
readFormat == LOCAL_GL_BGRA);
MOZ_ASSERT(readType == LOCAL_GL_UNSIGNED_BYTE);
// With a format and type, we can create texClient.
if (readFormat == LOCAL_GL_BGRA &&
readType == LOCAL_GL_UNSIGNED_BYTE)
{
// 0xAARRGGBB
// In Lendian: [BB, GG, RR, AA]
texClient = factory.CreateB8G8R8AX8();
} else if (readFormat == LOCAL_GL_RGBA &&
readType == LOCAL_GL_UNSIGNED_BYTE)
{
// [RR, GG, BB, AA]
texClient = factory.CreateR8G8B8AX8();
} else {
MOZ_CRASH("GFX: Bad `read{Format,Type}`.");
}
MOZ_ASSERT(texClient);
if (!texClient)
return nullptr;
// With a texClient, we can lock for writing.
TextureClientAutoLock autoLock(texClient, OpenMode::OPEN_WRITE);
DebugOnly<bool> succeeded = autoLock.Succeeded();
MOZ_ASSERT(succeeded, "texture should have locked");
MappedTextureData mapped;
texClient->BorrowMappedData(mapped);
// ReadPixels from the current FB into mapped.data.
auto width = src->mSize.width;
auto height = src->mSize.height;
{
ScopedPackAlignment autoAlign(gl, 4);
MOZ_ASSERT(mapped.stride/4 == mapped.size.width);
gl->raw_fReadPixels(0, 0, width, height, readFormat, readType, mapped.data);
}
// RB_SWAPPED doesn't work with D3D11. (bug 1051010)
// RB_SWAPPED doesn't work with Basic. (bug ???????)
// RB_SWAPPED doesn't work with D3D9. (bug ???????)
bool layersNeedsManualSwap = layersBackend == LayersBackend::LAYERS_BASIC ||
layersBackend == LayersBackend::LAYERS_D3D9 ||
layersBackend == LayersBackend::LAYERS_D3D11;
if (texClient->HasFlags(TextureFlags::RB_SWAPPED) &&
layersNeedsManualSwap)
{
size_t pixels = width * height;
uint8_t* itr = mapped.data;
for (size_t i = 0; i < pixels; i++) {
SwapRB_R8G8B8A8(itr);
itr += 4;
}
texClient->RemoveFlags(TextureFlags::RB_SWAPPED);
}
}
return texClient.forget();
}
bool
ReadbackSharedSurface(SharedSurface* src, gfx::DrawTarget* dst)
{
AutoLockBits lock(dst);
uint8_t* dstBytes;
gfx::IntSize dstSize;
int32_t dstStride;
gfx::SurfaceFormat dstFormat;
if (!lock.Lock(&dstBytes, &dstSize, &dstStride, &dstFormat))
return false;
const bool isDstRGBA = (dstFormat == gfx::SurfaceFormat::R8G8B8A8 ||
dstFormat == gfx::SurfaceFormat::R8G8B8X8);
MOZ_ASSERT_IF(!isDstRGBA, dstFormat == gfx::SurfaceFormat::B8G8R8A8 ||
dstFormat == gfx::SurfaceFormat::B8G8R8X8);
size_t width = src->mSize.width;
size_t height = src->mSize.height;
MOZ_ASSERT(width == (size_t)dstSize.width);
MOZ_ASSERT(height == (size_t)dstSize.height);
GLenum readGLFormat;
GLenum readType;
{
ScopedReadbackFB autoReadback(src);
// We have a source FB, now we need a format.
GLenum dstGLFormat = isDstRGBA ? LOCAL_GL_BGRA : LOCAL_GL_RGBA;
GLenum dstType = LOCAL_GL_UNSIGNED_BYTE;
// We actually don't care if they match, since we can handle
// any read{Format,Type} we get.
GLContext* gl = src->mGL;
GetActualReadFormats(gl, dstGLFormat, dstType, &readGLFormat,
&readType);
MOZ_ASSERT(readGLFormat == LOCAL_GL_RGBA ||
readGLFormat == LOCAL_GL_BGRA);
MOZ_ASSERT(readType == LOCAL_GL_UNSIGNED_BYTE);
// ReadPixels from the current FB into lockedBits.
{
size_t alignment = 8;
if (dstStride % 4 == 0)
alignment = 4;
ScopedPackAlignment autoAlign(gl, alignment);
gl->raw_fReadPixels(0, 0, width, height, readGLFormat, readType,
dstBytes);
}
}
const bool isReadRGBA = readGLFormat == LOCAL_GL_RGBA;
if (isReadRGBA != isDstRGBA) {
for (size_t j = 0; j < height; ++j) {
uint8_t* rowItr = dstBytes + j*dstStride;
uint8_t* rowEnd = rowItr + 4*width;
while (rowItr != rowEnd) {
Swap(rowItr[0], rowItr[2]);
rowItr += 4;
}
}
}
return true;
}