gecko-dev/image/SurfacePipe.cpp

151 строка
4.7 KiB
C++

/* -*- 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 "SurfacePipe.h"
#include <algorithm> // for min
#include "Decoder.h"
namespace mozilla {
namespace image {
using namespace gfx;
using std::min;
Maybe<SurfaceInvalidRect> AbstractSurfaceSink::TakeInvalidRect() {
if (mInvalidRect.IsEmpty()) {
return Nothing();
}
SurfaceInvalidRect invalidRect;
invalidRect.mInputSpaceRect = invalidRect.mOutputSpaceRect = mInvalidRect;
// Forget about the invalid rect we're returning.
mInvalidRect = IntRect();
return Some(invalidRect);
}
uint8_t* AbstractSurfaceSink::DoResetToFirstRow() {
mRow = 0;
return GetRowPointer();
}
uint8_t* AbstractSurfaceSink::DoAdvanceRow() {
if (mRow >= uint32_t(InputSize().height)) {
return nullptr;
}
// If we're vertically flipping the output, we need to flip the invalid rect.
// Since we're dealing with an axis-aligned rect, only the y coordinate needs
// to change.
int32_t invalidY = mFlipVertically ? InputSize().height - (mRow + 1) : mRow;
mInvalidRect.UnionRect(mInvalidRect,
IntRect(0, invalidY, InputSize().width, 1));
mRow = min(uint32_t(InputSize().height), mRow + 1);
return mRow < uint32_t(InputSize().height) ? GetRowPointer() : nullptr;
}
nsresult SurfaceSink::Configure(const SurfaceConfig& aConfig) {
// For non-paletted surfaces, the surface size is just the output size.
IntSize surfaceSize = aConfig.mOutputSize;
// Non-paletted surfaces should not have frame rects, so we just pass
// AllocateFrame() a frame rect which covers the entire surface.
IntRect frameRect(0, 0, surfaceSize.width, surfaceSize.height);
// Allocate the frame.
// XXX(seth): Once every Decoder subclass uses SurfacePipe, we probably want
// to allocate the frame directly here and get rid of Decoder::AllocateFrame
// altogether.
nsresult rv = aConfig.mDecoder->AllocateFrame(
surfaceSize, frameRect, aConfig.mFormat,
/* aPaletteDepth */ 0, aConfig.mAnimParams);
if (NS_FAILED(rv)) {
return rv;
}
mImageData = aConfig.mDecoder->mImageData;
mImageDataLength = aConfig.mDecoder->mImageDataLength;
mFlipVertically = aConfig.mFlipVertically;
MOZ_ASSERT(mImageData);
MOZ_ASSERT(
mImageDataLength ==
uint32_t(surfaceSize.width * surfaceSize.height * sizeof(uint32_t)));
ConfigureFilter(surfaceSize, sizeof(uint32_t));
return NS_OK;
}
uint8_t* SurfaceSink::GetRowPointer() const {
// If we're flipping vertically, reverse the order in which we traverse the
// rows.
uint32_t row = mFlipVertically ? InputSize().height - (mRow + 1) : mRow;
uint8_t* rowPtr = mImageData + row * InputSize().width * sizeof(uint32_t);
MOZ_ASSERT(rowPtr >= mImageData);
MOZ_ASSERT(rowPtr < mImageData + mImageDataLength);
MOZ_ASSERT(rowPtr + InputSize().width * sizeof(uint32_t) <=
mImageData + mImageDataLength);
return rowPtr;
}
nsresult PalettedSurfaceSink::Configure(const PalettedSurfaceConfig& aConfig) {
MOZ_ASSERT(aConfig.mFormat == SurfaceFormat::B8G8R8A8);
// For paletted surfaces, the surface size is the size of the frame rect.
IntSize surfaceSize = aConfig.mFrameRect.Size();
// Allocate the frame.
// XXX(seth): Once every Decoder subclass uses SurfacePipe, we probably want
// to allocate the frame directly here and get rid of Decoder::AllocateFrame
// altogether.
nsresult rv = aConfig.mDecoder->AllocateFrame(
aConfig.mOutputSize, aConfig.mFrameRect, aConfig.mFormat,
aConfig.mPaletteDepth, aConfig.mAnimParams);
if (NS_FAILED(rv)) {
return rv;
}
mImageData = aConfig.mDecoder->mImageData;
mImageDataLength = aConfig.mDecoder->mImageDataLength;
mFlipVertically = aConfig.mFlipVertically;
mFrameRect = aConfig.mFrameRect;
MOZ_ASSERT(mImageData);
MOZ_ASSERT(
mImageDataLength ==
uint32_t(mFrameRect.Width() * mFrameRect.Height() * sizeof(uint8_t)));
ConfigureFilter(surfaceSize, sizeof(uint8_t));
return NS_OK;
}
uint8_t* PalettedSurfaceSink::GetRowPointer() const {
// If we're flipping vertically, reverse the order in which we traverse the
// rows.
uint32_t row = mFlipVertically ? InputSize().height - (mRow + 1) : mRow;
uint8_t* rowPtr = mImageData + row * InputSize().width * sizeof(uint8_t);
MOZ_ASSERT(rowPtr >= mImageData);
MOZ_ASSERT(rowPtr < mImageData + mImageDataLength);
MOZ_ASSERT(rowPtr + InputSize().width * sizeof(uint8_t) <=
mImageData + mImageDataLength);
return rowPtr;
}
} // namespace image
} // namespace mozilla