mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-25 22:01:30 +00:00
294 lines
8.7 KiB
C++
294 lines
8.7 KiB
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 <cstring>
|
|
|
|
#include "2D.h"
|
|
#include "DataSurfaceHelpers.h"
|
|
#include "Logging.h"
|
|
#include "mozilla/MathAlgorithms.h"
|
|
#include "mozilla/PodOperations.h"
|
|
#include "Tools.h"
|
|
|
|
namespace mozilla {
|
|
namespace gfx {
|
|
|
|
uint8_t*
|
|
DataAtOffset(DataSourceSurface* aSurface,
|
|
const DataSourceSurface::MappedSurface* aMap,
|
|
IntPoint aPoint)
|
|
{
|
|
if (!SurfaceContainsPoint(aSurface, aPoint)) {
|
|
MOZ_CRASH("GFX: sample position needs to be inside surface!");
|
|
}
|
|
|
|
MOZ_ASSERT(Factory::CheckSurfaceSize(aSurface->GetSize()),
|
|
"surface size overflows - this should have been prevented when the surface was created");
|
|
|
|
uint8_t* data = aMap->mData + aPoint.y * aMap->mStride +
|
|
aPoint.x * BytesPerPixel(aSurface->GetFormat());
|
|
|
|
if (data < aMap->mData) {
|
|
MOZ_CRASH("GFX: out-of-range data access");
|
|
}
|
|
|
|
return data;
|
|
}
|
|
|
|
// This check is safe against integer overflow.
|
|
bool
|
|
SurfaceContainsPoint(SourceSurface* aSurface, const IntPoint& aPoint)
|
|
{
|
|
IntSize size = aSurface->GetSize();
|
|
return aPoint.x >= 0 && aPoint.x < size.width &&
|
|
aPoint.y >= 0 && aPoint.y < size.height;
|
|
}
|
|
|
|
void
|
|
ConvertBGRXToBGRA(uint8_t* aData, const IntSize &aSize, const int32_t aStride)
|
|
{
|
|
int height = aSize.height, width = aSize.width * 4;
|
|
|
|
for (int row = 0; row < height; ++row) {
|
|
for (int column = 0; column < width; column += 4) {
|
|
#ifdef IS_BIG_ENDIAN
|
|
aData[column] = 0xFF;
|
|
#else
|
|
aData[column + 3] = 0xFF;
|
|
#endif
|
|
}
|
|
aData += aStride;
|
|
}
|
|
}
|
|
|
|
void
|
|
CopySurfaceDataToPackedArray(uint8_t* aSrc, uint8_t* aDst, IntSize aSrcSize,
|
|
int32_t aSrcStride, int32_t aBytesPerPixel)
|
|
{
|
|
MOZ_ASSERT(aBytesPerPixel > 0,
|
|
"Negative stride for aDst not currently supported");
|
|
MOZ_ASSERT(BufferSizeFromStrideAndHeight(aSrcStride, aSrcSize.height) > 0,
|
|
"How did we end up with a surface with such a big buffer?");
|
|
|
|
int packedStride = aSrcSize.width * aBytesPerPixel;
|
|
|
|
if (aSrcStride == packedStride) {
|
|
// aSrc is already packed, so we can copy with a single memcpy.
|
|
memcpy(aDst, aSrc, packedStride * aSrcSize.height);
|
|
} else {
|
|
// memcpy one row at a time.
|
|
for (int row = 0; row < aSrcSize.height; ++row) {
|
|
memcpy(aDst, aSrc, packedStride);
|
|
aSrc += aSrcStride;
|
|
aDst += packedStride;
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
CopyBGRXSurfaceDataToPackedBGRArray(uint8_t* aSrc, uint8_t* aDst,
|
|
IntSize aSrcSize, int32_t aSrcStride)
|
|
{
|
|
int packedStride = aSrcSize.width * 3;
|
|
|
|
uint8_t* srcPx = aSrc;
|
|
uint8_t* dstPx = aDst;
|
|
|
|
for (int row = 0; row < aSrcSize.height; ++row) {
|
|
for (int col = 0; col < aSrcSize.width; ++col) {
|
|
dstPx[0] = srcPx[0];
|
|
dstPx[1] = srcPx[1];
|
|
dstPx[2] = srcPx[2];
|
|
// srcPx[3] (unused or alpha component) dropped on floor
|
|
srcPx += 4;
|
|
dstPx += 3;
|
|
}
|
|
srcPx = aSrc += aSrcStride;
|
|
dstPx = aDst += packedStride;
|
|
}
|
|
}
|
|
|
|
UniquePtr<uint8_t[]>
|
|
SurfaceToPackedBGRA(DataSourceSurface *aSurface)
|
|
{
|
|
SurfaceFormat format = aSurface->GetFormat();
|
|
if (format != SurfaceFormat::B8G8R8A8 && format != SurfaceFormat::B8G8R8X8) {
|
|
return nullptr;
|
|
}
|
|
|
|
IntSize size = aSurface->GetSize();
|
|
|
|
UniquePtr<uint8_t[]> imageBuffer(
|
|
new (std::nothrow) uint8_t[size.width * size.height * sizeof(uint32_t)]);
|
|
if (!imageBuffer) {
|
|
return nullptr;
|
|
}
|
|
|
|
DataSourceSurface::MappedSurface map;
|
|
if (!aSurface->Map(DataSourceSurface::MapType::READ, &map)) {
|
|
return nullptr;
|
|
}
|
|
|
|
CopySurfaceDataToPackedArray(map.mData, imageBuffer.get(), size,
|
|
map.mStride, 4 * sizeof(uint8_t));
|
|
|
|
aSurface->Unmap();
|
|
|
|
if (format == SurfaceFormat::B8G8R8X8) {
|
|
// Convert BGRX to BGRA by setting a to 255.
|
|
ConvertBGRXToBGRA(imageBuffer.get(), size, size.width * sizeof(uint32_t));
|
|
}
|
|
|
|
return imageBuffer;
|
|
}
|
|
|
|
uint8_t*
|
|
SurfaceToPackedBGR(DataSourceSurface *aSurface)
|
|
{
|
|
SurfaceFormat format = aSurface->GetFormat();
|
|
MOZ_ASSERT(format == SurfaceFormat::B8G8R8X8, "Format not supported");
|
|
|
|
if (format != SurfaceFormat::B8G8R8X8) {
|
|
// To support B8G8R8A8 we'd need to un-pre-multiply alpha
|
|
return nullptr;
|
|
}
|
|
|
|
IntSize size = aSurface->GetSize();
|
|
|
|
uint8_t* imageBuffer = new (std::nothrow) uint8_t[size.width * size.height * 3 * sizeof(uint8_t)];
|
|
if (!imageBuffer) {
|
|
return nullptr;
|
|
}
|
|
|
|
DataSourceSurface::MappedSurface map;
|
|
if (!aSurface->Map(DataSourceSurface::MapType::READ, &map)) {
|
|
delete [] imageBuffer;
|
|
return nullptr;
|
|
}
|
|
|
|
CopyBGRXSurfaceDataToPackedBGRArray(map.mData, imageBuffer, size,
|
|
map.mStride);
|
|
|
|
aSurface->Unmap();
|
|
|
|
return imageBuffer;
|
|
}
|
|
|
|
void
|
|
ClearDataSourceSurface(DataSourceSurface *aSurface)
|
|
{
|
|
DataSourceSurface::MappedSurface map;
|
|
if (!aSurface->Map(DataSourceSurface::MapType::WRITE, &map)) {
|
|
MOZ_ASSERT(false, "Failed to map DataSourceSurface");
|
|
return;
|
|
}
|
|
|
|
// We avoid writing into the gaps between the rows here since we can't be
|
|
// sure that some drivers don't use those bytes.
|
|
|
|
uint32_t width = aSurface->GetSize().width;
|
|
uint32_t bytesPerRow = width * BytesPerPixel(aSurface->GetFormat());
|
|
uint8_t* row = map.mData;
|
|
// converting to size_t here because otherwise the temporaries can overflow
|
|
// and we can end up with |end| being a bad address!
|
|
uint8_t* end = row + size_t(map.mStride) * size_t(aSurface->GetSize().height);
|
|
|
|
while (row != end) {
|
|
memset(row, 0, bytesPerRow);
|
|
row += map.mStride;
|
|
}
|
|
|
|
aSurface->Unmap();
|
|
}
|
|
|
|
size_t
|
|
BufferSizeFromStrideAndHeight(int32_t aStride,
|
|
int32_t aHeight,
|
|
int32_t aExtraBytes)
|
|
{
|
|
if (MOZ_UNLIKELY(aHeight <= 0)) {
|
|
return 0;
|
|
}
|
|
|
|
// We limit the length returned to values that can be represented by int32_t
|
|
// because we don't want to allocate buffers any bigger than that. This
|
|
// allows for a buffer size of over 2 GiB which is already rediculously
|
|
// large and will make the process janky. (Note the choice of the signed type
|
|
// is deliberate because we specifically don't want the returned value to
|
|
// overflow if someone stores the buffer length in an int32_t variable.)
|
|
|
|
CheckedInt32 requiredBytes =
|
|
CheckedInt32(aStride) * CheckedInt32(aHeight) + CheckedInt32(aExtraBytes);
|
|
if (MOZ_UNLIKELY(!requiredBytes.isValid())) {
|
|
gfxWarning() << "Buffer size too big; returning zero";
|
|
return 0;
|
|
}
|
|
return requiredBytes.value();
|
|
}
|
|
|
|
/**
|
|
* aSrcRect: Rect relative to the aSrc surface
|
|
* aDestPoint: Point inside aDest surface
|
|
*/
|
|
void
|
|
CopyRect(DataSourceSurface* aSrc, DataSourceSurface* aDest,
|
|
IntRect aSrcRect, IntPoint aDestPoint)
|
|
{
|
|
if (aSrcRect.Overflows() ||
|
|
IntRect(aDestPoint, aSrcRect.Size()).Overflows()) {
|
|
MOZ_CRASH("GFX: we should never be getting invalid rects at this point");
|
|
}
|
|
|
|
MOZ_RELEASE_ASSERT(aSrc->GetFormat() == aDest->GetFormat(),
|
|
"different surface formats");
|
|
MOZ_RELEASE_ASSERT(IntRect(IntPoint(), aSrc->GetSize()).Contains(aSrcRect),
|
|
"source rect too big for source surface");
|
|
MOZ_RELEASE_ASSERT(IntRect(IntPoint(), aDest->GetSize()).Contains(IntRect(aDestPoint, aSrcRect.Size())),
|
|
"dest surface too small");
|
|
|
|
if (aSrcRect.IsEmpty()) {
|
|
return;
|
|
}
|
|
|
|
DataSourceSurface::ScopedMap srcMap(aSrc, DataSourceSurface::READ);
|
|
DataSourceSurface::ScopedMap destMap(aDest, DataSourceSurface::WRITE);
|
|
if (MOZ2D_WARN_IF(!srcMap.IsMapped() || !destMap.IsMapped())) {
|
|
return;
|
|
}
|
|
|
|
uint8_t* sourceData = DataAtOffset(aSrc, srcMap.GetMappedSurface(), aSrcRect.TopLeft());
|
|
uint32_t sourceStride = srcMap.GetStride();
|
|
uint8_t* destData = DataAtOffset(aDest, destMap.GetMappedSurface(), aDestPoint);
|
|
uint32_t destStride = destMap.GetStride();
|
|
|
|
if (BytesPerPixel(aSrc->GetFormat()) == 4) {
|
|
for (int32_t y = 0; y < aSrcRect.height; y++) {
|
|
PodCopy((int32_t*)destData, (int32_t*)sourceData, aSrcRect.width);
|
|
sourceData += sourceStride;
|
|
destData += destStride;
|
|
}
|
|
} else if (BytesPerPixel(aSrc->GetFormat()) == 1) {
|
|
for (int32_t y = 0; y < aSrcRect.height; y++) {
|
|
PodCopy(destData, sourceData, aSrcRect.width);
|
|
sourceData += sourceStride;
|
|
destData += destStride;
|
|
}
|
|
}
|
|
}
|
|
|
|
already_AddRefed<DataSourceSurface>
|
|
CreateDataSourceSurfaceByCloning(DataSourceSurface* aSource)
|
|
{
|
|
RefPtr<DataSourceSurface> copy =
|
|
Factory::CreateDataSourceSurface(aSource->GetSize(), aSource->GetFormat(), true);
|
|
if (copy) {
|
|
CopyRect(aSource, copy, IntRect(IntPoint(), aSource->GetSize()), IntPoint());
|
|
}
|
|
return copy.forget();
|
|
}
|
|
|
|
} // namespace gfx
|
|
} // namespace mozilla
|