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/* -*- 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 <cstring>
#include "2D.h"
#include "DataSurfaceHelpers.h"
#include "Logging.h"
#include "mozilla/MathAlgorithms.h"
#include "mozilla/PodOperations.h"
#include "Swizzle.h"
#include "Tools.h"
namespace mozilla {
namespace gfx {
int32_t StrideForFormatAndWidth(SurfaceFormat aFormat, int32_t aWidth) {
MOZ_ASSERT(aFormat <= SurfaceFormat::UNKNOWN);
MOZ_ASSERT(aWidth > 0);
// There's nothing special about this alignment, other than that it's what
// cairo_format_stride_for_width uses.
static const int32_t alignment = sizeof(int32_t);
const int32_t bpp = BytesPerPixel(aFormat);
if (aWidth >= (INT32_MAX - alignment) / bpp) {
return -1; // too big
}
return (bpp * aWidth + alignment - 1) & ~(alignment - 1);
}
already_AddRefed<DataSourceSurface> CreateDataSourceSurfaceFromData(
const IntSize& aSize, SurfaceFormat aFormat, const uint8_t* aData,
int32_t aDataStride) {
RefPtr<DataSourceSurface> srcSurface =
Factory::CreateWrappingDataSourceSurface(const_cast<uint8_t*>(aData),
aDataStride, aSize, aFormat);
RefPtr<DataSourceSurface> destSurface =
Factory::CreateDataSourceSurface(aSize, aFormat, false);
if (!srcSurface || !destSurface) {
return nullptr;
}
if (CopyRect(srcSurface, destSurface,
IntRect(IntPoint(), srcSurface->GetSize()), IntPoint())) {
return destSurface.forget();
}
return nullptr;
}
already_AddRefed<DataSourceSurface> CreateDataSourceSurfaceWithStrideFromData(
const IntSize& aSize, SurfaceFormat aFormat, int32_t aStride,
const uint8_t* aData, int32_t aDataStride) {
RefPtr<DataSourceSurface> srcSurface =
Factory::CreateWrappingDataSourceSurface(const_cast<uint8_t*>(aData),
aDataStride, aSize, aFormat);
RefPtr<DataSourceSurface> destSurface =
Factory::CreateDataSourceSurfaceWithStride(aSize, aFormat, aStride,
false);
if (!srcSurface || !destSurface) {
return nullptr;
}
if (CopyRect(srcSurface, destSurface,
IntRect(IntPoint(), srcSurface->GetSize()), IntPoint())) {
return destSurface.forget();
}
return nullptr;
}
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 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;
}
}
}
UniquePtr<uint8_t[]> SurfaceToPackedBGRA(DataSourceSurface* aSurface) {
SurfaceFormat format = aSurface->GetFormat();
if (format != SurfaceFormat::B8G8R8A8 && format != SurfaceFormat::B8G8R8X8) {
return nullptr;
}
IntSize size = aSurface->GetSize();
if (size.width < 0 || size.width >= INT32_MAX / 4) {
return nullptr;
}
int32_t stride = size.width * 4;
CheckedInt<size_t> bufferSize =
CheckedInt<size_t>(stride) * CheckedInt<size_t>(size.height);
if (!bufferSize.isValid()) {
return nullptr;
}
UniquePtr<uint8_t[]> imageBuffer(new (std::nothrow)
uint8_t[bufferSize.value()]);
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);
aSurface->Unmap();
if (format == SurfaceFormat::B8G8R8X8) {
// Convert BGRX to BGRA by setting a to 255.
SwizzleData(imageBuffer.get(), stride, SurfaceFormat::X8R8G8B8_UINT32,
imageBuffer.get(), stride, SurfaceFormat::A8R8G8B8_UINT32,
size);
}
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();
if (size.width < 0 || size.width >= INT32_MAX / 3) {
return nullptr;
}
int32_t stride = size.width * 3;
CheckedInt<size_t> bufferSize =
CheckedInt<size_t>(stride) * CheckedInt<size_t>(size.height);
if (!bufferSize.isValid()) {
return nullptr;
}
uint8_t* imageBuffer = new (std::nothrow) uint8_t[bufferSize.value()];
if (!imageBuffer) {
return nullptr;
}
DataSourceSurface::MappedSurface map;
if (!aSurface->Map(DataSourceSurface::MapType::READ, &map)) {
delete[] imageBuffer;
return nullptr;
}
SwizzleData(map.mData, map.mStride, SurfaceFormat::B8G8R8X8, imageBuffer,
stride, SurfaceFormat::B8G8R8, size);
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) || MOZ_UNLIKELY(aStride <= 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 " << aStride << ", "
<< aHeight << ", " << aExtraBytes;
return 0;
}
return requiredBytes.value();
}
size_t BufferSizeFromDimensions(int32_t aWidth, int32_t aHeight, int32_t aDepth,
int32_t aExtraBytes) {
if (MOZ_UNLIKELY(aHeight <= 0) || MOZ_UNLIKELY(aWidth <= 0) ||
MOZ_UNLIKELY(aDepth <= 0)) {
return 0;
}
// Similar to BufferSizeFromStrideAndHeight, but with an extra parameter.
CheckedInt32 requiredBytes =
CheckedInt32(aWidth) * CheckedInt32(aHeight) * CheckedInt32(aDepth) +
CheckedInt32(aExtraBytes);
if (MOZ_UNLIKELY(!requiredBytes.isValid())) {
gfxWarning() << "Buffer size too big; returning zero " << aWidth << ", "
<< aHeight << ", " << aDepth << ", " << aExtraBytes;
return 0;
}
return requiredBytes.value();
}
/**
* aSrcRect: Rect relative to the aSrc surface
* aDestPoint: Point inside aDest surface
*
* aSrcRect and aDestPoint are in internal local coordinates.
* i.e. locations of pixels and not in the same coordinate space
* as aSrc->GetRect()
*/
bool 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(),
"GFX: different surface formats");
MOZ_RELEASE_ASSERT(IntRect(IntPoint(), aSrc->GetSize()).Contains(aSrcRect),
"GFX: source rect too big for source surface");
MOZ_RELEASE_ASSERT(IntRect(IntPoint(), aDest->GetSize())
.Contains(IntRect(aDestPoint, aSrcRect.Size())),
"GFX: dest surface too small");
if (aSrcRect.IsEmpty()) {
return false;
}
DataSourceSurface::ScopedMap srcMap(aSrc, DataSourceSurface::READ);
DataSourceSurface::ScopedMap destMap(aDest, DataSourceSurface::WRITE);
if (MOZ2D_WARN_IF(!srcMap.IsMapped() || !destMap.IsMapped())) {
return false;
}
uint8_t* sourceData =
DataAtOffset(aSrc, srcMap.GetMappedSurface(), aSrcRect.TopLeft());
uint8_t* destData =
DataAtOffset(aDest, destMap.GetMappedSurface(), aDestPoint);
SwizzleData(sourceData, srcMap.GetStride(), aSrc->GetFormat(), destData,
destMap.GetStride(), aDest->GetFormat(), aSrcRect.Size());
return true;
}
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