mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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129 lines
3.6 KiB
C++
129 lines
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/layers/ImageDataSerializer.h"
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#include "gfxImageSurface.h"
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#include "mozilla/gfx/2D.h"
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#include "gfx2DGlue.h"
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#include "mozilla/gfx/Tools.h"
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namespace mozilla {
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namespace layers {
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// The Data is layed out as follows:
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//
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// +-------------------+ -++ --+ <-- ImageDataSerializerBase::mData pointer
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// | SurfaceBufferInfo | | |
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// +-------------------+ --+ | offset
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// | ... | |
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// +-------------------+ ------+
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// | |
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// | data |
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// | |
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// +-------------------+
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// Structure written at the beginning of the data blob containing the image
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// (as shown in the figure above). It contains the necessary informations to
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// read the image in the blob.
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namespace {
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struct SurfaceBufferInfo
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{
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uint32_t width;
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uint32_t height;
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gfx::SurfaceFormat format;
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static uint32_t GetOffset()
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{
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return gfx::GetAlignedStride<16>(sizeof(SurfaceBufferInfo));
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}
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};
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} // anonymous namespace
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static SurfaceBufferInfo* GetBufferInfo(uint8_t* aBuffer)
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{
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return reinterpret_cast<SurfaceBufferInfo*>(aBuffer);
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}
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void
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ImageDataSerializer::InitializeBufferInfo(gfx::IntSize aSize,
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gfx::SurfaceFormat aFormat)
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{
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SurfaceBufferInfo* info = GetBufferInfo(mData);
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info->width = aSize.width;
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info->height = aSize.height;
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info->format = aFormat;
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}
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uint32_t
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ImageDataSerializer::ComputeMinBufferSize(gfx::IntSize aSize,
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gfx::SurfaceFormat aFormat)
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{
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// Note that at the moment we pack the image data with the minimum possible
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// stride, we may decide to change that if we want aligned stride.
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uint32_t bufsize = aSize.height * gfx::BytesPerPixel(aFormat) * aSize.width;
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return SurfaceBufferInfo::GetOffset()
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+ gfx::GetAlignedStride<16>(bufsize);
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}
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bool
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ImageDataSerializerBase::IsValid() const
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{
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// XXX - We could use some sanity checks here.
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return !!mData;
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}
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uint8_t*
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ImageDataSerializerBase::GetData()
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{
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MOZ_ASSERT(IsValid());
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return mData + SurfaceBufferInfo::GetOffset();
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}
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gfx::IntSize
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ImageDataSerializerBase::GetSize() const
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{
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MOZ_ASSERT(IsValid());
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SurfaceBufferInfo* info = GetBufferInfo(mData);
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return gfx::IntSize(info->width, info->height);
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}
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gfx::SurfaceFormat
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ImageDataSerializerBase::GetFormat() const
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{
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MOZ_ASSERT(IsValid());
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return GetBufferInfo(mData)->format;
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}
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TemporaryRef<gfxImageSurface>
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ImageDataSerializerBase::GetAsThebesSurface()
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{
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MOZ_ASSERT(IsValid());
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SurfaceBufferInfo* info = GetBufferInfo(mData);
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uint32_t stride = gfxASurface::BytesPerPixel(
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gfx::SurfaceFormatToImageFormat(GetFormat())) * info->width;
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gfxIntSize size(info->width, info->height);
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RefPtr<gfxImageSurface> surf =
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new gfxImageSurface(GetData(), size, stride,
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gfx::SurfaceFormatToImageFormat(GetFormat()));
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return surf.forget();
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}
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TemporaryRef<gfx::DataSourceSurface>
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ImageDataSerializerBase::GetAsSurface()
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{
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MOZ_ASSERT(IsValid());
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SurfaceBufferInfo* info = GetBufferInfo(mData);
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gfx::IntSize size(info->width, info->height);
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uint32_t stride = gfxASurface::BytesPerPixel(
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gfx::SurfaceFormatToImageFormat(GetFormat())) * info->width;
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RefPtr<gfx::DataSourceSurface> surf =
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gfx::Factory::CreateWrappingDataSourceSurface(GetData(), stride, size, GetFormat());
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return surf.forget();
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}
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} // namespace layers
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} // namespace mozilla
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