gecko-dev/image/DecoderFactory.cpp
Seth Fowler db8c62a32b Bug 1207830 (Part 1) - Make it possible to create an anonymous decoder that downscales. r=njn
--HG--
extra : rebase_source : 620e0380750c8b4fd8752b69320d450067ce385a
2016-05-27 12:59:19 -07:00

277 lines
8.1 KiB
C++

/* -*- Mode: C++; tab-width: 2; 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 "DecoderFactory.h"
#include "nsMimeTypes.h"
#include "mozilla/RefPtr.h"
#include "nsString.h"
#include "Decoder.h"
#include "nsPNGDecoder.h"
#include "nsGIFDecoder2.h"
#include "nsJPEGDecoder.h"
#include "nsBMPDecoder.h"
#include "nsICODecoder.h"
#include "nsIconDecoder.h"
namespace mozilla {
using namespace gfx;
namespace image {
/* static */ DecoderType
DecoderFactory::GetDecoderType(const char* aMimeType)
{
// By default we don't know.
DecoderType type = DecoderType::UNKNOWN;
// PNG
if (!strcmp(aMimeType, IMAGE_PNG)) {
type = DecoderType::PNG;
} else if (!strcmp(aMimeType, IMAGE_X_PNG)) {
type = DecoderType::PNG;
// GIF
} else if (!strcmp(aMimeType, IMAGE_GIF)) {
type = DecoderType::GIF;
// JPEG
} else if (!strcmp(aMimeType, IMAGE_JPEG)) {
type = DecoderType::JPEG;
} else if (!strcmp(aMimeType, IMAGE_PJPEG)) {
type = DecoderType::JPEG;
} else if (!strcmp(aMimeType, IMAGE_JPG)) {
type = DecoderType::JPEG;
// BMP
} else if (!strcmp(aMimeType, IMAGE_BMP)) {
type = DecoderType::BMP;
} else if (!strcmp(aMimeType, IMAGE_BMP_MS)) {
type = DecoderType::BMP;
// ICO
} else if (!strcmp(aMimeType, IMAGE_ICO)) {
type = DecoderType::ICO;
} else if (!strcmp(aMimeType, IMAGE_ICO_MS)) {
type = DecoderType::ICO;
// Icon
} else if (!strcmp(aMimeType, IMAGE_ICON_MS)) {
type = DecoderType::ICON;
}
return type;
}
/* static */ already_AddRefed<Decoder>
DecoderFactory::GetDecoder(DecoderType aType,
RasterImage* aImage,
bool aIsRedecode)
{
RefPtr<Decoder> decoder;
switch (aType) {
case DecoderType::PNG:
decoder = new nsPNGDecoder(aImage);
break;
case DecoderType::GIF:
decoder = new nsGIFDecoder2(aImage);
break;
case DecoderType::JPEG:
// If we have all the data we don't want to waste cpu time doing
// a progressive decode.
decoder = new nsJPEGDecoder(aImage,
aIsRedecode ? Decoder::SEQUENTIAL
: Decoder::PROGRESSIVE);
break;
case DecoderType::BMP:
decoder = new nsBMPDecoder(aImage);
break;
case DecoderType::ICO:
decoder = new nsICODecoder(aImage);
break;
case DecoderType::ICON:
decoder = new nsIconDecoder(aImage);
break;
default:
MOZ_ASSERT_UNREACHABLE("Unknown decoder type");
}
return decoder.forget();
}
/* static */ already_AddRefed<Decoder>
DecoderFactory::CreateDecoder(DecoderType aType,
RasterImage* aImage,
SourceBuffer* aSourceBuffer,
const Maybe<IntSize>& aTargetSize,
DecoderFlags aDecoderFlags,
SurfaceFlags aSurfaceFlags,
int aSampleSize)
{
if (aType == DecoderType::UNKNOWN) {
return nullptr;
}
RefPtr<Decoder> decoder =
GetDecoder(aType, aImage, bool(aDecoderFlags & DecoderFlags::IS_REDECODE));
MOZ_ASSERT(decoder, "Should have a decoder now");
// Initialize the decoder.
decoder->SetMetadataDecode(false);
decoder->SetIterator(aSourceBuffer->Iterator());
decoder->SetDecoderFlags(aDecoderFlags | DecoderFlags::FIRST_FRAME_ONLY);
decoder->SetSurfaceFlags(aSurfaceFlags);
decoder->SetSampleSize(aSampleSize);
// Set a target size for downscale-during-decode if applicable.
if (aTargetSize) {
DebugOnly<nsresult> rv = decoder->SetTargetSize(*aTargetSize);
MOZ_ASSERT(NS_SUCCEEDED(rv), "Bad downscale-during-decode target size?");
}
decoder->Init();
if (NS_FAILED(decoder->GetDecoderError())) {
return nullptr;
}
return decoder.forget();
}
/* static */ already_AddRefed<Decoder>
DecoderFactory::CreateAnimationDecoder(DecoderType aType,
RasterImage* aImage,
SourceBuffer* aSourceBuffer,
DecoderFlags aDecoderFlags,
SurfaceFlags aSurfaceFlags)
{
if (aType == DecoderType::UNKNOWN) {
return nullptr;
}
MOZ_ASSERT(aType == DecoderType::GIF || aType == DecoderType::PNG,
"Calling CreateAnimationDecoder for non-animating DecoderType");
RefPtr<Decoder> decoder =
GetDecoder(aType, aImage, /* aIsRedecode = */ true);
MOZ_ASSERT(decoder, "Should have a decoder now");
// Initialize the decoder.
decoder->SetMetadataDecode(false);
decoder->SetIterator(aSourceBuffer->Iterator());
decoder->SetDecoderFlags(aDecoderFlags | DecoderFlags::IS_REDECODE);
decoder->SetSurfaceFlags(aSurfaceFlags);
decoder->Init();
if (NS_FAILED(decoder->GetDecoderError())) {
return nullptr;
}
return decoder.forget();
}
/* static */ already_AddRefed<Decoder>
DecoderFactory::CreateMetadataDecoder(DecoderType aType,
RasterImage* aImage,
SourceBuffer* aSourceBuffer,
int aSampleSize)
{
if (aType == DecoderType::UNKNOWN) {
return nullptr;
}
RefPtr<Decoder> decoder =
GetDecoder(aType, aImage, /* aIsRedecode = */ false);
MOZ_ASSERT(decoder, "Should have a decoder now");
// Initialize the decoder.
decoder->SetMetadataDecode(true);
decoder->SetIterator(aSourceBuffer->Iterator());
decoder->SetSampleSize(aSampleSize);
decoder->Init();
if (NS_FAILED(decoder->GetDecoderError())) {
return nullptr;
}
return decoder.forget();
}
/* static */ already_AddRefed<Decoder>
DecoderFactory::CreateAnonymousDecoder(DecoderType aType,
SourceBuffer* aSourceBuffer,
const Maybe<IntSize>& aTargetSize,
SurfaceFlags aSurfaceFlags)
{
if (aType == DecoderType::UNKNOWN) {
return nullptr;
}
RefPtr<Decoder> decoder =
GetDecoder(aType, /* aImage = */ nullptr, /* aIsRedecode = */ false);
MOZ_ASSERT(decoder, "Should have a decoder now");
// Initialize the decoder.
decoder->SetMetadataDecode(false);
decoder->SetIterator(aSourceBuffer->Iterator());
// Anonymous decoders are always transient; we don't want to optimize surfaces
// or do any other expensive work that might be wasted.
DecoderFlags decoderFlags = DecoderFlags::IMAGE_IS_TRANSIENT;
// Without an image, the decoder can't store anything in the SurfaceCache, so
// callers will only be able to retrieve the most recent frame via
// Decoder::GetCurrentFrame(). That means that anonymous decoders should
// always be first-frame-only decoders, because nobody ever wants the *last*
// frame.
decoderFlags |= DecoderFlags::FIRST_FRAME_ONLY;
decoder->SetDecoderFlags(decoderFlags);
decoder->SetSurfaceFlags(aSurfaceFlags);
// Set a target size for downscale-during-decode if applicable.
if (aTargetSize) {
DebugOnly<nsresult> rv = decoder->SetTargetSize(*aTargetSize);
MOZ_ASSERT(NS_SUCCEEDED(rv), "Bad downscale-during-decode target size?");
}
decoder->Init();
if (NS_FAILED(decoder->GetDecoderError())) {
return nullptr;
}
return decoder.forget();
}
/* static */ already_AddRefed<Decoder>
DecoderFactory::CreateAnonymousMetadataDecoder(DecoderType aType,
SourceBuffer* aSourceBuffer)
{
if (aType == DecoderType::UNKNOWN) {
return nullptr;
}
RefPtr<Decoder> decoder =
GetDecoder(aType, /* aImage = */ nullptr, /* aIsRedecode = */ false);
MOZ_ASSERT(decoder, "Should have a decoder now");
// Initialize the decoder.
decoder->SetMetadataDecode(true);
decoder->SetIterator(aSourceBuffer->Iterator());
decoder->SetDecoderFlags(DecoderFlags::FIRST_FRAME_ONLY);
decoder->Init();
if (NS_FAILED(decoder->GetDecoderError())) {
return nullptr;
}
return decoder.forget();
}
} // namespace image
} // namespace mozilla