gecko/gfx/layers/basic/BasicImages.cpp

314 lines
8.8 KiB
C++

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Corporation code.
*
* The Initial Developer of the Original Code is Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Robert O'Callahan <robert@ocallahan.org>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "mozilla/Monitor.h"
#include "ImageLayers.h"
#include "BasicLayers.h"
#include "gfxImageSurface.h"
#ifdef XP_MACOSX
#include "gfxQuartzImageSurface.h"
#endif
#include "cairo.h"
#include "yuv_convert.h"
using mozilla::Monitor;
namespace mozilla {
namespace layers {
/**
* All our images can yield up a cairo surface and their size.
*/
class BasicImageImplData {
public:
/**
* This must be called on the main thread.
*/
virtual already_AddRefed<gfxASurface> GetAsSurface() = 0;
gfxIntSize GetSize() { return mSize; }
protected:
gfxIntSize mSize;
};
/**
* Since BasicLayers only paint on the main thread, handling a CairoImage
* is extremely simple. We just hang on to a reference to the surface and
* return that surface when BasicImageLayer::Paint asks for it via
* BasicImageContainer::GetAsSurface.
*/
class BasicCairoImage : public CairoImage, public BasicImageImplData {
public:
BasicCairoImage() : CairoImage(static_cast<BasicImageImplData*>(this)) {}
virtual void SetData(const Data& aData)
{
mSurface = aData.mSurface;
mSize = aData.mSize;
}
virtual already_AddRefed<gfxASurface> GetAsSurface()
{
NS_ASSERTION(NS_IsMainThread(), "Must be main thread");
nsRefPtr<gfxASurface> surface = mSurface.get();
return surface.forget();
}
protected:
nsCountedRef<nsMainThreadSurfaceRef> mSurface;
};
/**
* We handle YCbCr by converting to RGB when the image is initialized
* (which should be done off the main thread). The RGB results are stored
* in a memory buffer and converted to a cairo surface lazily.
*/
class BasicPlanarYCbCrImage : public PlanarYCbCrImage, public BasicImageImplData {
public:
BasicPlanarYCbCrImage() :
PlanarYCbCrImage(static_cast<BasicImageImplData*>(this))
{}
virtual void SetData(const Data& aData);
virtual already_AddRefed<gfxASurface> GetAsSurface();
protected:
nsAutoArrayPtr<PRUint8> mBuffer;
nsCountedRef<nsMainThreadSurfaceRef> mSurface;
};
void
BasicPlanarYCbCrImage::SetData(const Data& aData)
{
// Do some sanity checks to prevent integer overflow
if (aData.mYSize.width > 16384 || aData.mYSize.height > 16384) {
NS_ERROR("Illegal width or height");
return;
}
size_t size = aData.mPicSize.width*aData.mPicSize.height*4;
mBuffer = new PRUint8[size];
if (!mBuffer) {
// out of memory
return;
}
gfx::YUVType type = gfx::YV12;
if (aData.mYSize.width == aData.mCbCrSize.width &&
aData.mYSize.height == aData.mCbCrSize.height) {
type = gfx::YV24;
}
else if (aData.mYSize.width / 2 == aData.mCbCrSize.width &&
aData.mYSize.height == aData.mCbCrSize.height) {
type = gfx::YV16;
}
else if (aData.mYSize.width / 2 == aData.mCbCrSize.width &&
aData.mYSize.height / 2 == aData.mCbCrSize.height ) {
type = gfx::YV12;
}
else {
NS_ERROR("YCbCr format not supported");
}
// Convert from YCbCr to RGB now
gfx::ConvertYCbCrToRGB32(aData.mYChannel,
aData.mCbChannel,
aData.mCrChannel,
mBuffer,
aData.mPicX,
aData.mPicY,
aData.mPicSize.width,
aData.mPicSize.height,
aData.mYStride,
aData.mCbCrStride,
aData.mPicSize.width*4,
type);
mSize = aData.mPicSize;
}
static cairo_user_data_key_t imageSurfaceDataKey;
static void
DestroyBuffer(void* aBuffer)
{
delete[] static_cast<PRUint8*>(aBuffer);
}
already_AddRefed<gfxASurface>
BasicPlanarYCbCrImage::GetAsSurface()
{
NS_ASSERTION(NS_IsMainThread(), "Must be main thread");
if (mSurface) {
nsRefPtr<gfxASurface> result = mSurface.get();
return result.forget();
}
if (!mBuffer) {
return nsnull;
}
nsRefPtr<gfxImageSurface> imgSurface =
new gfxImageSurface(mBuffer, mSize,
mSize.width * 4,
gfxASurface::ImageFormatRGB24);
if (!imgSurface) {
return nsnull;
}
// Pass ownership of the buffer to the surface
imgSurface->SetData(&imageSurfaceDataKey, mBuffer.forget(), DestroyBuffer);
nsRefPtr<gfxASurface> result = imgSurface.get();
#if defined(XP_MACOSX)
nsRefPtr<gfxQuartzImageSurface> quartzSurface =
new gfxQuartzImageSurface(imgSurface);
if (quartzSurface) {
result = quartzSurface.forget();
}
#endif
mSurface = result.get();
return result.forget();
}
/**
* Our image container is very simple. It's really just a factory
* for the image objects. We use a Monitor to synchronize access to
* mImage.
*/
class BasicImageContainer : public ImageContainer {
public:
BasicImageContainer(BasicLayerManager* aManager) :
ImageContainer(aManager), mMonitor("BasicImageContainer")
{}
virtual already_AddRefed<Image> CreateImage(const Image::Format* aFormats,
PRUint32 aNumFormats);
virtual void SetCurrentImage(Image* aImage);
virtual already_AddRefed<Image> GetCurrentImage();
virtual already_AddRefed<gfxASurface> GetCurrentAsSurface(gfxIntSize* aSize);
virtual gfxIntSize GetCurrentSize();
protected:
Monitor mMonitor;
nsRefPtr<Image> mImage;
};
/**
* Returns true if aFormat is in the given format array.
*/
static PRBool
FormatInList(const Image::Format* aFormats, PRUint32 aNumFormats,
Image::Format aFormat)
{
for (PRUint32 i = 0; i < aNumFormats; ++i) {
if (aFormats[i] == aFormat) {
return PR_TRUE;
}
}
return PR_FALSE;
}
already_AddRefed<Image>
BasicImageContainer::CreateImage(const Image::Format* aFormats,
PRUint32 aNumFormats)
{
nsRefPtr<Image> image;
// Prefer cairo surfaces because they're native for us
if (FormatInList(aFormats, aNumFormats, Image::CAIRO_SURFACE)) {
image = new BasicCairoImage();
} else if (FormatInList(aFormats, aNumFormats, Image::PLANAR_YCBCR)) {
image = new BasicPlanarYCbCrImage();
}
return image.forget();
}
void
BasicImageContainer::SetCurrentImage(Image* aImage)
{
MonitorAutoEnter mon(mMonitor);
mImage = aImage;
}
already_AddRefed<Image>
BasicImageContainer::GetCurrentImage()
{
MonitorAutoEnter mon(mMonitor);
nsRefPtr<Image> image = mImage;
return image.forget();
}
static BasicImageImplData*
ToImageData(Image* aImage)
{
return static_cast<BasicImageImplData*>(aImage->GetImplData());
}
already_AddRefed<gfxASurface>
BasicImageContainer::GetCurrentAsSurface(gfxIntSize* aSizeResult)
{
NS_PRECONDITION(NS_IsMainThread(), "Must be called on main thread");
MonitorAutoEnter mon(mMonitor);
if (!mImage) {
return nsnull;
}
*aSizeResult = ToImageData(mImage)->GetSize();
return ToImageData(mImage)->GetAsSurface();
}
gfxIntSize
BasicImageContainer::GetCurrentSize()
{
MonitorAutoEnter mon(mMonitor);
return !mImage ? gfxIntSize(0,0) : ToImageData(mImage)->GetSize();
}
already_AddRefed<ImageContainer>
BasicLayerManager::CreateImageContainer()
{
nsRefPtr<ImageContainer> container = new BasicImageContainer(this);
return container.forget();
}
}
}