gecko/gfx/thebes/gfxUtils.h

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2012-05-21 04:12:37 -07:00
* 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/. */
#ifndef GFX_UTILS_H
#define GFX_UTILS_H
#include "gfxTypes.h"
#include "gfxPattern.h"
#include "gfxImageSurface.h"
#include "ImageContainer.h"
#include "mozilla/gfx/2D.h"
#include "imgIContainer.h"
class gfxDrawable;
class nsIntRegion;
struct nsIntRect;
class gfxUtils {
public:
/*
* Premultiply or Unpremultiply aSourceSurface, writing the result
* to aDestSurface or back into aSourceSurface if aDestSurface is null.
*
* If aDestSurface is given, it must have identical format, dimensions, and
* stride as the source.
*
* If the source is not ImageFormatARGB32, no operation is performed. If
* aDestSurface is given, the data is copied over.
*/
static void PremultiplyImageSurface(gfxImageSurface *aSourceSurface,
gfxImageSurface *aDestSurface = nullptr);
static void UnpremultiplyImageSurface(gfxImageSurface *aSurface,
gfxImageSurface *aDestSurface = nullptr);
static void ConvertBGRAtoRGBA(gfxImageSurface *aSourceSurface,
gfxImageSurface *aDestSurface = nullptr);
/**
* Draw something drawable while working around limitations like bad support
* for EXTEND_PAD, lack of source-clipping, or cairo / pixman bugs with
* extreme user-space-to-image-space transforms.
*
* The input parameters here usually come from the output of our image
* snapping algorithm in nsLayoutUtils.cpp.
* This method is split from nsLayoutUtils::DrawPixelSnapped to allow for
* adjusting the parameters. For example, certain images with transparent
* margins only have a drawable subimage. For those images, imgFrame::Draw
* will tweak the rects and transforms that it gets from the pixel snapping
* algorithm before passing them on to this method.
*/
static void DrawPixelSnapped(gfxContext* aContext,
gfxDrawable* aDrawable,
const gfxMatrix& aUserSpaceToImageSpace,
const gfxRect& aSubimage,
const gfxRect& aSourceRect,
const gfxRect& aImageRect,
const gfxRect& aFill,
const gfxImageSurface::gfxImageFormat aFormat,
gfxPattern::GraphicsFilter aFilter,
uint32_t aImageFlags = imgIContainer::FLAG_NONE);
/**
* Clip aContext to the region aRegion.
*/
static void ClipToRegion(gfxContext* aContext, const nsIntRegion& aRegion);
/**
* Clip aTarget to the region aRegion.
*/
static void ClipToRegion(mozilla::gfx::DrawTarget* aTarget, const nsIntRegion& aRegion);
/**
* Clip aContext to the region aRegion, snapping the rectangles.
*/
static void ClipToRegionSnapped(gfxContext* aContext, const nsIntRegion& aRegion);
/**
* Clip aTarget to the region aRegion, snapping the rectangles.
*/
static void ClipToRegionSnapped(mozilla::gfx::DrawTarget* aTarget, const nsIntRegion& aRegion);
/**
* Create a path consisting of rectangles in |aRegion|.
*/
static void PathFromRegion(gfxContext* aContext, const nsIntRegion& aRegion);
/**
* Create a path consisting of rectangles in |aRegion|, snapping the rectangles.
*/
static void PathFromRegionSnapped(gfxContext* aContext, const nsIntRegion& aRegion);
/*
* Convert image format to depth value
*/
static int ImageFormatToDepth(gfxASurface::gfxImageFormat aFormat);
/**
* Return the transform matrix that maps aFrom to the rectangle defined by
* aToTopLeft/aToTopRight/aToBottomRight. aFrom must be
* nonempty and the destination rectangle must be axis-aligned.
*/
static gfxMatrix TransformRectToRect(const gfxRect& aFrom,
const gfxPoint& aToTopLeft,
const gfxPoint& aToTopRight,
const gfxPoint& aToBottomRight);
/**
* If aIn can be represented exactly using an nsIntRect (i.e.
* integer-aligned edges and coordinates in the int32_t range) then we
* set aOut to that rectangle, otherwise return failure.
*/
static bool GfxRectToIntRect(const gfxRect& aIn, nsIntRect* aOut);
/**
Bug 637852. Part 6: Implement resolution scaling in FrameLayerBuilder. r=tnikkel FrameLayerBuilder::BuildContainerLayerFor takes responsibility for resolution scaling. The ContainerParameters passed in are added to any transform requested. Then we extract the scale part of the transform, round the scale up to the nearest power of two if the transform may be actively animated (so we don't have to redraw layer contents constantly), pass that scale down to be applied by each child and set the residual transform on the ContainerLayer. For child layers built via BuildLayer, we just pass the requested scale factor in via the ContainerParameters. If the returned layer is a ContainerLayer then BuildLayer is guaranteed to have already done necessary scaling. If the returned layer is not a ContainerLayer then we apply the scale ourselves by adding the scale to the child layer's transform. For child ThebesLayers containing non-layer display items, we scale the drawing of those display items so that the child ThebesLayers are simply larger or smaller (larger or smaller visible regions). We have to scale all visible rects, clip rects etc that are in the coordinates of ThebesLayers or the parent ContainerLayer. To keep things simple we do this whenever we convert from appunits to integer layer coordinates. When a ThebesLayer's resolution changes we need to rerender the whole thing. nsDisplayList::PaintForFrame needs to respect the presshell's resolution setting. We do that by building a layer tree with a ContainerParameters requesting a scale up by the presshell resolution; once that layer tree is built, we adjust the root layer transform to scale back down by the resolution.
2011-06-22 05:11:27 -07:00
* Return the smallest power of kScaleResolution (2) greater than or equal to
* aVal.
*/
static gfxFloat ClampToScaleFactor(gfxFloat aVal);
/**
* Helper function for ConvertYCbCrToRGB that finds the
* RGB buffer size and format for given YCbCrImage.
* @param aSuggestedFormat will be set to ImageFormatRGB24
* if the desired format is not supported.
* @param aSuggestedSize will be set to the picture size from aData
* if either the suggested size was {0,0}
* or simultaneous scaling and conversion is not supported.
*/
static void
GetYCbCrToRGBDestFormatAndSize(const mozilla::layers::PlanarYCbCrImage::Data& aData,
gfxASurface::gfxImageFormat& aSuggestedFormat,
gfxIntSize& aSuggestedSize);
/**
* Convert YCbCrImage into RGB aDestBuffer
* Format and Size parameters must have
* been passed to GetYCbCrToRGBDestFormatAndSize
*/
static void
ConvertYCbCrToRGB(const mozilla::layers::PlanarYCbCrImage::Data& aData,
const gfxASurface::gfxImageFormat& aDestFormat,
const gfxIntSize& aDestSize,
unsigned char* aDestBuffer,
int32_t aStride);
static const uint8_t sUnpremultiplyTable[256*256];
static const uint8_t sPremultiplyTable[256*256];
#ifdef MOZ_DUMP_PAINTING
/**
* Writes a binary PNG file.
*/
static void WriteAsPNG(mozilla::gfx::DrawTarget* aDT, const char* aFile);
/**
* Write as a PNG encoded Data URL to stdout.
*/
static void DumpAsDataURL(mozilla::gfx::DrawTarget* aDT);
/**
* Copy a PNG encoded Data URL to the clipboard.
*/
static void CopyAsDataURL(mozilla::gfx::DrawTarget* aDT);
static bool sDumpPaintList;
static bool sDumpPainting;
static bool sDumpPaintingToFile;
static FILE* sDumpPaintFile;
#endif
};
namespace mozilla {
namespace gfx {
/* These techniques are suggested by "Bit Twiddling Hacks"
*/
/**
* Returns true if |aNumber| is a power of two
* 0 is incorreclty considered a power of two
*/
static inline bool
IsPowerOfTwo(int aNumber)
{
return (aNumber & (aNumber - 1)) == 0;
}
/**
* Returns the first integer greater than |aNumber| which is a power of two
* Undefined for |aNumber| < 0
*/
static inline int
NextPowerOfTwo(int aNumber)
{
#if defined(__arm__)
return 1 << (32 - __builtin_clz(aNumber - 1));
#else
--aNumber;
aNumber |= aNumber >> 1;
aNumber |= aNumber >> 2;
aNumber |= aNumber >> 4;
aNumber |= aNumber >> 8;
aNumber |= aNumber >> 16;
return ++aNumber;
#endif
}
} // namespace gfx
} // namespace mozilla
#endif