/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- * 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 "GraphicsFilter.h" #include "imgIContainer.h" #include "mozilla/gfx/2D.h" #include "mozilla/RefPtr.h" class gfxDrawable; class nsIntRegion; struct nsIntRect; namespace mozilla { namespace layers { class PlanarYCbCrData; } } class gfxUtils { public: typedef mozilla::gfx::DataSourceSurface DataSourceSurface; typedef mozilla::gfx::IntPoint IntPoint; typedef mozilla::gfx::Matrix Matrix; typedef mozilla::gfx::SourceSurface SourceSurface; typedef mozilla::gfx::SurfaceFormat SurfaceFormat; /* * 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 gfxImageFormat::ARGB32, 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 mozilla::TemporaryRef UnpremultiplyDataSurface(DataSourceSurface* aSurface); static void ConvertBGRAtoRGBA(gfxImageSurface *aSourceSurface, gfxImageSurface *aDestSurface = nullptr); static void ConvertBGRAtoRGBA(uint8_t* aData, uint32_t aLength); /** * 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 gfxImageFormat aFormat, 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(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); static Matrix TransformRectToRect(const gfxRect& aFrom, const IntPoint& aToTopLeft, const IntPoint& aToTopRight, const IntPoint& 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); /** * 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 gfxImageFormat::RGB24 * 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::PlanarYCbCrData& aData, 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::PlanarYCbCrData& aData, const gfxImageFormat& aDestFormat, const gfxIntSize& aDestSize, unsigned char* aDestBuffer, int32_t aStride); /** * Creates a copy of aSurface, but having the SurfaceFormat aFormat. * * This function always creates a new surface. Do not call it if aSurface's * format is the same as aFormat. Such a non-conversion would just be an * unnecessary and wasteful copy (this function asserts to prevent that). * * This function is intended to be called by code that needs to access the * pixel data of the surface, but doesn't want to have lots of branches * to handle different pixel data formats (code which would become out of * date if and when new formats are added). Callers can use this function * to copy the surface to a specified format so that they only have to * handle pixel data in that one format. * * WARNING: There are format conversions that will not be supported by this * function. It very much depends on what the Moz2D backends support. If * the temporary B8G8R8A8 DrawTarget that this function creates has a * backend that supports DrawSurface() calls passing a surface with * aSurface's format it will work. Otherwise it will not. * * *** IMPORTANT PERF NOTE *** * * This function exists partly because format conversion is fraught with * non-obvious performance hazards, so we don't want Moz2D consumers to be * doing their own format conversion. Do not try to do so, or at least read * the comments in this functions implemtation. That said, the copy that * this function carries out has a cost and, although this function tries * to avoid perf hazards such as expensive uploads to/readbacks from the * GPU, it can't guarantee that it always successfully does so. Perf * critical code that can directly handle the common formats that it * encounters in a way that is cheaper than a copy-with-format-conversion * should consider doing so, and only use this function as a fallback to * handle other formats. * * XXXjwatt it would be nice if SourceSurface::GetDataSurface took a * SurfaceFormat argument (with a default argument meaning "use the * existing surface's format") and returned a DataSourceSurface in that * format. (There would then be an issue of callers maybe failing to * realize format conversion may involve expensive copying/uploading/ * readback.) */ static mozilla::TemporaryRef CopySurfaceToDataSourceSurfaceWithFormat(SourceSurface* aSurface, SurfaceFormat aFormat); 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; /** * Writes a binary PNG file. * Expensive. Creates a DataSourceSurface, then a DrawTarget, then passes to DrawTarget overloads */ static void WriteAsPNG(mozilla::RefPtr aSourceSurface, const char* aFile); /** * Write as a PNG encoded Data URL to stdout. * Expensive. Creates a DataSourceSurface, then a DrawTarget, then passes to DrawTarget overloads */ static void DumpAsDataURL(mozilla::RefPtr aSourceSurface); /** * Copy a PNG encoded Data URL to the clipboard. * Expensive. Creates a DataSourceSurface, then a DrawTarget, then passes to DrawTarget overloads */ static void CopyAsDataURL(mozilla::RefPtr aSourceSurface); #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