326 lines
13 KiB
C++
326 lines
13 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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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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#ifndef GFX_UTILS_H
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#define GFX_UTILS_H
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#include "gfxTypes.h"
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#include "ImageTypes.h"
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#include "imgIContainer.h"
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#include "mozilla/gfx/2D.h"
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#include "mozilla/RefPtr.h"
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#include "mozilla/UniquePtr.h"
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#include "nsColor.h"
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#include "nsPrintfCString.h"
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#include "nsRegionFwd.h"
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#include "mozilla/gfx/Rect.h"
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#include "mozilla/CheckedInt.h"
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class gfxASurface;
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class gfxDrawable;
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class nsIInputStream;
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class nsIGfxInfo;
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class nsIPresShell;
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namespace mozilla {
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namespace layers {
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struct PlanarYCbCrData;
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} // namespace layers
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namespace image {
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class ImageRegion;
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} // namespace image
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} // namespace mozilla
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class gfxUtils {
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public:
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typedef mozilla::gfx::DataSourceSurface DataSourceSurface;
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typedef mozilla::gfx::DrawTarget DrawTarget;
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typedef mozilla::gfx::IntPoint IntPoint;
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typedef mozilla::gfx::Matrix Matrix;
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typedef mozilla::gfx::SourceSurface SourceSurface;
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typedef mozilla::gfx::SurfaceFormat SurfaceFormat;
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typedef mozilla::image::ImageRegion ImageRegion;
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typedef mozilla::YUVColorSpace YUVColorSpace;
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/*
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* Premultiply or Unpremultiply aSourceSurface, writing the result
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* to aDestSurface or back into aSourceSurface if aDestSurface is null.
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*
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* If aDestSurface is given, it must have identical format, dimensions, and
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* stride as the source.
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*
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* If the source is not SurfaceFormat::A8R8G8B8_UINT32, no operation is performed. If
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* aDestSurface is given, the data is copied over.
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*/
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static bool PremultiplyDataSurface(DataSourceSurface* srcSurf,
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DataSourceSurface* destSurf);
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static bool UnpremultiplyDataSurface(DataSourceSurface* srcSurf,
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DataSourceSurface* destSurf);
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static already_AddRefed<DataSourceSurface>
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CreatePremultipliedDataSurface(DataSourceSurface* srcSurf);
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static already_AddRefed<DataSourceSurface>
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CreateUnpremultipliedDataSurface(DataSourceSurface* srcSurf);
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static void ConvertBGRAtoRGBA(uint8_t* aData, uint32_t aLength);
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/**
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* Draw something drawable while working around limitations like bad support
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* for EXTEND_PAD, lack of source-clipping, or cairo / pixman bugs with
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* extreme user-space-to-image-space transforms.
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*
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* The input parameters here usually come from the output of our image
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* snapping algorithm in nsLayoutUtils.cpp.
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* This method is split from nsLayoutUtils::DrawPixelSnapped to allow for
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* adjusting the parameters. For example, certain images with transparent
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* margins only have a drawable subimage. For those images, imgFrame::Draw
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* will tweak the rects and transforms that it gets from the pixel snapping
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* algorithm before passing them on to this method.
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*/
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static void DrawPixelSnapped(gfxContext* aContext,
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gfxDrawable* aDrawable,
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const gfxSize& aImageSize,
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const ImageRegion& aRegion,
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const mozilla::gfx::SurfaceFormat aFormat,
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mozilla::gfx::SamplingFilter aSamplingFilter,
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uint32_t aImageFlags = imgIContainer::FLAG_NONE,
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gfxFloat aOpacity = 1.0);
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/**
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* Clip aContext to the region aRegion.
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*/
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static void ClipToRegion(gfxContext* aContext, const nsIntRegion& aRegion);
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/**
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* Clip aTarget to the region aRegion.
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*/
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static void ClipToRegion(mozilla::gfx::DrawTarget* aTarget, const nsIntRegion& aRegion);
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/*
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* Convert image format to depth value
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*/
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static int ImageFormatToDepth(gfxImageFormat aFormat);
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/**
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* Return the transform matrix that maps aFrom to the rectangle defined by
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* aToTopLeft/aToTopRight/aToBottomRight. aFrom must be
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* nonempty and the destination rectangle must be axis-aligned.
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*/
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static gfxMatrix TransformRectToRect(const gfxRect& aFrom,
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const gfxPoint& aToTopLeft,
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const gfxPoint& aToTopRight,
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const gfxPoint& aToBottomRight);
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static Matrix TransformRectToRect(const gfxRect& aFrom,
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const IntPoint& aToTopLeft,
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const IntPoint& aToTopRight,
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const IntPoint& aToBottomRight);
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/**
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* If aIn can be represented exactly using an gfx::IntRect (i.e.
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* integer-aligned edges and coordinates in the int32_t range) then we
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* set aOut to that rectangle, otherwise return failure.
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*/
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static bool GfxRectToIntRect(const gfxRect& aIn, mozilla::gfx::IntRect* aOut);
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/**
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* Return the smallest power of kScaleResolution (2) greater than or equal to
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* aVal.
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*/
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static gfxFloat ClampToScaleFactor(gfxFloat aVal);
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/**
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* Clears surface to aColor (which defaults to transparent black).
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*/
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static void ClearThebesSurface(gfxASurface* aSurface);
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/**
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* Get array of yuv to rgb conversion matrix.
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*/
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static float* Get4x3YuvColorMatrix(YUVColorSpace aYUVColorSpace);
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static float* Get3x3YuvColorMatrix(YUVColorSpace aYUVColorSpace);
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/**
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* Creates a copy of aSurface, but having the SurfaceFormat aFormat.
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*
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* This function always creates a new surface. Do not call it if aSurface's
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* format is the same as aFormat. Such a non-conversion would just be an
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* unnecessary and wasteful copy (this function asserts to prevent that).
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*
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* This function is intended to be called by code that needs to access the
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* pixel data of the surface, but doesn't want to have lots of branches
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* to handle different pixel data formats (code which would become out of
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* date if and when new formats are added). Callers can use this function
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* to copy the surface to a specified format so that they only have to
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* handle pixel data in that one format.
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*
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* WARNING: There are format conversions that will not be supported by this
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* function. It very much depends on what the Moz2D backends support. If
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* the temporary B8G8R8A8 DrawTarget that this function creates has a
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* backend that supports DrawSurface() calls passing a surface with
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* aSurface's format it will work. Otherwise it will not.
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*
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* *** IMPORTANT PERF NOTE ***
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*
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* This function exists partly because format conversion is fraught with
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* non-obvious performance hazards, so we don't want Moz2D consumers to be
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* doing their own format conversion. Do not try to do so, or at least read
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* the comments in this functions implemtation. That said, the copy that
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* this function carries out has a cost and, although this function tries
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* to avoid perf hazards such as expensive uploads to/readbacks from the
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* GPU, it can't guarantee that it always successfully does so. Perf
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* critical code that can directly handle the common formats that it
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* encounters in a way that is cheaper than a copy-with-format-conversion
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* should consider doing so, and only use this function as a fallback to
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* handle other formats.
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*
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* XXXjwatt it would be nice if SourceSurface::GetDataSurface took a
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* SurfaceFormat argument (with a default argument meaning "use the
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* existing surface's format") and returned a DataSourceSurface in that
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* format. (There would then be an issue of callers maybe failing to
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* realize format conversion may involve expensive copying/uploading/
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* readback.)
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*/
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static already_AddRefed<DataSourceSurface>
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CopySurfaceToDataSourceSurfaceWithFormat(SourceSurface* aSurface,
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SurfaceFormat aFormat);
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static const uint8_t sUnpremultiplyTable[256*256];
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static const uint8_t sPremultiplyTable[256*256];
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/**
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* Return a color that can be used to identify a frame with a given frame number.
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* The colors will cycle after sNumFrameColors. You can query colors 0 .. sNumFrameColors-1
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* to get all the colors back.
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*/
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static const mozilla::gfx::Color& GetColorForFrameNumber(uint64_t aFrameNumber);
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static const uint32_t sNumFrameColors;
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enum BinaryOrData {
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eBinaryEncode,
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eDataURIEncode
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};
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/**
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* Encodes the given surface to PNG/JPEG/BMP/etc. using imgIEncoder.
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*
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* @param aMimeType The MIME-type of the image type that the surface is to
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* be encoded to. Used to create an appropriate imgIEncoder instance to
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* do the encoding.
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*
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* @param aOutputOptions Passed directly to imgIEncoder::InitFromData as
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* the value of the |outputOptions| parameter. Callers are responsible
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* for making sure that this is a sane value for the passed MIME-type
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* (i.e. for the type of encoder that will be created).
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*
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* @aBinaryOrData Flag used to determine if the surface is simply encoded
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* to the requested binary image format, or if the binary image is
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* further converted to base-64 and written out as a 'data:' URI.
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*
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* @aFile If specified, the encoded data is written out to aFile, otherwise
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* it is copied to the clipboard.
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*
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* TODO: Copying to the clipboard as a binary file is not currently
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* supported.
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*/
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static nsresult
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EncodeSourceSurface(SourceSurface* aSurface,
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const nsACString& aMimeType,
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const nsAString& aOutputOptions,
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BinaryOrData aBinaryOrData,
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FILE* aFile);
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/**
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* Write as a PNG file to the path aFile.
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*/
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static void WriteAsPNG(SourceSurface* aSurface, const nsAString& aFile);
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static void WriteAsPNG(SourceSurface* aSurface, const char* aFile);
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static void WriteAsPNG(DrawTarget* aDT, const nsAString& aFile);
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static void WriteAsPNG(DrawTarget* aDT, const char* aFile);
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static void WriteAsPNG(nsIPresShell* aShell, const char* aFile);
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/**
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* Dump as a PNG encoded Data URL to a FILE stream (using stdout by
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* default).
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*
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* Rather than giving aFile a default argument we have separate functions
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* to make them easier to use from a debugger.
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*/
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static void DumpAsDataURI(SourceSurface* aSourceSurface, FILE* aFile);
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static inline void DumpAsDataURI(SourceSurface* aSourceSurface) {
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DumpAsDataURI(aSourceSurface, stdout);
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}
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static void DumpAsDataURI(DrawTarget* aDT, FILE* aFile);
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static inline void DumpAsDataURI(DrawTarget* aDT) {
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DumpAsDataURI(aDT, stdout);
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}
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static nsCString GetAsDataURI(SourceSurface* aSourceSurface);
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static nsCString GetAsDataURI(DrawTarget* aDT);
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static nsCString GetAsLZ4Base64Str(DataSourceSurface* aSourceSurface);
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static mozilla::UniquePtr<uint8_t[]> GetImageBuffer(DataSourceSurface* aSurface,
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bool aIsAlphaPremultiplied,
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int32_t* outFormat);
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static nsresult GetInputStream(DataSourceSurface* aSurface,
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bool aIsAlphaPremultiplied,
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const char* aMimeType,
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const char16_t* aEncoderOptions,
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nsIInputStream** outStream);
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static nsresult ThreadSafeGetFeatureStatus(const nsCOMPtr<nsIGfxInfo>& gfxInfo,
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int32_t feature,
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nsACString& failureId,
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int32_t* status);
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// Can pass `nullptr` for gfxInfo.
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// If FAILED(ThreadSafeGetFeatureStatus), out_blacklistId will be empty.
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static bool IsFeatureBlacklisted(nsCOMPtr<nsIGfxInfo> gfxInfo, int32_t feature,
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nsACString* const out_blacklistId);
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/**
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* Copy to the clipboard as a PNG encoded Data URL.
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*/
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static void CopyAsDataURI(SourceSurface* aSourceSurface);
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static void CopyAsDataURI(DrawTarget* aDT);
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static bool DumpDisplayList();
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static FILE* sDumpPaintFile;
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};
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namespace mozilla {
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namespace gfx {
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/**
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* If the CMS mode is eCMSMode_All, these functions transform the passed
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* color to a device color using the transform returened by gfxPlatform::
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* GetCMSRGBTransform(). If the CMS mode is some other value, the color is
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* returned unchanged (other than a type change to Moz2D Color, if
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* applicable).
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*/
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Color ToDeviceColor(Color aColor);
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Color ToDeviceColor(nscolor aColor);
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/**
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* Performs a checked multiply of the given width, height, and bytes-per-pixel
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* values.
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*/
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static inline CheckedInt<uint32_t>
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SafeBytesForBitmap(uint32_t aWidth, uint32_t aHeight, unsigned aBytesPerPixel)
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{
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MOZ_ASSERT(aBytesPerPixel > 0);
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CheckedInt<uint32_t> width = uint32_t(aWidth);
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CheckedInt<uint32_t> height = uint32_t(aHeight);
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return width * height * aBytesPerPixel;
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}
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} // namespace gfx
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} // namespace mozilla
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#endif
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