зеркало из https://github.com/mozilla/pjs.git
837 строки
33 KiB
C++
837 строки
33 KiB
C++
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/*
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* Copyright 2006 The Android Open Source Project
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkBitmap_DEFINED
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#define SkBitmap_DEFINED
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#include "Sk64.h"
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#include "SkColor.h"
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#include "SkPoint.h"
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#include "SkRefCnt.h"
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struct SkIRect;
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class SkColorTable;
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class SkPaint;
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class SkPixelRef;
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class SkRegion;
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class SkFlattenableReadBuffer;
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class SkFlattenableWriteBuffer;
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// This is an opaque class, not interpreted by skia
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class SkGpuTexture;
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/** \class SkBitmap
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The SkBitmap class specifies a raster bitmap. A bitmap has an integer width
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and height, and a format (config), and a pointer to the actual pixels.
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Bitmaps can be drawn into a SkCanvas, but they are also used to specify the
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target of a SkCanvas' drawing operations.
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A const SkBitmap exposes getAddr(), which lets a caller write its pixels;
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the constness is considered to apply to the bitmap's configuration, not
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its contents.
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*/
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class SK_API SkBitmap {
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public:
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class Allocator;
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enum Config {
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kNo_Config, //!< bitmap has not been configured
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/**
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* 1-bit per pixel, (0 is transparent, 1 is opaque)
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* Valid as a destination (target of a canvas), but not valid as a src.
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* i.e. you can draw into a 1-bit bitmap, but you cannot draw from one.
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*/
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kA1_Config,
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kA8_Config, //!< 8-bits per pixel, with only alpha specified (0 is transparent, 0xFF is opaque)
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kIndex8_Config, //!< 8-bits per pixel, using SkColorTable to specify the colors
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kRGB_565_Config, //!< 16-bits per pixel, (see SkColorPriv.h for packing)
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kARGB_4444_Config, //!< 16-bits per pixel, (see SkColorPriv.h for packing)
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kARGB_8888_Config, //!< 32-bits per pixel, (see SkColorPriv.h for packing)
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/**
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* Custom compressed format, not supported on all platforms.
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* Cannot be used as a destination (target of a canvas).
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* i.e. you may be able to draw from one, but you cannot draw into one.
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*/
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kRLE_Index8_Config,
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kConfigCount
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};
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/** Default construct creates a bitmap with zero width and height, and no pixels.
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Its config is set to kNo_Config.
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*/
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SkBitmap();
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/** Constructor initializes the new bitmap by copying the src bitmap. All fields are copied,
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but ownership of the pixels remains with the src bitmap.
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*/
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SkBitmap(const SkBitmap& src);
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/** Decrements our (shared) pixel ownership if needed.
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*/
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~SkBitmap();
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/** Copies the src bitmap into this bitmap. Ownership of the src bitmap's pixels remains
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with the src bitmap.
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*/
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SkBitmap& operator=(const SkBitmap& src);
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/** Swap the fields of the two bitmaps. This routine is guaranteed to never fail or throw.
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*/
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// This method is not exported to java.
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void swap(SkBitmap& other);
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/** Return true iff the bitmap has empty dimensions.
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*/
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bool empty() const { return 0 == fWidth || 0 == fHeight; }
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/** Return true iff the bitmap has no pixels nor a pixelref. Note: this can
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return true even if the dimensions of the bitmap are > 0 (see empty()).
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*/
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bool isNull() const { return NULL == fPixels && NULL == fPixelRef; }
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/** Return the config for the bitmap.
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*/
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Config config() const { return (Config)fConfig; }
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/** DEPRECATED, use config()
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*/
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Config getConfig() const { return this->config(); }
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/** Return the bitmap's width, in pixels.
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*/
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int width() const { return fWidth; }
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/** Return the bitmap's height, in pixels.
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*/
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int height() const { return fHeight; }
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/** Return the number of bytes between subsequent rows of the bitmap.
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*/
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int rowBytes() const { return fRowBytes; }
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/** Return the shift amount per pixel (i.e. 0 for 1-byte per pixel, 1 for
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2-bytes per pixel configs, 2 for 4-bytes per pixel configs). Return 0
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for configs that are not at least 1-byte per pixel (e.g. kA1_Config
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or kNo_Config)
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*/
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int shiftPerPixel() const { return fBytesPerPixel >> 1; }
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/** Return the number of bytes per pixel based on the config. If the config
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does not have at least 1 byte per (e.g. kA1_Config) then 0 is returned.
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*/
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int bytesPerPixel() const { return fBytesPerPixel; }
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/** Return the rowbytes expressed as a number of pixels (like width and
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height). Note, for 1-byte per pixel configs like kA8_Config, this will
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return the same as rowBytes(). Is undefined for configs that are less
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than 1-byte per pixel (e.g. kA1_Config)
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*/
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int rowBytesAsPixels() const { return fRowBytes >> (fBytesPerPixel >> 1); }
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/** Return the address of the pixels for this SkBitmap.
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*/
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void* getPixels() const { return fPixels; }
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/** Return the byte size of the pixels, based on the height and rowBytes.
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Note this truncates the result to 32bits. Call getSize64() to detect
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if the real size exceeds 32bits.
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*/
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size_t getSize() const { return fHeight * fRowBytes; }
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/** Return the number of bytes from the pointer returned by getPixels()
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to the end of the allocated space in the buffer. Required in
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cases where extractBitmap has been called.
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*/
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size_t getSafeSize() const ;
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/** Return the byte size of the pixels, based on the height and rowBytes.
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This routine is slightly slower than getSize(), but does not truncate
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the answer to 32bits.
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*/
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Sk64 getSize64() const {
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Sk64 size;
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size.setMul(fHeight, fRowBytes);
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return size;
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}
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/** Same as getSafeSize(), but does not truncate the answer to 32bits.
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*/
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Sk64 getSafeSize64() const ;
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/** Returns true if this bitmap is marked as immutable, meaning that the
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contents of its pixels will not change for the lifetime of the bitmap.
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*/
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bool isImmutable() const;
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/** Marks this bitmap as immutable, meaning that the contents of its
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pixels will not change for the lifetime of the bitmap and of the
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underlying pixelref. This state can be set, but it cannot be
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cleared once it is set. This state propagates to all other bitmaps
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that share the same pixelref.
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*/
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void setImmutable();
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/** Returns true if the bitmap is opaque (has no translucent/transparent pixels).
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*/
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bool isOpaque() const;
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/** Specify if this bitmap's pixels are all opaque or not. Is only meaningful for configs
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that support per-pixel alpha (RGB32, A1, A8).
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*/
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void setIsOpaque(bool);
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/** Returns true if the bitmap is volatile (i.e. should not be cached by devices.)
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*/
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bool isVolatile() const;
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/** Specify whether this bitmap is volatile. Bitmaps are not volatile by
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default. Temporary bitmaps that are discarded after use should be
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marked as volatile. This provides a hint to the device that the bitmap
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should not be cached. Providing this hint when appropriate can
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improve performance by avoiding unnecessary overhead and resource
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consumption on the device.
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*/
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void setIsVolatile(bool);
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/** Reset the bitmap to its initial state (see default constructor). If we are a (shared)
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owner of the pixels, that ownership is decremented.
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*/
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void reset();
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/** Given a config and a width, this computes the optimal rowBytes value. This is called automatically
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if you pass 0 for rowBytes to setConfig().
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*/
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static int ComputeRowBytes(Config c, int width);
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/** Return the bytes-per-pixel for the specified config. If the config is
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not at least 1-byte per pixel, return 0, including for kNo_Config.
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*/
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static int ComputeBytesPerPixel(Config c);
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/** Return the shift-per-pixel for the specified config. If the config is
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not at least 1-byte per pixel, return 0, including for kNo_Config.
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*/
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static int ComputeShiftPerPixel(Config c) {
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return ComputeBytesPerPixel(c) >> 1;
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}
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static Sk64 ComputeSize64(Config, int width, int height);
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static size_t ComputeSize(Config, int width, int height);
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/** Set the bitmap's config and dimensions. If rowBytes is 0, then
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ComputeRowBytes() is called to compute the optimal value. This resets
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any pixel/colortable ownership, just like reset().
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*/
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void setConfig(Config, int width, int height, int rowBytes = 0);
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/** Use this to assign a new pixel address for an existing bitmap. This
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will automatically release any pixelref previously installed. Only call
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this if you are handling ownership/lifetime of the pixel memory.
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If the bitmap retains a reference to the colortable (assuming it is
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not null) it will take care of incrementing the reference count.
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@param pixels Address for the pixels, managed by the caller.
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@param ctable ColorTable (or null) that matches the specified pixels
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*/
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void setPixels(void* p, SkColorTable* ctable = NULL);
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/** Copies the bitmap's pixels to the location pointed at by dst and returns
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true if possible, returns false otherwise.
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In the case when the dstRowBytes matches the bitmap's rowBytes, the copy
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may be made faster by copying over the dst's per-row padding (for all
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rows but the last). By setting preserveDstPad to true the caller can
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disable this optimization and ensure that pixels in the padding are not
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overwritten.
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Always returns false for RLE formats.
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@param dst Location of destination buffer.
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@param dstSize Size of destination buffer. Must be large enough to hold
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pixels using indicated stride.
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@param dstRowBytes Width of each line in the buffer. If -1, uses
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bitmap's internal stride.
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@param preserveDstPad Must we preserve padding in the dst
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*/
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bool copyPixelsTo(void* const dst, size_t dstSize, int dstRowBytes = -1,
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bool preserveDstPad = false)
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const;
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/** Use the standard HeapAllocator to create the pixelref that manages the
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pixel memory. It will be sized based on the current width/height/config.
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If this is called multiple times, a new pixelref object will be created
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each time.
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If the bitmap retains a reference to the colortable (assuming it is
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not null) it will take care of incrementing the reference count.
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@param ctable ColorTable (or null) to use with the pixels that will
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be allocated. Only used if config == Index8_Config
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@return true if the allocation succeeds. If not the pixelref field of
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the bitmap will be unchanged.
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*/
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bool allocPixels(SkColorTable* ctable = NULL) {
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return this->allocPixels(NULL, ctable);
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}
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/** Use the specified Allocator to create the pixelref that manages the
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pixel memory. It will be sized based on the current width/height/config.
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If this is called multiple times, a new pixelref object will be created
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each time.
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If the bitmap retains a reference to the colortable (assuming it is
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not null) it will take care of incrementing the reference count.
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@param allocator The Allocator to use to create a pixelref that can
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manage the pixel memory for the current
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width/height/config. If allocator is NULL, the standard
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HeapAllocator will be used.
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@param ctable ColorTable (or null) to use with the pixels that will
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be allocated. Only used if config == Index8_Config.
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If it is non-null and the config is not Index8, it will
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be ignored.
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@return true if the allocation succeeds. If not the pixelref field of
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the bitmap will be unchanged.
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*/
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bool allocPixels(Allocator* allocator, SkColorTable* ctable);
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/** Return the current pixelref object, if any
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*/
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SkPixelRef* pixelRef() const { return fPixelRef; }
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/** Return the offset into the pixelref, if any. Will return 0 if there is
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no pixelref installed.
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*/
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size_t pixelRefOffset() const { return fPixelRefOffset; }
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/** Assign a pixelref and optional offset. Pixelrefs are reference counted,
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so the existing one (if any) will be unref'd and the new one will be
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ref'd.
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*/
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SkPixelRef* setPixelRef(SkPixelRef* pr, size_t offset = 0);
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/** Call this to ensure that the bitmap points to the current pixel address
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in the pixelref. Balance it with a call to unlockPixels(). These calls
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are harmless if there is no pixelref.
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*/
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void lockPixels() const;
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/** When you are finished access the pixel memory, call this to balance a
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previous call to lockPixels(). This allows pixelrefs that implement
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cached/deferred image decoding to know when there are active clients of
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a given image.
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*/
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void unlockPixels() const;
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/**
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* Some bitmaps can return a copy of their pixels for lockPixels(), but
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* that copy, if modified, will not be pushed back. These bitmaps should
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* not be used as targets for a raster device/canvas (since all pixels
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* modifications will be lost when unlockPixels() is called.)
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*/
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bool lockPixelsAreWritable() const;
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/** Call this to be sure that the bitmap is valid enough to be drawn (i.e.
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it has non-null pixels, and if required by its config, it has a
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non-null colortable. Returns true if all of the above are met.
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*/
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bool readyToDraw() const {
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return this->getPixels() != NULL &&
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((this->config() != kIndex8_Config &&
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this->config() != kRLE_Index8_Config) ||
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fColorTable != NULL);
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}
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/** Returns the pixelRef's texture, or NULL
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*/
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SkGpuTexture* getTexture() const;
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/** Return the bitmap's colortable (if any). Does not affect the colortable's
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reference count.
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*/
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SkColorTable* getColorTable() const { return fColorTable; }
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/** Returns a non-zero, unique value corresponding to the pixels in our
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pixelref (or raw pixels set via setPixels). Each time the pixels are
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changed (and notifyPixelsChanged is called), a different generation ID
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will be returned.
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*/
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uint32_t getGenerationID() const;
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/** Call this if you have changed the contents of the pixels. This will in-
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turn cause a different generation ID value to be returned from
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getGenerationID().
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*/
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void notifyPixelsChanged() const;
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/** Initialize the bitmap's pixels with the specified color+alpha, automatically converting into the correct format
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for the bitmap's config. If the config is kRGB_565_Config, then the alpha value is ignored.
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If the config is kA8_Config, then the r,g,b parameters are ignored.
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*/
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void eraseARGB(U8CPU a, U8CPU r, U8CPU g, U8CPU b) const;
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/** Initialize the bitmap's pixels with the specified color+alpha, automatically converting into the correct format
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for the bitmap's config. If the config is kRGB_565_Config, then the alpha value is presumed
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to be 0xFF. If the config is kA8_Config, then the r,g,b parameters are ignored and the
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pixels are all set to 0xFF.
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*/
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void eraseRGB(U8CPU r, U8CPU g, U8CPU b) const {
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this->eraseARGB(0xFF, r, g, b);
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}
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/** Initialize the bitmap's pixels with the specified color, automatically converting into the correct format
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for the bitmap's config. If the config is kRGB_565_Config, then the color's alpha value is presumed
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to be 0xFF. If the config is kA8_Config, then only the color's alpha value is used.
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*/
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void eraseColor(SkColor c) const {
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this->eraseARGB(SkColorGetA(c), SkColorGetR(c), SkColorGetG(c),
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SkColorGetB(c));
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}
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/** Scroll (a subset of) the contents of this bitmap by dx/dy. If there are
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no pixels allocated (i.e. getPixels() returns null) the method will
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still update the inval region (if present).
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@param subset The subset of the bitmap to scroll/move. To scroll the
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entire contents, specify [0, 0, width, height] or just
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pass null.
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@param dx The amount to scroll in X
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@param dy The amount to scroll in Y
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@param inval Optional (may be null). Returns the area of the bitmap that
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was scrolled away. E.g. if dx = dy = 0, then inval would
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be set to empty. If dx >= width or dy >= height, then
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inval would be set to the entire bounds of the bitmap.
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@return true if the scroll was doable. Will return false if the bitmap
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uses an unsupported config for scrolling (only kA8,
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kIndex8, kRGB_565, kARGB_4444, kARGB_8888 are supported).
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If no pixels are present (i.e. getPixels() returns false)
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inval will still be updated, and true will be returned.
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*/
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bool scrollRect(const SkIRect* subset, int dx, int dy,
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SkRegion* inval = NULL) const;
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/**
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* Return the SkColor of the specified pixel. In most cases this will
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* require un-premultiplying the color. Alpha only configs (A1 and A8)
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* return black with the appropriate alpha set. The value is undefined
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* for kNone_Config or if x or y are out of bounds, or if the bitmap
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* does not have any pixels (or has not be locked with lockPixels()).
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*/
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SkColor getColor(int x, int y) const;
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/** Returns the address of the specified pixel. This performs a runtime
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check to know the size of the pixels, and will return the same answer
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as the corresponding size-specific method (e.g. getAddr16). Since the
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check happens at runtime, it is much slower than using a size-specific
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version. Unlike the size-specific methods, this routine also checks if
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getPixels() returns null, and returns that. The size-specific routines
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perform a debugging assert that getPixels() is not null, but they do
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not do any runtime checks.
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*/
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void* getAddr(int x, int y) const;
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/** Returns the address of the pixel specified by x,y for 32bit pixels.
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* In debug build, this asserts that the pixels are allocated and locked,
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* and that the config is 32-bit, however none of these checks are performed
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* in the release build.
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*/
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inline uint32_t* getAddr32(int x, int y) const;
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/** Returns the address of the pixel specified by x,y for 16bit pixels.
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* In debug build, this asserts that the pixels are allocated and locked,
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* and that the config is 16-bit, however none of these checks are performed
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* in the release build.
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*/
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inline uint16_t* getAddr16(int x, int y) const;
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/** Returns the address of the pixel specified by x,y for 8bit pixels.
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* In debug build, this asserts that the pixels are allocated and locked,
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* and that the config is 8-bit, however none of these checks are performed
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* in the release build.
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*/
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inline uint8_t* getAddr8(int x, int y) const;
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/** Returns the address of the byte containing the pixel specified by x,y
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* for 1bit pixels.
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* In debug build, this asserts that the pixels are allocated and locked,
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* and that the config is 1-bit, however none of these checks are performed
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* in the release build.
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*/
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inline uint8_t* getAddr1(int x, int y) const;
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/** Returns the color corresponding to the pixel specified by x,y for
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* colortable based bitmaps.
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* In debug build, this asserts that the pixels are allocated and locked,
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* that the config is kIndex8, and that the colortable is allocated,
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* however none of these checks are performed in the release build.
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*/
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inline SkPMColor getIndex8Color(int x, int y) const;
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/** Set dst to be a setset of this bitmap. If possible, it will share the
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pixel memory, and just point into a subset of it. However, if the config
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does not support this, a local copy will be made and associated with
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the dst bitmap. If the subset rectangle, intersected with the bitmap's
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dimensions is empty, or if there is an unsupported config, false will be
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returned and dst will be untouched.
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@param dst The bitmap that will be set to a subset of this bitmap
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|
@param subset The rectangle of pixels in this bitmap that dst will
|
|
reference.
|
|
@return true if the subset copy was successfully made.
|
|
*/
|
|
bool extractSubset(SkBitmap* dst, const SkIRect& subset) const;
|
|
|
|
/** Makes a deep copy of this bitmap, respecting the requested config,
|
|
* and allocating the dst pixels on the cpu.
|
|
* Returns false if either there is an error (i.e. the src does not have
|
|
* pixels) or the request cannot be satisfied (e.g. the src has per-pixel
|
|
* alpha, and the requested config does not support alpha).
|
|
* @param dst The bitmap to be sized and allocated
|
|
* @param c The desired config for dst
|
|
* @param allocator Allocator used to allocate the pixelref for the dst
|
|
* bitmap. If this is null, the standard HeapAllocator
|
|
* will be used.
|
|
* @return true if the copy could be made.
|
|
*/
|
|
bool copyTo(SkBitmap* dst, Config c, Allocator* allocator = NULL) const;
|
|
|
|
/** Makes a deep copy of this bitmap, respecting the requested config, and
|
|
* with custom allocation logic that will keep the copied pixels
|
|
* in the same domain as the source: If the src pixels are allocated for
|
|
* the cpu, then so will the dst. If the src pixels are allocated on the
|
|
* gpu (typically as a texture), the it will do the same for the dst.
|
|
* If the request cannot be fulfilled, returns false and dst is unmodified.
|
|
*/
|
|
bool deepCopyTo(SkBitmap* dst, Config c) const;
|
|
|
|
/** Returns true if this bitmap can be deep copied into the requested config
|
|
by calling copyTo().
|
|
*/
|
|
bool canCopyTo(Config newConfig) const;
|
|
|
|
bool hasMipMap() const;
|
|
void buildMipMap(bool forceRebuild = false);
|
|
void freeMipMap();
|
|
|
|
/** Given scale factors sx, sy, determine the miplevel available in the
|
|
bitmap, and return it (this is the amount to shift matrix iterators
|
|
by). If dst is not null, it is set to the correct level.
|
|
*/
|
|
int extractMipLevel(SkBitmap* dst, SkFixed sx, SkFixed sy);
|
|
|
|
bool extractAlpha(SkBitmap* dst) const {
|
|
return this->extractAlpha(dst, NULL, NULL, NULL);
|
|
}
|
|
|
|
bool extractAlpha(SkBitmap* dst, const SkPaint* paint,
|
|
SkIPoint* offset) const {
|
|
return this->extractAlpha(dst, paint, NULL, offset);
|
|
}
|
|
|
|
/** Set dst to contain alpha layer of this bitmap. If destination bitmap
|
|
fails to be initialized, e.g. because allocator can't allocate pixels
|
|
for it, dst will not be modified and false will be returned.
|
|
|
|
@param dst The bitmap to be filled with alpha layer
|
|
@param paint The paint to draw with
|
|
@param allocator Allocator used to allocate the pixelref for the dst
|
|
bitmap. If this is null, the standard HeapAllocator
|
|
will be used.
|
|
@param offset If not null, it is set to top-left coordinate to position
|
|
the returned bitmap so that it visually lines up with the
|
|
original
|
|
*/
|
|
bool extractAlpha(SkBitmap* dst, const SkPaint* paint, Allocator* allocator,
|
|
SkIPoint* offset) const;
|
|
|
|
void flatten(SkFlattenableWriteBuffer&) const;
|
|
void unflatten(SkFlattenableReadBuffer&);
|
|
|
|
SkDEBUGCODE(void validate() const;)
|
|
|
|
class Allocator : public SkRefCnt {
|
|
public:
|
|
/** Allocate the pixel memory for the bitmap, given its dimensions and
|
|
config. Return true on success, where success means either setPixels
|
|
or setPixelRef was called. The pixels need not be locked when this
|
|
returns. If the config requires a colortable, it also must be
|
|
installed via setColorTable. If false is returned, the bitmap and
|
|
colortable should be left unchanged.
|
|
*/
|
|
virtual bool allocPixelRef(SkBitmap*, SkColorTable*) = 0;
|
|
};
|
|
|
|
/** Subclass of Allocator that returns a pixelref that allocates its pixel
|
|
memory from the heap. This is the default Allocator invoked by
|
|
allocPixels().
|
|
*/
|
|
class HeapAllocator : public Allocator {
|
|
public:
|
|
virtual bool allocPixelRef(SkBitmap*, SkColorTable*);
|
|
};
|
|
|
|
class RLEPixels {
|
|
public:
|
|
RLEPixels(int width, int height);
|
|
virtual ~RLEPixels();
|
|
|
|
uint8_t* packedAtY(int y) const {
|
|
SkASSERT((unsigned)y < (unsigned)fHeight);
|
|
return fYPtrs[y];
|
|
}
|
|
|
|
// called by subclasses during creation
|
|
void setPackedAtY(int y, uint8_t* addr) {
|
|
SkASSERT((unsigned)y < (unsigned)fHeight);
|
|
fYPtrs[y] = addr;
|
|
}
|
|
|
|
private:
|
|
uint8_t** fYPtrs;
|
|
int fHeight;
|
|
};
|
|
|
|
private:
|
|
struct MipMap;
|
|
mutable MipMap* fMipMap;
|
|
|
|
mutable SkPixelRef* fPixelRef;
|
|
mutable size_t fPixelRefOffset;
|
|
mutable int fPixelLockCount;
|
|
// either user-specified (in which case it is not treated as mutable)
|
|
// or a cache of the returned value from fPixelRef->lockPixels()
|
|
mutable void* fPixels;
|
|
mutable SkColorTable* fColorTable; // only meaningful for kIndex8
|
|
// When there is no pixel ref (setPixels was called) we still need a
|
|
// gen id for SkDevice implementations that may cache a copy of the
|
|
// pixels (e.g. as a gpu texture)
|
|
mutable int fRawPixelGenerationID;
|
|
|
|
enum Flags {
|
|
kImageIsOpaque_Flag = 0x01,
|
|
kImageIsVolatile_Flag = 0x02,
|
|
kImageIsImmutable_Flag = 0x04
|
|
};
|
|
|
|
uint32_t fRowBytes;
|
|
uint32_t fWidth;
|
|
uint32_t fHeight;
|
|
uint8_t fConfig;
|
|
uint8_t fFlags;
|
|
uint8_t fBytesPerPixel; // based on config
|
|
|
|
/* Internal computations for safe size.
|
|
*/
|
|
static Sk64 ComputeSafeSize64(Config config,
|
|
uint32_t width,
|
|
uint32_t height,
|
|
uint32_t rowBytes);
|
|
static size_t ComputeSafeSize(Config config,
|
|
uint32_t width,
|
|
uint32_t height,
|
|
uint32_t rowBytes);
|
|
|
|
/* Unreference any pixelrefs or colortables
|
|
*/
|
|
void freePixels();
|
|
void updatePixelsFromRef() const;
|
|
|
|
static SkFixed ComputeMipLevel(SkFixed sx, SkFixed dy);
|
|
};
|
|
|
|
/** \class SkColorTable
|
|
|
|
SkColorTable holds an array SkPMColors (premultiplied 32-bit colors) used by
|
|
8-bit bitmaps, where the bitmap bytes are interpreted as indices into the colortable.
|
|
*/
|
|
class SkColorTable : public SkRefCnt {
|
|
public:
|
|
/** Makes a deep copy of colors.
|
|
*/
|
|
SkColorTable(const SkColorTable& src);
|
|
/** Preallocates the colortable to have 'count' colors, which
|
|
* are initially set to 0.
|
|
*/
|
|
explicit SkColorTable(int count);
|
|
explicit SkColorTable(SkFlattenableReadBuffer&);
|
|
SkColorTable(const SkPMColor colors[], int count);
|
|
virtual ~SkColorTable();
|
|
|
|
enum Flags {
|
|
kColorsAreOpaque_Flag = 0x01 //!< if set, all of the colors in the table are opaque (alpha==0xFF)
|
|
};
|
|
/** Returns the flag bits for the color table. These can be changed with setFlags().
|
|
*/
|
|
unsigned getFlags() const { return fFlags; }
|
|
/** Set the flags for the color table. See the Flags enum for possible values.
|
|
*/
|
|
void setFlags(unsigned flags);
|
|
|
|
bool isOpaque() const { return (fFlags & kColorsAreOpaque_Flag) != 0; }
|
|
void setIsOpaque(bool isOpaque);
|
|
|
|
/** Returns the number of colors in the table.
|
|
*/
|
|
int count() const { return fCount; }
|
|
|
|
/** Returns the specified color from the table. In the debug build, this asserts that
|
|
the index is in range (0 <= index < count).
|
|
*/
|
|
SkPMColor operator[](int index) const {
|
|
SkASSERT(fColors != NULL && (unsigned)index < fCount);
|
|
return fColors[index];
|
|
}
|
|
|
|
/** Specify the number of colors in the color table. This does not initialize the colors
|
|
to any value, just allocates memory for them. To initialize the values, either call
|
|
setColors(array, count), or follow setCount(count) with a call to
|
|
lockColors()/{set the values}/unlockColors(true).
|
|
*/
|
|
// void setColors(int count) { this->setColors(NULL, count); }
|
|
// void setColors(const SkPMColor[], int count);
|
|
|
|
/** Return the array of colors for reading and/or writing. This must be
|
|
balanced by a call to unlockColors(changed?), telling the colortable if
|
|
the colors were changed during the lock.
|
|
*/
|
|
SkPMColor* lockColors() {
|
|
SkDEBUGCODE(fColorLockCount += 1;)
|
|
return fColors;
|
|
}
|
|
/** Balancing call to lockColors(). If the colors have been changed, pass true.
|
|
*/
|
|
void unlockColors(bool changed);
|
|
|
|
/** Similar to lockColors(), lock16BitCache() returns the array of
|
|
RGB16 colors that mirror the 32bit colors. However, this function
|
|
will return null if kColorsAreOpaque_Flag is not set.
|
|
Also, unlike lockColors(), the returned array here cannot be modified.
|
|
*/
|
|
const uint16_t* lock16BitCache();
|
|
/** Balancing call to lock16BitCache().
|
|
*/
|
|
void unlock16BitCache() {
|
|
SkASSERT(f16BitCacheLockCount > 0);
|
|
SkDEBUGCODE(f16BitCacheLockCount -= 1);
|
|
}
|
|
|
|
void flatten(SkFlattenableWriteBuffer&) const;
|
|
|
|
private:
|
|
SkPMColor* fColors;
|
|
uint16_t* f16BitCache;
|
|
uint16_t fCount;
|
|
uint8_t fFlags;
|
|
SkDEBUGCODE(int fColorLockCount;)
|
|
SkDEBUGCODE(int f16BitCacheLockCount;)
|
|
|
|
void inval16BitCache();
|
|
};
|
|
|
|
class SkAutoLockPixels : public SkNoncopyable {
|
|
public:
|
|
SkAutoLockPixels(const SkBitmap& bm, bool doLock = true) : fBitmap(bm) {
|
|
fDidLock = doLock;
|
|
if (doLock) {
|
|
bm.lockPixels();
|
|
}
|
|
}
|
|
~SkAutoLockPixels() {
|
|
if (fDidLock) {
|
|
fBitmap.unlockPixels();
|
|
}
|
|
}
|
|
|
|
private:
|
|
const SkBitmap& fBitmap;
|
|
bool fDidLock;
|
|
};
|
|
|
|
/** Helper class that performs the lock/unlockColors calls on a colortable.
|
|
The destructor will call unlockColors(false) if it has a bitmap's colortable
|
|
*/
|
|
class SkAutoLockColors : public SkNoncopyable {
|
|
public:
|
|
/** Initialize with no bitmap. Call lockColors(bitmap) to lock bitmap's
|
|
colortable
|
|
*/
|
|
SkAutoLockColors() : fCTable(NULL), fColors(NULL) {}
|
|
/** Initialize with bitmap, locking its colortable if present
|
|
*/
|
|
explicit SkAutoLockColors(const SkBitmap& bm) {
|
|
fCTable = bm.getColorTable();
|
|
fColors = fCTable ? fCTable->lockColors() : NULL;
|
|
}
|
|
/** Initialize with a colortable (may be null)
|
|
*/
|
|
explicit SkAutoLockColors(SkColorTable* ctable) {
|
|
fCTable = ctable;
|
|
fColors = ctable ? ctable->lockColors() : NULL;
|
|
}
|
|
~SkAutoLockColors() {
|
|
if (fCTable) {
|
|
fCTable->unlockColors(false);
|
|
}
|
|
}
|
|
|
|
/** Return the currently locked colors, or NULL if no bitmap's colortable
|
|
is currently locked.
|
|
*/
|
|
const SkPMColor* colors() const { return fColors; }
|
|
|
|
/** Locks the table and returns is colors (assuming ctable is not null) and
|
|
unlocks the previous table if one was present
|
|
*/
|
|
const SkPMColor* lockColors(SkColorTable* ctable) {
|
|
if (fCTable) {
|
|
fCTable->unlockColors(false);
|
|
}
|
|
fCTable = ctable;
|
|
fColors = ctable ? ctable->lockColors() : NULL;
|
|
return fColors;
|
|
}
|
|
|
|
const SkPMColor* lockColors(const SkBitmap& bm) {
|
|
return this->lockColors(bm.getColorTable());
|
|
}
|
|
|
|
private:
|
|
SkColorTable* fCTable;
|
|
const SkPMColor* fColors;
|
|
};
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
inline uint32_t* SkBitmap::getAddr32(int x, int y) const {
|
|
SkASSERT(fPixels);
|
|
SkASSERT(fConfig == kARGB_8888_Config);
|
|
SkASSERT((unsigned)x < fWidth && (unsigned)y < fHeight);
|
|
return (uint32_t*)((char*)fPixels + y * fRowBytes + (x << 2));
|
|
}
|
|
|
|
inline uint16_t* SkBitmap::getAddr16(int x, int y) const {
|
|
SkASSERT(fPixels);
|
|
SkASSERT(fConfig == kRGB_565_Config || fConfig == kARGB_4444_Config);
|
|
SkASSERT((unsigned)x < fWidth && (unsigned)y < fHeight);
|
|
return (uint16_t*)((char*)fPixels + y * fRowBytes + (x << 1));
|
|
}
|
|
|
|
inline uint8_t* SkBitmap::getAddr8(int x, int y) const {
|
|
SkASSERT(fPixels);
|
|
SkASSERT(fConfig == kA8_Config || fConfig == kIndex8_Config);
|
|
SkASSERT((unsigned)x < fWidth && (unsigned)y < fHeight);
|
|
return (uint8_t*)fPixels + y * fRowBytes + x;
|
|
}
|
|
|
|
inline SkPMColor SkBitmap::getIndex8Color(int x, int y) const {
|
|
SkASSERT(fPixels);
|
|
SkASSERT(fConfig == kIndex8_Config);
|
|
SkASSERT((unsigned)x < fWidth && (unsigned)y < fHeight);
|
|
SkASSERT(fColorTable);
|
|
return (*fColorTable)[*((const uint8_t*)fPixels + y * fRowBytes + x)];
|
|
}
|
|
|
|
// returns the address of the byte that contains the x coordinate
|
|
inline uint8_t* SkBitmap::getAddr1(int x, int y) const {
|
|
SkASSERT(fPixels);
|
|
SkASSERT(fConfig == kA1_Config);
|
|
SkASSERT((unsigned)x < fWidth && (unsigned)y < fHeight);
|
|
return (uint8_t*)fPixels + y * fRowBytes + (x >> 3);
|
|
}
|
|
|
|
#endif
|