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      1 
      2 /*
      3  * Copyright 2011 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 
      9 
     10 #include "SkCanvas.h"
     11 #include "SkColorPriv.h"
     12 
     13 /**
     14  * Converts pixels from one Config8888 to another Config8888
     15  */
     16 void SkConvertConfig8888Pixels(uint32_t* dstPixels,
     17                                size_t dstRowBytes,
     18                                SkCanvas::Config8888 dstConfig,
     19                                const uint32_t* srcPixels,
     20                                size_t srcRowBytes,
     21                                SkCanvas::Config8888 srcConfig,
     22                                int width,
     23                                int height);
     24 
     25 /**
     26  * Packs a, r, g, b, values into byte order specified by config.
     27  */
     28 uint32_t SkPackConfig8888(SkCanvas::Config8888 config,
     29                           uint32_t a,
     30                           uint32_t r,
     31                           uint32_t g,
     32                           uint32_t b);
     33 
     34 namespace {
     35 
     36 /**
     37   Copies all pixels from a bitmap to a dst ptr with a given rowBytes and
     38   Config8888. The bitmap must have kARGB_8888_Config.
     39  */
     40 inline void SkCopyBitmapToConfig8888(uint32_t* dstPixels,
     41                                      size_t dstRowBytes,
     42                                      SkCanvas::Config8888 dstConfig8888,
     43                                      const SkBitmap& srcBmp);
     44 
     45 /**
     46   Copies over all pixels in a bitmap from a src ptr with a given rowBytes and
     47   Config8888. The bitmap must have pixels and be kARGB_8888_Config.
     48  */
     49 inline void SkCopyConfig8888ToBitmap(const SkBitmap& dstBmp,
     50                                      const uint32_t* srcPixels,
     51                                      size_t srcRowBytes,
     52                                      SkCanvas::Config8888 srcConfig8888);
     53 
     54 }
     55 
     56 ///////////////////////////////////////////////////////////////////////////////
     57 // Implementation
     58 
     59 namespace {
     60 
     61 inline void SkCopyBitmapToConfig8888(uint32_t* dstPixels,
     62                                      size_t dstRowBytes,
     63                                      SkCanvas::Config8888 dstConfig8888,
     64                                      const SkBitmap& srcBmp) {
     65     SkASSERT(SkBitmap::kARGB_8888_Config == srcBmp.config());
     66     SkAutoLockPixels alp(srcBmp);
     67     int w = srcBmp.width();
     68     int h = srcBmp.height();
     69     size_t srcRowBytes = srcBmp.rowBytes();
     70     const uint32_t* srcPixels = reinterpret_cast<uint32_t*>(srcBmp.getPixels());
     71 
     72     SkConvertConfig8888Pixels(dstPixels, dstRowBytes, dstConfig8888, srcPixels, srcRowBytes, SkCanvas::kNative_Premul_Config8888, w, h);
     73 }
     74 
     75 inline void SkCopyConfig8888ToBitmap(const SkBitmap& dstBmp,
     76                                      const uint32_t* srcPixels,
     77                                      size_t srcRowBytes,
     78                                      SkCanvas::Config8888 srcConfig8888) {
     79     SkASSERT(SkBitmap::kARGB_8888_Config == dstBmp.config());
     80     SkAutoLockPixels alp(dstBmp);
     81     int w = dstBmp.width();
     82     int h = dstBmp.height();
     83     size_t dstRowBytes = dstBmp.rowBytes();
     84     uint32_t* dstPixels = reinterpret_cast<uint32_t*>(dstBmp.getPixels());
     85 
     86     SkConvertConfig8888Pixels(dstPixels, dstRowBytes, SkCanvas::kNative_Premul_Config8888, srcPixels, srcRowBytes, srcConfig8888, w, h);
     87 }
     88 
     89 }
     90