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      1 /*
      2  * Copyright 2011 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "SkBitmapDevice.h"
      9 #include "SkCanvas.h"
     10 #include "SkConfig8888.h"
     11 #include "Test.h"
     12 #include "sk_tool_utils.h"
     13 
     14 #if SK_SUPPORT_GPU
     15 #include "GrContextFactory.h"
     16 #include "SkGpuDevice.h"
     17 #endif
     18 
     19 static uint32_t pack_unpremul_rgba(SkColor c) {
     20     uint32_t packed;
     21     uint8_t* byte = reinterpret_cast<uint8_t*>(&packed);
     22     byte[0] = SkColorGetR(c);
     23     byte[1] = SkColorGetG(c);
     24     byte[2] = SkColorGetB(c);
     25     byte[3] = SkColorGetA(c);
     26     return packed;
     27 }
     28 
     29 static uint32_t pack_unpremul_bgra(SkColor c) {
     30     uint32_t packed;
     31     uint8_t* byte = reinterpret_cast<uint8_t*>(&packed);
     32     byte[0] = SkColorGetB(c);
     33     byte[1] = SkColorGetG(c);
     34     byte[2] = SkColorGetR(c);
     35     byte[3] = SkColorGetA(c);
     36     return packed;
     37 }
     38 
     39 typedef uint32_t (*PackUnpremulProc)(SkColor);
     40 
     41 const struct {
     42     SkColorType         fColorType;
     43     PackUnpremulProc    fPackProc;
     44 } gUnpremul[] = {
     45     { kRGBA_8888_SkColorType, pack_unpremul_rgba },
     46     { kBGRA_8888_SkColorType, pack_unpremul_bgra },
     47 };
     48 
     49 static void fillCanvas(SkCanvas* canvas, SkColorType colorType, PackUnpremulProc proc) {
     50     // Don't strictly need a bitmap, but its a handy way to allocate the pixels
     51     SkBitmap bmp;
     52     bmp.allocN32Pixels(256, 256);
     53 
     54     for (int a = 0; a < 256; ++a) {
     55         uint32_t* pixels = bmp.getAddr32(0, a);
     56         for (int r = 0; r < 256; ++r) {
     57             pixels[r] = proc(SkColorSetARGB(a, r, 0, 0));
     58         }
     59     }
     60 
     61     SkImageInfo info = bmp.info();
     62     info.fColorType = colorType;
     63     info.fAlphaType = kUnpremul_SkAlphaType;
     64     canvas->writePixels(info, bmp.getPixels(), bmp.rowBytes(), 0, 0);
     65 }
     66 
     67 DEF_GPUTEST(PremulAlphaRoundTrip, reporter, factory) {
     68     const SkImageInfo info = SkImageInfo::MakeN32Premul(256, 256);
     69 
     70     SkAutoTUnref<SkBaseDevice> device;
     71     for (int dtype = 0; dtype < 2; ++dtype) {
     72 
     73         int glCtxTypeCnt = 1;
     74 #if SK_SUPPORT_GPU
     75         if (0 != dtype)  {
     76             glCtxTypeCnt = GrContextFactory::kGLContextTypeCnt;
     77         }
     78 #endif
     79         for (int glCtxType = 0; glCtxType < glCtxTypeCnt; ++glCtxType) {
     80             if (0 == dtype) {
     81                 device.reset(SkBitmapDevice::Create(info));
     82             } else {
     83 #if SK_SUPPORT_GPU
     84                 GrContextFactory::GLContextType type =
     85                     static_cast<GrContextFactory::GLContextType>(glCtxType);
     86                 if (!GrContextFactory::IsRenderingGLContext(type)) {
     87                     continue;
     88                 }
     89                 GrContext* context = factory->get(type);
     90                 if (NULL == context) {
     91                     continue;
     92                 }
     93 
     94                 device.reset(SkGpuDevice::Create(context, info, 0));
     95 #else
     96                 continue;
     97 #endif
     98             }
     99             SkCanvas canvas(device);
    100 
    101             for (size_t upmaIdx = 0; upmaIdx < SK_ARRAY_COUNT(gUnpremul); ++upmaIdx) {
    102                 fillCanvas(&canvas, gUnpremul[upmaIdx].fColorType, gUnpremul[upmaIdx].fPackProc);
    103 
    104                 const SkImageInfo info = SkImageInfo::Make(256, 256, gUnpremul[upmaIdx].fColorType,
    105                                                            kUnpremul_SkAlphaType);
    106                 SkBitmap readBmp1;
    107                 readBmp1.allocPixels(info);
    108                 SkBitmap readBmp2;
    109                 readBmp2.allocPixels(info);
    110 
    111                 readBmp1.eraseColor(0);
    112                 readBmp2.eraseColor(0);
    113 
    114                 canvas.readPixels(&readBmp1, 0, 0);
    115                 sk_tool_utils::write_pixels(&canvas, readBmp1, 0, 0, gUnpremul[upmaIdx].fColorType,
    116                                             kUnpremul_SkAlphaType);
    117                 canvas.readPixels(&readBmp2, 0, 0);
    118 
    119                 bool success = true;
    120                 for (int y = 0; y < 256 && success; ++y) {
    121                     const uint32_t* pixels1 = readBmp1.getAddr32(0, y);
    122                     const uint32_t* pixels2 = readBmp2.getAddr32(0, y);
    123                     for (int x = 0; x < 256 && success; ++x) {
    124                         REPORTER_ASSERT(reporter, success = pixels1[x] == pixels2[x]);
    125                     }
    126                 }
    127             }
    128         }
    129     }
    130 }
    131