зеркало из https://github.com/mozilla/moz-skia.git
135 строки
4.4 KiB
C++
135 строки
4.4 KiB
C++
/*
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* Copyright 2011 Google Inc.
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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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#include "SkBitmapDevice.h"
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#include "SkCanvas.h"
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#include "SkConfig8888.h"
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#include "Test.h"
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#include "sk_tool_utils.h"
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#if SK_SUPPORT_GPU
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#include "GrContextFactory.h"
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#include "SkGpuDevice.h"
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#endif
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static uint32_t pack_unpremul_rgba(SkColor c) {
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uint32_t packed;
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uint8_t* byte = reinterpret_cast<uint8_t*>(&packed);
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byte[0] = SkColorGetR(c);
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byte[1] = SkColorGetG(c);
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byte[2] = SkColorGetB(c);
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byte[3] = SkColorGetA(c);
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return packed;
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}
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static uint32_t pack_unpremul_bgra(SkColor c) {
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uint32_t packed;
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uint8_t* byte = reinterpret_cast<uint8_t*>(&packed);
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byte[0] = SkColorGetB(c);
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byte[1] = SkColorGetG(c);
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byte[2] = SkColorGetR(c);
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byte[3] = SkColorGetA(c);
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return packed;
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}
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typedef uint32_t (*PackUnpremulProc)(SkColor);
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const struct {
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SkColorType fColorType;
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PackUnpremulProc fPackProc;
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} gUnpremul[] = {
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{ kRGBA_8888_SkColorType, pack_unpremul_rgba },
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{ kBGRA_8888_SkColorType, pack_unpremul_bgra },
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};
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static void fillCanvas(SkCanvas* canvas, SkColorType colorType, PackUnpremulProc proc) {
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// Don't strictly need a bitmap, but its a handy way to allocate the pixels
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SkBitmap bmp;
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bmp.allocN32Pixels(256, 256);
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for (int a = 0; a < 256; ++a) {
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uint32_t* pixels = bmp.getAddr32(0, a);
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for (int r = 0; r < 256; ++r) {
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pixels[r] = proc(SkColorSetARGB(a, r, 0, 0));
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}
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}
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SkImageInfo info = bmp.info();
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info.fColorType = colorType;
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info.fAlphaType = kUnpremul_SkAlphaType;
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canvas->writePixels(info, bmp.getPixels(), bmp.rowBytes(), 0, 0);
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}
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DEF_GPUTEST(PremulAlphaRoundTrip, reporter, factory) {
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const SkImageInfo info = SkImageInfo::MakeN32Premul(256, 256);
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for (int dtype = 0; dtype < 2; ++dtype) {
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int glCtxTypeCnt = 1;
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#if SK_SUPPORT_GPU
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if (0 != dtype) {
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glCtxTypeCnt = GrContextFactory::kGLContextTypeCnt;
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}
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#endif
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for (int glCtxType = 0; glCtxType < glCtxTypeCnt; ++glCtxType) {
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SkAutoTUnref<SkBaseDevice> device;
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if (0 == dtype) {
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device.reset(SkBitmapDevice::Create(info));
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} else {
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#if SK_SUPPORT_GPU
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GrContextFactory::GLContextType type =
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static_cast<GrContextFactory::GLContextType>(glCtxType);
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if (!GrContextFactory::IsRenderingGLContext(type)) {
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continue;
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}
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GrContext* context = factory->get(type);
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if (NULL == context) {
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continue;
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}
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device.reset(SkGpuDevice::Create(context, info, 0));
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#else
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continue;
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#endif
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}
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SkCanvas canvas(device);
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for (size_t upmaIdx = 0; upmaIdx < SK_ARRAY_COUNT(gUnpremul); ++upmaIdx) {
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fillCanvas(&canvas, gUnpremul[upmaIdx].fColorType, gUnpremul[upmaIdx].fPackProc);
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const SkImageInfo info = SkImageInfo::Make(256, 256, gUnpremul[upmaIdx].fColorType,
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kUnpremul_SkAlphaType);
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SkBitmap readBmp1;
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readBmp1.allocPixels(info);
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SkBitmap readBmp2;
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readBmp2.allocPixels(info);
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readBmp1.eraseColor(0);
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readBmp2.eraseColor(0);
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canvas.readPixels(&readBmp1, 0, 0);
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sk_tool_utils::write_pixels(&canvas, readBmp1, 0, 0, gUnpremul[upmaIdx].fColorType,
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kUnpremul_SkAlphaType);
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canvas.readPixels(&readBmp2, 0, 0);
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bool success = true;
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for (int y = 0; y < 256 && success; ++y) {
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const uint32_t* pixels1 = readBmp1.getAddr32(0, y);
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const uint32_t* pixels2 = readBmp2.getAddr32(0, y);
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for (int x = 0; x < 256 && success; ++x) {
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// We see sporadic failures here. May help to see where it goes wrong.
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if (pixels1[x] != pixels2[x]) {
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SkDebugf("%x != %x, x = %d, y = %d\n", pixels1[x], pixels2[x], x, y);
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}
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REPORTER_ASSERT(reporter, success = pixels1[x] == pixels2[x]);
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}
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}
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}
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}
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}
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}
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