12e946b4bf
Bug: skia:6513 Change-Id: I51179a85f0912d3f899c368c30a943d346dd1d05 Reviewed-on: https://skia-review.googlesource.com/13589 Reviewed-by: Florin Malita <fmalita@chromium.org> Reviewed-by: Matt Sarett <msarett@google.com> Commit-Queue: Mike Reed <reed@google.com>
116 lines
3.8 KiB
C++
116 lines
3.8 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 "SkCanvas.h"
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#include "SkSurface.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 "GrContext.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 fill_canvas(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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const SkImageInfo info = SkImageInfo::Make(bmp.width(), bmp.height(),
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colorType, kUnpremul_SkAlphaType);
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canvas->writePixels(info, bmp.getPixels(), bmp.rowBytes(), 0, 0);
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}
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static void test_premul_alpha_roundtrip(skiatest::Reporter* reporter, SkSurface* surf) {
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SkCanvas* canvas = surf->getCanvas();
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for (size_t upmaIdx = 0; upmaIdx < SK_ARRAY_COUNT(gUnpremul); ++upmaIdx) {
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fill_canvas(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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DEF_TEST(PremulAlphaRoundTrip, reporter) {
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const SkImageInfo info = SkImageInfo::MakeN32Premul(256, 256);
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sk_sp<SkSurface> surf(SkSurface::MakeRaster(info));
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test_premul_alpha_roundtrip(reporter, surf.get());
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}
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#if SK_SUPPORT_GPU
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DEF_GPUTEST_FOR_RENDERING_CONTEXTS(PremulAlphaRoundTrip_Gpu, reporter, ctxInfo) {
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const SkImageInfo info = SkImageInfo::MakeN32Premul(256, 256);
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sk_sp<SkSurface> surf(SkSurface::MakeRenderTarget(ctxInfo.grContext(),
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SkBudgeted::kNo,
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info));
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test_premul_alpha_roundtrip(reporter, surf.get());
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}
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#endif
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