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- /*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #include "include/core/SkBitmap.h"
- #include "include/core/SkBlendMode.h"
- #include "include/core/SkCanvas.h"
- #include "include/core/SkColor.h"
- #include "include/core/SkColorSpace.h"
- #include "include/core/SkImageInfo.h"
- #include "include/core/SkPaint.h"
- #include "include/core/SkPoint.h"
- #include "include/core/SkRect.h"
- #include "include/core/SkRefCnt.h"
- #include "include/core/SkSurface.h"
- #include "include/core/SkTypes.h"
- #include "include/gpu/GrBackendSurface.h"
- #include "include/gpu/GrContext.h"
- #include "include/gpu/GrTexture.h"
- #include "include/gpu/GrTypes.h"
- #include "include/private/GrTypesPriv.h"
- #include "src/gpu/GrContextPriv.h"
- #include "src/gpu/GrResourceProvider.h"
- #include "tests/Test.h"
- #include "tools/gpu/GrContextFactory.h"
- #include <initializer_list>
- #include <vector>
- struct Results { int diffs, diffs_0x00, diffs_0xff, diffs_by_1; };
- static bool acceptable(const Results& r) {
- #if 0
- SkDebugf("%d diffs, %d at 0x00, %d at 0xff, %d off by 1, all out of 65536\n",
- r.diffs, r.diffs_0x00, r.diffs_0xff, r.diffs_by_1);
- #endif
- return r.diffs_by_1 == r.diffs // never off by more than 1
- && r.diffs_0x00 == 0 // transparent must stay transparent
- && r.diffs_0xff == 0; // opaque must stay opaque
- }
- template <typename Fn>
- static Results test(Fn&& multiply) {
- Results r = { 0,0,0,0 };
- for (int x = 0; x < 256; x++) {
- for (int y = 0; y < 256; y++) {
- int p = multiply(x, y),
- ideal = (x*y+127)/255;
- if (p != ideal) {
- r.diffs++;
- if (x == 0x00 || y == 0x00) { r.diffs_0x00++; }
- if (x == 0xff || y == 0xff) { r.diffs_0xff++; }
- if (SkTAbs(ideal - p) == 1) { r.diffs_by_1++; }
- }
- }}
- return r;
- }
- DEF_TEST(Blend_byte_multiply, r) {
- // These are all temptingly close but fundamentally broken.
- int (*broken[])(int, int) = {
- [](int x, int y) { return (x*y)>>8; },
- [](int x, int y) { return (x*y+128)>>8; },
- [](int x, int y) { y += y>>7; return (x*y)>>8; },
- };
- for (auto multiply : broken) { REPORTER_ASSERT(r, !acceptable(test(multiply))); }
- // These are fine to use, but not perfect.
- int (*fine[])(int, int) = {
- [](int x, int y) { return (x*y+x)>>8; },
- [](int x, int y) { return (x*y+y)>>8; },
- [](int x, int y) { return (x*y+255)>>8; },
- [](int x, int y) { y += y>>7; return (x*y+128)>>8; },
- };
- for (auto multiply : fine) { REPORTER_ASSERT(r, acceptable(test(multiply))); }
- // These are pefect.
- int (*perfect[])(int, int) = {
- [](int x, int y) { return (x*y+127)/255; }, // Duh.
- [](int x, int y) { int p = (x*y+128); return (p+(p>>8))>>8; },
- [](int x, int y) { return ((x*y+128)*257)>>16; },
- };
- for (auto multiply : perfect) { REPORTER_ASSERT(r, test(multiply).diffs == 0); }
- }
- namespace {
- static sk_sp<SkSurface> create_gpu_surface_backend_texture_as_render_target(
- GrContext* context, int sampleCnt, int width, int height, SkColorType colorType,
- GrPixelConfig config, GrSurfaceOrigin origin,
- sk_sp<GrTexture>* backingSurface) {
- GrSurfaceDesc backingDesc;
- backingDesc.fWidth = width;
- backingDesc.fHeight = height;
- backingDesc.fConfig = config;
- auto resourceProvider = context->priv().resourceProvider();
- *backingSurface = resourceProvider->createTexture(backingDesc, GrRenderable::kYes, sampleCnt,
- SkBudgeted::kNo, GrProtected::kNo,
- GrResourceProvider::Flags::kNoPendingIO);
- if (!(*backingSurface)) {
- return nullptr;
- }
- GrBackendTexture backendTex = (*backingSurface)->getBackendTexture();
- sk_sp<SkSurface> surface =
- SkSurface::MakeFromBackendTextureAsRenderTarget(context, backendTex, origin,
- sampleCnt, colorType, nullptr, nullptr);
- return surface;
- }
- }
- // Tests blending to a surface with no texture available.
- DEF_GPUTEST_FOR_GL_RENDERING_CONTEXTS(ES2BlendWithNoTexture, reporter, ctxInfo) {
- GrContext* context = ctxInfo.grContext();
- const int kWidth = 10;
- const int kHeight = 10;
- const GrPixelConfig kConfig = kRGBA_8888_GrPixelConfig;
- const SkColorType kColorType = kRGBA_8888_SkColorType;
- // Build our test cases:
- struct RectAndSamplePoint {
- SkRect rect;
- SkIPoint outPoint;
- SkIPoint inPoint;
- } allRectsAndPoints[3] = {
- {SkRect::MakeXYWH(0, 0, 5, 5), SkIPoint::Make(7, 7), SkIPoint::Make(2, 2)},
- {SkRect::MakeXYWH(2, 2, 5, 5), SkIPoint::Make(1, 1), SkIPoint::Make(4, 4)},
- {SkRect::MakeXYWH(5, 5, 5, 5), SkIPoint::Make(2, 2), SkIPoint::Make(7, 7)},
- };
- struct TestCase {
- RectAndSamplePoint fRectAndPoints;
- SkRect fClip;
- int fSampleCnt;
- GrSurfaceOrigin fOrigin;
- };
- std::vector<TestCase> testCases;
- for (auto origin : { kTopLeft_GrSurfaceOrigin, kBottomLeft_GrSurfaceOrigin}) {
- for (int sampleCnt : {1, 4}) {
- for (auto rectAndPoints : allRectsAndPoints) {
- for (auto clip : {SkRect::MakeXYWH(0, 0, 10, 10), SkRect::MakeXYWH(1, 1, 8, 8)}) {
- testCases.push_back({rectAndPoints, clip, sampleCnt, origin});
- }
- }
- }
- }
- // Run each test case:
- for (auto testCase : testCases) {
- int sampleCnt = testCase.fSampleCnt;
- SkRect paintRect = testCase.fRectAndPoints.rect;
- SkIPoint outPoint = testCase.fRectAndPoints.outPoint;
- SkIPoint inPoint = testCase.fRectAndPoints.inPoint;
- GrSurfaceOrigin origin = testCase.fOrigin;
- sk_sp<GrTexture> backingSurface;
- // BGRA forces a framebuffer blit on ES2.
- sk_sp<SkSurface> surface = create_gpu_surface_backend_texture_as_render_target(
- context, sampleCnt, kWidth, kHeight, kColorType, kConfig, origin, &backingSurface);
- if (!surface && sampleCnt > 1) {
- // Some platforms don't support MSAA.
- continue;
- }
- REPORTER_ASSERT(reporter, !!surface);
- // Fill our canvas with 0xFFFF80
- SkCanvas* canvas = surface->getCanvas();
- canvas->clipRect(testCase.fClip, false);
- SkPaint black_paint;
- black_paint.setColor(SkColorSetRGB(0xFF, 0xFF, 0x80));
- canvas->drawRect(SkRect::MakeXYWH(0, 0, kWidth, kHeight), black_paint);
- // Blend 2x2 pixels at 5,5 with 0x80FFFF. Use multiply blend mode as this will trigger
- // a copy of the destination.
- SkPaint white_paint;
- white_paint.setColor(SkColorSetRGB(0x80, 0xFF, 0xFF));
- white_paint.setBlendMode(SkBlendMode::kMultiply);
- canvas->drawRect(paintRect, white_paint);
- // Read the result into a bitmap.
- SkBitmap bitmap;
- REPORTER_ASSERT(reporter, bitmap.tryAllocPixels(SkImageInfo::Make(
- kWidth, kHeight, kColorType, kPremul_SkAlphaType)));
- REPORTER_ASSERT(
- reporter,
- surface->readPixels(bitmap.info(), bitmap.getPixels(), bitmap.rowBytes(), 0, 0));
- // Check the in/out pixels.
- REPORTER_ASSERT(reporter, bitmap.getColor(outPoint.x(), outPoint.y()) ==
- SkColorSetRGB(0xFF, 0xFF, 0x80));
- REPORTER_ASSERT(reporter, bitmap.getColor(inPoint.x(), inPoint.y()) ==
- SkColorSetRGB(0x80, 0xFF, 0x80));
- // Clean up - surface depends on backingSurface and must be released first.
- surface.reset();
- backingSurface.reset();
- }
- }
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