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