skia2/tests/BlendTest.cpp
Brian Salomon 27b4d8d8db Remove sample count from GrSurfaceDesc.
This leaves just width, height, and GrPixelConfig. Once we remove the
latter we can replace GrSurfaceDesc with SkISize.

Also remove unused GrRenderTarget::overrideResolveRect

Also remove GrSurfaceProxy::Renderable and use GrRenderable instead.

Change-Id: I652fe6169a22ca33d199b144ec6385286ac07b5a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/228570
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
2019-07-23 13:42:29 +00:00

207 lines
7.7 KiB
C++

/*
* 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();
}
}