246 lines
8.3 KiB
C++
246 lines
8.3 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 "gm/gm.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkColor.h"
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#include "include/core/SkFont.h"
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#include "include/core/SkFontTypes.h"
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#include "include/core/SkImage.h"
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#include "include/core/SkImageFilter.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkPoint.h"
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#include "include/core/SkRect.h"
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#include "include/core/SkRefCnt.h"
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#include "include/core/SkScalar.h"
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#include "include/core/SkShader.h"
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#include "include/core/SkSize.h"
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#include "include/core/SkString.h"
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#include "include/core/SkSurface.h"
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#include "include/core/SkTileMode.h"
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#include "include/core/SkTypeface.h"
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#include "include/core/SkTypes.h"
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#include "include/effects/SkGradientShader.h"
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#include "include/effects/SkImageFilters.h"
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#include "tools/ToolUtils.h"
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#include <utility>
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static sk_sp<SkImage> make_src(int w, int h) {
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sk_sp<SkSurface> surface(SkSurface::MakeRasterN32Premul(w, h));
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SkCanvas* canvas = surface->getCanvas();
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SkPaint paint;
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SkPoint pts[] = { {0, 0}, {SkIntToScalar(w), SkIntToScalar(h)} };
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SkColor colors[] = {
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SK_ColorTRANSPARENT, SK_ColorGREEN, SK_ColorCYAN,
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SK_ColorRED, SK_ColorMAGENTA, SK_ColorWHITE,
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};
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paint.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors),
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SkTileMode::kClamp));
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canvas->drawPaint(paint);
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return surface->makeImageSnapshot();
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}
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static sk_sp<SkImage> make_dst(int w, int h) {
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sk_sp<SkSurface> surface(SkSurface::MakeRasterN32Premul(w, h));
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SkCanvas* canvas = surface->getCanvas();
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SkPaint paint;
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SkPoint pts[] = { {0, SkIntToScalar(h)}, {SkIntToScalar(w), 0} };
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SkColor colors[] = {
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SK_ColorBLUE, SK_ColorYELLOW, SK_ColorBLACK, SK_ColorGREEN,
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SK_ColorGRAY,
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};
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paint.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors),
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SkTileMode::kClamp));
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canvas->drawPaint(paint);
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return surface->makeImageSnapshot();
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}
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static void show_k_text(SkCanvas* canvas, SkScalar x, SkScalar y, const SkScalar k[]) {
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SkFont font(ToolUtils::create_portable_typeface(), 24);
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font.setEdging(SkFont::Edging::kAntiAlias);
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SkPaint paint;
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paint.setAntiAlias(true);
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for (int i = 0; i < 4; ++i) {
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SkString str;
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str.appendScalar(k[i]);
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SkScalar width = font.measureText(str.c_str(), str.size(), SkTextEncoding::kUTF8);
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canvas->drawString(str, x, y + font.getSize(), font, paint);
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x += width + SkIntToScalar(10);
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}
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}
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class ArithmodeGM : public skiagm::GM {
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SkString onShortName() override { return SkString("arithmode"); }
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SkISize onISize() override { return {640, 572}; }
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void onDraw(SkCanvas* canvas) override {
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constexpr int WW = 100,
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HH = 32;
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sk_sp<SkImage> src = make_src(WW, HH);
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sk_sp<SkImage> dst = make_dst(WW, HH);
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sk_sp<SkImageFilter> srcFilter = SkImageFilters::Image(src);
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sk_sp<SkImageFilter> dstFilter = SkImageFilters::Image(dst);
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constexpr SkScalar one = SK_Scalar1;
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constexpr SkScalar K[] = {
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0, 0, 0, 0,
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0, 0, 0, one,
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0, one, 0, 0,
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0, 0, one, 0,
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0, one, one, 0,
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0, one, -one, 0,
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0, one/2, one/2, 0,
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0, one/2, one/2, one/4,
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0, one/2, one/2, -one/4,
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one/4, one/2, one/2, 0,
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-one/4, one/2, one/2, 0,
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};
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const SkScalar* k = K;
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const SkScalar* stop = k + SK_ARRAY_COUNT(K);
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const SkRect rect = SkRect::MakeWH(WW, HH);
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SkScalar gap = SkIntToScalar(WW + 20);
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while (k < stop) {
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{
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SkAutoCanvasRestore acr(canvas, true);
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canvas->drawImage(src, 0, 0);
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canvas->translate(gap, 0);
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canvas->drawImage(dst, 0, 0);
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canvas->translate(gap, 0);
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SkPaint paint;
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paint.setImageFilter(SkImageFilters::Arithmetic(k[0], k[1], k[2], k[3], true,
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dstFilter, srcFilter, nullptr));
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canvas->saveLayer(&rect, &paint);
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canvas->restore();
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canvas->translate(gap, 0);
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show_k_text(canvas, 0, 0, k);
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}
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k += 4;
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canvas->translate(0, HH + 12);
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}
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// Draw two special cases to test enforcePMColor. In these cases, we
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// draw the dst bitmap twice, the first time it is halved and inverted,
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// leading to invalid premultiplied colors. If we enforcePMColor, these
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// invalid values should be clamped, and will not contribute to the
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// second draw.
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for (int i = 0; i < 2; i++) {
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const bool enforcePMColor = (i == 0);
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{
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SkAutoCanvasRestore acr(canvas, true);
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canvas->translate(gap, 0);
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canvas->drawImage(dst, 0, 0);
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canvas->translate(gap, 0);
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sk_sp<SkImageFilter> bg =
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SkImageFilters::Arithmetic(0, 0, -one / 2, 1, enforcePMColor, dstFilter,
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nullptr, nullptr);
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SkPaint p;
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p.setImageFilter(SkImageFilters::Arithmetic(0, one / 2, -one, 1, true,
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std::move(bg), dstFilter, nullptr));
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canvas->saveLayer(&rect, &p);
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canvas->restore();
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canvas->translate(gap, 0);
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// Label
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SkFont font(ToolUtils::create_portable_typeface(), 24);
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SkString str(enforcePMColor ? "enforcePM" : "no enforcePM");
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canvas->drawString(str, 0, font.getSize(), font, SkPaint());
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}
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canvas->translate(0, HH + 12);
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}
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}
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private:
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using INHERITED = GM;
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};
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DEF_GM( return new ArithmodeGM; )
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///////////////////////////////////////////////////////////////////////////////
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#include "include/effects/SkBlenders.h"
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class Arithmode2GM : public skiagm::GM {
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float fK1, fK2, fK3, fK4;
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sk_sp<SkImage> fSrc, fDst, fChecker;
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SkString onShortName() override { return SkString("arithmode_blender"); }
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SkISize onISize() override { return {430, 430}; }
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enum {
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W = 200,
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H = 200,
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};
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void onOnceBeforeDraw() override {
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// need something interesting, in case we're drawn w/o calling animate()
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fK1 = -0.25f;
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fK2 = 0.25f;
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fK3 = 0.25f;
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fK4 = 0;
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fSrc = make_src(W, H);
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fDst = make_dst(W, H);
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fChecker = ToolUtils::create_checkerboard_image(W, H, 0xFFBBBBBB, 0xFFEEEEEE, 8);
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}
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bool onAnimate(double nanos) override {
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double theta = nanos * 1e-6 * 0.001;
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fK1 = sin(theta + 0) * 0.25;
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fK2 = cos(theta + 1) * 0.25;
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fK3 = sin(theta + 2) * 0.25;
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fK4 = 0.5;
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return true;
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}
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void onDraw(SkCanvas* canvas) override {
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const SkRect rect = SkRect::MakeWH(W, H);
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canvas->drawImage(fSrc, 10, 10);
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canvas->drawImage(fDst, 10, 10 + fSrc->height() + 10);
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auto sampling = SkSamplingOptions();
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auto blender = SkBlenders::Arithmetic(fK1, fK2, fK3, fK4, true);
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SkPaint paint;
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canvas->translate(10 + fSrc->width() + 10, 10);
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canvas->drawImage(fChecker, 0, 0);
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// Draw via blend step
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canvas->saveLayer(&rect, nullptr);
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canvas->drawImage(fDst, 0, 0);
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paint.setBlender(blender);
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canvas->drawImage(fSrc, 0, 0, sampling, &paint);
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canvas->restore();
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canvas->translate(0, 10 + fSrc->height());
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canvas->drawImage(fChecker, 0, 0);
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// Draw via imagefilter (should appear the same as above)
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paint.setBlender(nullptr);
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paint.setImageFilter(SkImageFilters::Blend(blender,
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/* dst imagefilter */nullptr,
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SkImageFilters::Image(fSrc, sampling)));
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canvas->drawImage(fDst, 0, 0, sampling, &paint);
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}
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private:
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using INHERITED = GM;
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};
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DEF_GM( return new Arithmode2GM; )
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