2 * Copyright 2013 Google Inc.
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
10 #include "SkGradientShader.h"
12 class AlphaGradientsGM : public skiagm::GM {
17 SkString onShortName() override {
18 return SkString("alphagradients");
21 SkISize onISize() override {
22 return SkISize::Make(640, 480);
25 static void draw_grad(SkCanvas* canvas, const SkRect& r,
26 SkColor c0, SkColor c1, bool doPreMul) {
27 SkColor colors[] = { c0, c1 };
28 SkPoint pts[] = { { r.fLeft, r.fTop }, { r.fRight, r.fBottom } };
30 uint32_t flags = doPreMul ? SkGradientShader::kInterpolateColorsInPremul_Flag : 0;
31 paint.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, 2,
32 SkShader::kClamp_TileMode, flags, nullptr));
33 canvas->drawRect(r, paint);
35 paint.setShader(nullptr);
36 paint.setStyle(SkPaint::kStroke_Style);
37 canvas->drawRect(r, paint);
40 void onDraw(SkCanvas* canvas) override {
45 { 0xFFFFFFFF, 0x00000000 },
46 { 0xFFFFFFFF, 0x00FF0000 },
47 { 0xFFFFFFFF, 0x00FFFF00 },
48 { 0xFFFFFFFF, 0x00FFFFFF },
49 { 0xFFFF0000, 0x00000000 },
50 { 0xFFFF0000, 0x00FF0000 },
51 { 0xFFFF0000, 0x00FFFF00 },
52 { 0xFFFF0000, 0x00FFFFFF },
53 { 0xFF0000FF, 0x00000000 },
54 { 0xFF0000FF, 0x00FF0000 },
55 { 0xFF0000FF, 0x00FFFF00 },
56 { 0xFF0000FF, 0x00FFFFFF },
59 SkRect r = SkRect::MakeWH(300, 30);
61 canvas->translate(10, 10);
63 for (int doPreMul = 0; doPreMul <= 1; ++doPreMul) {
65 for (size_t i = 0; i < SK_ARRAY_COUNT(gRec); ++i) {
66 draw_grad(canvas, r, gRec[i].fColor0, gRec[i].fColor1, SkToBool(doPreMul));
67 canvas->translate(0, r.height() + 8);
70 canvas->translate(r.width() + 10, 0);
75 typedef skiagm::GM INHERITED;
78 DEF_GM(return new AlphaGradientsGM;)