1 /*
2 * Copyright 2013 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7 #include "gm.h"
8 #include "sk_tool_utils.h"
9
10 #include "SkBitmap.h"
11 #include "SkPaint.h"
12 #include "SkShader.h"
13 #include "GrContext.h"
14
15 namespace skiagm {
16
draw_bm(SkBitmap * bm)17 static void draw_bm(SkBitmap* bm) {
18 SkPaint bluePaint;
19 bluePaint.setColor(SK_ColorBLUE);
20
21 bm->allocN32Pixels(20, 20);
22 bm->eraseColor(SK_ColorRED);
23
24 SkCanvas canvas(*bm);
25 canvas.drawCircle(10, 10, 5, bluePaint);
26 }
27
draw_mask(SkBitmap * bm)28 static void draw_mask(SkBitmap* bm) {
29 SkPaint circlePaint;
30 circlePaint.setColor(SK_ColorBLACK);
31
32 bm->allocPixels(SkImageInfo::MakeA8(20, 20));
33 bm->eraseColor(SK_ColorTRANSPARENT);
34
35 SkCanvas canvas(*bm);
36 canvas.drawCircle(10, 10, 10, circlePaint);
37 }
38
39 class BitmapShaderGM : public GM {
40
41 protected:
onOnceBeforeDraw()42 void onOnceBeforeDraw() override {
43 this->setBGColor(sk_tool_utils::color_to_565(SK_ColorGRAY));
44 draw_bm(&fBitmap);
45 draw_mask(&fMask);
46 }
47
onShortName()48 SkString onShortName() override {
49 return SkString("bitmapshaders");
50 }
51
onISize()52 SkISize onISize() override {
53 return SkISize::Make(150, 100);
54 }
55
onDraw(SkCanvas * canvas)56 void onDraw(SkCanvas* canvas) override {
57 SkPaint paint;
58
59 for (int i = 0; i < 2; i++) {
60 SkMatrix s;
61 s.reset();
62 if (1 == i) {
63 s.setScale(1.5f, 1.5f);
64 s.postTranslate(2, 2);
65 }
66
67 canvas->save();
68 paint.setShader(SkShader::MakeBitmapShader(fBitmap, SkShader::kClamp_TileMode,
69 SkShader::kClamp_TileMode, &s));
70
71 // draw the shader with a bitmap mask
72 canvas->drawBitmap(fMask, 0, 0, &paint);
73 canvas->drawBitmap(fMask, 30, 0, &paint);
74
75 canvas->translate(0, 25);
76
77 canvas->drawCircle(10, 10, 10, paint);
78 canvas->drawCircle(40, 10, 10, paint); // no blue circle expected
79
80 canvas->translate(0, 25);
81
82 // clear the shader, colorized by a solid color with a bitmap mask
83 paint.setShader(nullptr);
84 paint.setColor(SK_ColorGREEN);
85 canvas->drawBitmap(fMask, 0, 0, &paint);
86 canvas->drawBitmap(fMask, 30, 0, &paint);
87
88 canvas->translate(0, 25);
89
90 paint.setShader(SkShader::MakeBitmapShader(fMask, SkShader::kRepeat_TileMode,
91 SkShader::kRepeat_TileMode, &s));
92 paint.setColor(SK_ColorRED);
93
94 // draw the mask using the shader and a color
95 canvas->drawRect(SkRect::MakeXYWH(0, 0, 20, 20), paint);
96 canvas->drawRect(SkRect::MakeXYWH(30, 0, 20, 20), paint);
97 canvas->restore();
98 canvas->translate(60, 0);
99 }
100 }
101
102 private:
103 SkBitmap fBitmap;
104 SkBitmap fMask;
105
106 typedef GM INHERITED;
107 };
108
109 DEF_SIMPLE_GM(hugebitmapshader, canvas, 100, 100) {
110 SkPaint paint;
111 SkBitmap bitmap;
112
113 // The huge height will exceed GL_MAX_TEXTURE_SIZE. We test that the GL backend will at least
114 // draw something with a default paint instead of drawing nothing.
115 //
116 // (See https://skia-review.googlesource.com/c/skia/+/73200)
117 int bitmapW = 1;
118 int bitmapH = 60000;
119 if (auto* ctx = canvas->getGrContext()) {
120 bitmapH = ctx->caps()->maxTextureSize() + 1;
121 }
122 bitmap.setInfo(SkImageInfo::MakeA8(bitmapW, bitmapH), bitmapW);
123 uint8_t* pixels = new uint8_t[bitmapH];
124 for(int i = 0; i < bitmapH; ++i) {
125 pixels[i] = i & 0xff;
126 }
127 bitmap.setPixels(pixels);
128
129 paint.setShader(SkShader::MakeBitmapShader(bitmap,
130 SkShader::kMirror_TileMode, SkShader::kMirror_TileMode));
131 paint.setColor(SK_ColorRED);
132 paint.setAntiAlias(true);
133 canvas->drawCircle(50, 50, 50, paint);
134 delete [] pixels;
135 }
136
137 //////////////////////////////////////////////////////////////////////////////
138
MyFactory(void *)139 static GM* MyFactory(void*) { return new BitmapShaderGM; }
140 static GMRegistry reg(MyFactory);
141
142 }
143