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
8 #include "gm/gm.h"
9 #include "include/core/SkBitmap.h"
10 #include "include/core/SkCanvas.h"
11 #include "include/core/SkColor.h"
12 #include "include/core/SkImageInfo.h"
13 #include "include/core/SkMatrix.h"
14 #include "include/core/SkPaint.h"
15 #include "include/core/SkRect.h"
16 #include "include/core/SkShader.h"
17 #include "include/core/SkSize.h"
18 #include "include/core/SkString.h"
19 #include "include/core/SkTileMode.h"
20 #include "include/core/SkTypes.h"
21 #include "include/gpu/GrRecordingContext.h"
22 #include "src/gpu/GrCaps.h"
23 #include "src/gpu/GrRecordingContextPriv.h"
24
25 namespace skiagm {
26
draw_bm(SkBitmap * bm)27 static void draw_bm(SkBitmap* bm) {
28 SkPaint bluePaint;
29 bluePaint.setColor(SK_ColorBLUE);
30
31 bm->allocN32Pixels(20, 20);
32 bm->eraseColor(SK_ColorRED);
33
34 SkCanvas canvas(*bm);
35 canvas.drawCircle(10, 10, 5, bluePaint);
36 }
37
draw_mask(SkBitmap * bm)38 static void draw_mask(SkBitmap* bm) {
39 SkPaint circlePaint;
40 circlePaint.setColor(SK_ColorBLACK);
41
42 bm->allocPixels(SkImageInfo::MakeA8(20, 20));
43 bm->eraseColor(SK_ColorTRANSPARENT);
44
45 SkCanvas canvas(*bm);
46 canvas.drawCircle(10, 10, 10, circlePaint);
47 }
48
49 class BitmapShaderGM : public GM {
50
51 protected:
onOnceBeforeDraw()52 void onOnceBeforeDraw() override {
53 this->setBGColor(SK_ColorGRAY);
54 draw_bm(&fBitmap);
55 draw_mask(&fMask);
56 }
57
onShortName()58 SkString onShortName() override {
59 return SkString("bitmapshaders");
60 }
61
onISize()62 SkISize onISize() override {
63 return SkISize::Make(150, 100);
64 }
65
onDraw(SkCanvas * canvas)66 void onDraw(SkCanvas* canvas) override {
67 SkPaint paint;
68
69 for (int i = 0; i < 2; i++) {
70 SkMatrix s;
71 s.reset();
72 if (1 == i) {
73 s.setScale(1.5f, 1.5f);
74 s.postTranslate(2, 2);
75 }
76
77 canvas->save();
78 paint.setShader(fBitmap.makeShader(&s));
79
80 // draw the shader with a bitmap mask
81 canvas->drawBitmap(fMask, 0, 0, &paint);
82 // no blue circle expected (the bitmap shader's coordinates are aligned to CTM still)
83 canvas->drawBitmap(fMask, 30, 0, &paint);
84
85 canvas->translate(0, 25);
86
87 canvas->drawCircle(10, 10, 10, paint);
88 canvas->drawCircle(40, 10, 10, paint); // no blue circle expected
89
90 canvas->translate(0, 25);
91
92 // clear the shader, colorized by a solid color with a bitmap mask
93 paint.setShader(nullptr);
94 paint.setColor(SK_ColorGREEN);
95 canvas->drawBitmap(fMask, 0, 0, &paint);
96 canvas->drawBitmap(fMask, 30, 0, &paint);
97
98 canvas->translate(0, 25);
99
100 paint.setShader(fMask.makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, &s));
101 paint.setColor(SK_ColorRED);
102
103 // draw the mask using the shader and a color
104 canvas->drawRect(SkRect::MakeXYWH(0, 0, 20, 20), paint);
105 canvas->drawRect(SkRect::MakeXYWH(30, 0, 20, 20), paint);
106 canvas->restore();
107 canvas->translate(60, 0);
108 }
109 }
110
111 private:
112 SkBitmap fBitmap;
113 SkBitmap fMask;
114
115 using INHERITED = GM;
116 };
117
118 DEF_SIMPLE_GM(hugebitmapshader, canvas, 100, 100) {
119 SkPaint paint;
120 SkBitmap bitmap;
121
122 // The huge height will exceed GL_MAX_TEXTURE_SIZE. We test that the GL backend will at least
123 // draw something with a default paint instead of drawing nothing.
124 //
125 // (See https://skia-review.googlesource.com/c/skia/+/73200)
126 int bitmapW = 1;
127 int bitmapH = 60000;
128 if (auto ctx = canvas->recordingContext()) {
129 bitmapH = ctx->priv().caps()->maxTextureSize() + 1;
130 }
131 bitmap.setInfo(SkImageInfo::MakeA8(bitmapW, bitmapH), bitmapW);
132 uint8_t* pixels = new uint8_t[bitmapH];
133 for(int i = 0; i < bitmapH; ++i) {
134 pixels[i] = i & 0xff;
135 }
136 bitmap.setPixels(pixels);
137
138 paint.setShader(bitmap.makeShader(SkTileMode::kMirror, SkTileMode::kMirror));
139 paint.setColor(SK_ColorRED);
140 paint.setAntiAlias(true);
141 canvas->drawCircle(50, 50, 50, paint);
142 delete [] pixels;
143 }
144
145 //////////////////////////////////////////////////////////////////////////////
146
147 DEF_GM( return new BitmapShaderGM; )
148
149 } // namespace skiagm
150