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.h"
9 #include "SkBitmap.h"
10 #include "SkCanvas.h"
11 #include "SkColorPriv.h"
12
13 /**
14 * This GM checks that bitmap pixels are unpremultiplied before being exported
15 * to other formats. If unpremultiplication is implemented properly, this
16 * GM should come out completely white. If not, this GM looks like a row of two
17 * greyscale gradients above a row of grey lines.
18 * This tests both the ARGB4444 and ARGB8888 bitmap configurations.
19 */
20
21 constexpr int SLIDE_SIZE = 256;
22 constexpr int PIXEL_SIZE_8888 = SLIDE_SIZE / 256;
23 constexpr int PIXEL_SIZE_4444 = SLIDE_SIZE / 16;
24
init_bitmap(SkColorType ct,SkBitmap * bitmap)25 static void init_bitmap(SkColorType ct, SkBitmap* bitmap) {
26 bitmap->allocPixels(SkImageInfo::Make(SLIDE_SIZE, SLIDE_SIZE, ct,
27 kPremul_SkAlphaType));
28 bitmap->eraseColor(SK_ColorWHITE);
29 }
30
make_argb8888_gradient()31 static SkBitmap make_argb8888_gradient() {
32 SkBitmap bitmap;
33 init_bitmap(kN32_SkColorType, &bitmap);
34 uint8_t rowColor = 0;
35 for (int y = 0; y < SLIDE_SIZE; y++) {
36 uint32_t* dst = bitmap.getAddr32(0, y);
37 for (int x = 0; x < SLIDE_SIZE; x++) {
38 dst[x] = SkPackARGB32(rowColor, rowColor,
39 rowColor, rowColor);
40 }
41 if (y % PIXEL_SIZE_8888 == PIXEL_SIZE_8888 - 1) {
42 rowColor++;
43 }
44 }
45 return bitmap;
46 }
47
make_argb4444_gradient()48 static SkBitmap make_argb4444_gradient() {
49 SkBitmap bitmap;
50 init_bitmap(kARGB_4444_SkColorType, &bitmap);
51 uint8_t rowColor = 0;
52 for (int y = 0; y < SLIDE_SIZE; y++) {
53 uint16_t* dst = bitmap.getAddr16(0, y);
54 for (int x = 0; x < SLIDE_SIZE; x++) {
55 dst[x] = SkPackARGB4444(rowColor, rowColor,
56 rowColor, rowColor);
57 }
58 if (y % PIXEL_SIZE_4444 == PIXEL_SIZE_4444 - 1) {
59 rowColor++;
60 }
61 }
62 return bitmap;
63 }
64
make_argb8888_stripes()65 static SkBitmap make_argb8888_stripes() {
66 SkBitmap bitmap;
67 init_bitmap(kN32_SkColorType, &bitmap);
68 uint8_t rowColor = 0;
69 for (int y = 0; y < SLIDE_SIZE; y++) {
70 uint32_t* dst = bitmap.getAddr32(0, y);
71 for (int x = 0; x < SLIDE_SIZE; x++) {
72 dst[x] = SkPackARGB32(rowColor, rowColor,
73 rowColor, rowColor);
74 }
75 if (rowColor == 0) {
76 rowColor = 255;
77 } else {
78 rowColor = 0;
79 }
80 }
81 return bitmap;
82 }
83
make_argb4444_stripes()84 static SkBitmap make_argb4444_stripes() {
85 SkBitmap bitmap;
86 init_bitmap(kARGB_4444_SkColorType, &bitmap);
87 uint8_t rowColor = 0;
88 for (int y = 0; y < SLIDE_SIZE; y++) {
89 uint16_t* dst = bitmap.getAddr16(0, y);
90 for (int x = 0; x < SLIDE_SIZE; x++) {
91 dst[x] = SkPackARGB4444(rowColor, rowColor,
92 rowColor, rowColor);
93 }
94 if (rowColor == 0) {
95 rowColor = 15;
96 } else {
97 rowColor = 0;
98 }
99 }
100 return bitmap;
101 }
102
103 namespace skiagm {
104
105 class BitmapPremulGM : public GM {
106 public:
BitmapPremulGM()107 BitmapPremulGM() {
108 this->setBGColor(SK_ColorWHITE);
109 }
110
111 protected:
onShortName()112 SkString onShortName() override {
113 return SkString("bitmap_premul");
114 }
115
onISize()116 SkISize onISize() override {
117 return SkISize::Make(SLIDE_SIZE * 2, SLIDE_SIZE * 2);
118 }
119
onDraw(SkCanvas * canvas)120 void onDraw(SkCanvas* canvas) override {
121 SkScalar slideSize = SkIntToScalar(SLIDE_SIZE);
122 canvas->drawBitmap(make_argb8888_gradient(), 0, 0);
123 canvas->drawBitmap(make_argb4444_gradient(), slideSize, 0);
124 canvas->drawBitmap(make_argb8888_stripes(), 0, slideSize);
125 canvas->drawBitmap(make_argb4444_stripes(), slideSize, slideSize);
126 }
127
128 private:
129 typedef GM INHERITED;
130 };
131
132 DEF_GM( return new BitmapPremulGM; )
133 }
134