1 /*
2 * Copyright 2015 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 "sk_tool_utils.h"
10 #include "SkCanvas.h"
11 #include "SkImage.h"
12 #include "SkRandom.h"
13 #include "SkSurface.h"
14
make_image()15 static sk_sp<SkImage> make_image() {
16 const SkImageInfo info = SkImageInfo::MakeN32Premul(319, 52);
17 auto surface(SkSurface::MakeRaster(info));
18 SkCanvas* canvas = surface->getCanvas();
19 canvas->drawColor(sk_tool_utils::color_to_565(0xFFF8F8F8));
20
21 SkPaint paint;
22 paint.setAntiAlias(true);
23
24 paint.setStyle(SkPaint::kStroke_Style);
25 for (int i = 0; i < 20; ++i) {
26 canvas->drawCircle(-4, 25, 20, paint);
27 canvas->translate(25, 0);
28 }
29 return surface->makeImageSnapshot();
30 }
31
32 DEF_SIMPLE_GM(mipmap, canvas, 400, 200) {
33 sk_sp<SkImage> img(make_image());//SkImage::NewFromEncoded(data));
34
35 SkPaint paint;
36 const SkRect dst = SkRect::MakeWH(177, 15);
37
38 paint.setTextSize(30);
39 SkString str;
40 str.printf("scale %g %g", dst.width() / img->width(), dst.height() / img->height());
41 // canvas->drawText(str.c_str(), str.size(), 300, 100, paint);
42
43 canvas->translate(20, 20);
44 for (int i = 0; i < 4; ++i) {
45 paint.setFilterQuality(SkFilterQuality(i));
46 canvas->drawImageRect(img.get(), dst, &paint);
47 canvas->translate(0, 20);
48 }
49 canvas->drawImage(img.get(), 20, 20, nullptr);
50 }
51
52 ///////////////////////////////////////////////////////////////////////////////////////////////////
53
54 // create a circle image computed raw, so we can wrap it as a linear or srgb image
make(sk_sp<SkColorSpace> cs)55 static sk_sp<SkImage> make(sk_sp<SkColorSpace> cs) {
56 const int N = 100;
57 SkImageInfo info = SkImageInfo::Make(N, N, kN32_SkColorType, kPremul_SkAlphaType, cs);
58 SkBitmap bm;
59 bm.allocPixels(info);
60
61 for (int y = 0; y < N; ++y) {
62 for (int x = 0; x < N; ++x) {
63 *bm.getAddr32(x, y) = (x ^ y) & 1 ? 0xFFFFFFFF : 0xFF000000;
64 }
65 }
66 bm.setImmutable();
67 return SkImage::MakeFromBitmap(bm);
68 }
69
show_mips(SkCanvas * canvas,SkImage * img)70 static void show_mips(SkCanvas* canvas, SkImage* img) {
71 SkPaint paint;
72 paint.setFilterQuality(kMedium_SkFilterQuality);
73
74 // Want to ensure we never draw fractional pixels, so we use an IRect
75 SkIRect dst = SkIRect::MakeWH(img->width(), img->height());
76 while (dst.width() > 5) {
77 canvas->drawImageRect(img, SkRect::Make(dst), &paint);
78 dst.offset(dst.width() + 10, 0);
79 dst.fRight = dst.fLeft + dst.width()/2;
80 dst.fBottom = dst.fTop + dst.height()/2;
81 }
82 }
83
84 /*
85 * Ensure that in L32 drawing mode, both images/mips look the same as each other, and
86 * their mips are darker than the original (since the mips should ignore the gamma in L32).
87 *
88 * Ensure that in S32 drawing mode, all images/mips look the same, and look correct (i.e.
89 * the mip levels match the original in brightness).
90 */
91 DEF_SIMPLE_GM(mipmap_srgb, canvas, 260, 230) {
92 sk_sp<SkImage> limg = make(nullptr);
93 sk_sp<SkImage> simg = make(SkColorSpace::MakeSRGB());
94
95 canvas->translate(10, 10);
96 show_mips(canvas, limg.get());
97 canvas->translate(0, limg->height() + 10.0f);
98 show_mips(canvas, simg.get());
99 }
100
101 ///////////////////////////////////////////////////////////////////////////////////////////////////
102
103 // create a gradient image computed raw, so we can wrap it as a linear or srgb image
make_g8_gradient(sk_sp<SkColorSpace> cs)104 static sk_sp<SkImage> make_g8_gradient(sk_sp<SkColorSpace> cs) {
105 const int N = 100;
106 SkImageInfo info = SkImageInfo::Make(N, N, kGray_8_SkColorType, kOpaque_SkAlphaType, cs);
107 SkBitmap bm;
108 bm.allocPixels(info);
109
110 for (int y = 0; y < N; ++y) {
111 for (int x = 0; x < N; ++x) {
112 *bm.getAddr8(x, y) = static_cast<uint8_t>(255.0f * ((x + y) / (2.0f * (N - 1))));
113 }
114 }
115 bm.setImmutable();
116 return SkImage::MakeFromBitmap(bm);
117 }
118
show_mips_only(SkCanvas * canvas,SkImage * img)119 static void show_mips_only(SkCanvas* canvas, SkImage* img) {
120 SkPaint paint;
121 paint.setFilterQuality(kMedium_SkFilterQuality);
122
123 // Want to ensure we never draw fractional pixels, so we use an IRect
124 SkIRect dst = SkIRect::MakeWH(img->width() / 2, img->height() / 2);
125 while (dst.width() > 5) {
126 canvas->drawImageRect(img, SkRect::Make(dst), &paint);
127 dst.offset(dst.width() + 10, 0);
128 dst.fRight = dst.fLeft + dst.width() / 2;
129 dst.fBottom = dst.fTop + dst.height() / 2;
130 }
131 }
132
133 /*
134 * Ensure that in L32 drawing mode, both images/mips look the same as each other, and
135 * their mips are darker than the original (since the mips should ignore the gamma in L32).
136 *
137 * Ensure that in S32 drawing mode, all images/mips look the same, and look correct (i.e.
138 * the mip levels match the original in brightness).
139 */
140 DEF_SIMPLE_GM(mipmap_gray8_srgb, canvas, 260, 230) {
141 sk_sp<SkImage> limg = make_g8_gradient(nullptr);
142 sk_sp<SkImage> simg = make_g8_gradient(SkColorSpace::MakeSRGB());
143
144 canvas->translate(10, 10);
145 show_mips_only(canvas, limg.get());
146 canvas->translate(0, limg->height() + 10.0f);
147 show_mips_only(canvas, simg.get());
148 }
149