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Side by Side Diff: gm/gamma.cpp

Issue 1740213003: New GM that exercises gamma-correctness in various parts of the pipeline. (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Fixed to use saveLayer so that the output images are opaque. Created 4 years, 9 months ago
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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
10 #include "Resources.h"
11 #include "SkGradientShader.h"
12
13 DEF_SIMPLE_GM(gamma, canvas, 500, 200) {
14 SkPaint p;
15 const SkScalar sz = 50.0f;
16 const int szInt = SkScalarTruncToInt(sz);
17 const SkScalar tx = sz + 5.0f;
18 const SkRect r = SkRect::MakeXYWH(0, 0, sz, sz);
19 SkShader::TileMode rpt = SkShader::kRepeat_TileMode;
20
21 SkBitmap ditherBmp;
22 ditherBmp.allocN32Pixels(2, 2);
23 SkPMColor* pixels = reinterpret_cast<SkPMColor*>(ditherBmp.getPixels());
24 pixels[0] = pixels[3] = SkPackARGB32(0xFF, 0xFF, 0xFF, 0xFF);
25 pixels[1] = pixels[2] = SkPackARGB32(0xFF, 0, 0, 0);
26
27 SkBitmap linearGreyBmp;
28 SkImageInfo linearGreyInfo = SkImageInfo::MakeN32(szInt, szInt, kOpaque_SkAl phaType,
29 kLinear_SkColorProfileType );
30 linearGreyBmp.allocPixels(linearGreyInfo);
31 linearGreyBmp.eraseARGB(0xFF, 0x7F, 0x7F, 0x7F);
32
33 SkBitmap srgbGreyBmp;
34 SkImageInfo srgbGreyInfo = SkImageInfo::MakeN32(szInt, szInt, kOpaque_SkAlph aType,
35 kSRGB_SkColorProfileType);
36 srgbGreyBmp.allocPixels(srgbGreyInfo);
37 srgbGreyBmp.eraseARGB(0xFF, 0xBC, 0xBC, 0xBC);
38
39 SkPaint textPaint;
40 textPaint.setColor(SK_ColorWHITE);
41
42 // Helpers:
43 auto advance = [&]() {
44 canvas->translate(tx, 0);
45 p.reset();
46 };
47
48 auto nextRect = [&](const char* label, const char* label2) {
49 canvas->drawRect(r, p);
50 canvas->drawText(label, strlen(label), 0, sz + textPaint.getFontSpacing( ), textPaint);
51 if (label2) {
52 canvas->drawText(label2, strlen(label2), 0, sz + 2 * textPaint.getFo ntSpacing(),
53 textPaint);
54 }
55 advance();
56 };
57
58 auto nextBitmap = [&](const SkBitmap& bmp, const char* label) {
59 canvas->drawBitmap(bmp, 0, 0);
60 canvas->drawText(label, strlen(label), 0, sz + textPaint.getFontSpacing( ), textPaint);
61 advance();
62 };
63
64 auto nextXferRect = [&](SkColor srcColor, SkXfermode::Mode mode, SkColor dst Color) {
65 p.setColor(dstColor);
66 canvas->drawRect(r, p);
67 p.setColor(srcColor);
68 p.setXfermodeMode(mode);
69 canvas->drawRect(r, p);
70
71 SkString srcText = SkStringPrintf("%08X", srcColor);
72 SkString dstText = SkStringPrintf("%08X", dstColor);
73 canvas->drawText(srcText.c_str(), srcText.size(), 0, sz + textPaint.getF ontSpacing(),
74 textPaint);
75 const char* modeName = SkXfermode::ModeName(mode);
76 canvas->drawText(modeName, strlen(modeName), 0, sz + 2 * textPaint.getFo ntSpacing(),
77 textPaint);
78 canvas->drawText(dstText.c_str(), dstText.size(), 0, sz + 3 * textPaint. getFontSpacing(),
79 textPaint);
80 advance();
81 };
82
83 // Necessary for certain Xfermode tests to work (ie some of them output whit e @ 50% alpha):
84 canvas->clear(SK_ColorBLACK);
85
86 // *Everything* should be perceptually 50% grey. Only the first rectangle
87 // is guaranteed to draw that way, though.
88 canvas->save();
89
90 // Black/white dither, pixel perfect. This is ground truth.
91 p.setShader(SkShader::CreateBitmapShader(
92 ditherBmp, rpt, rpt))->unref();
93 p.setFilterQuality(SkFilterQuality::kNone_SkFilterQuality);
94 nextRect("Dither", "Reference");
95
96 // Black/white dither, sampled at half-texel offset. Tests bilerp.
97 // NOTE: We need to apply a non-identity scale and/or rotation to trick
98 // the raster pipeline into *not* snapping to nearest.
99 SkMatrix offsetMatrix = SkMatrix::Concat(
100 SkMatrix::MakeScale(-1.0f), SkMatrix::MakeTrans(0.5f, 0.0f));
101 p.setShader(SkShader::CreateBitmapShader(
102 ditherBmp, rpt, rpt, &offsetMatrix))->unref();
103 p.setFilterQuality(SkFilterQuality::kMedium_SkFilterQuality);
104 nextRect("Dither", "Bilerp");
105
106 // Black/white dither, scaled down by 2x. Tests minification.
107 SkMatrix scaleMatrix = SkMatrix::MakeScale(0.5f);
108 p.setShader(SkShader::CreateBitmapShader(
109 ditherBmp, rpt, rpt, &scaleMatrix))->unref();
110 p.setFilterQuality(SkFilterQuality::kMedium_SkFilterQuality);
111 nextRect("Dither", "Scale");
112
113 // 50% grey via paint color.
114 p.setColor(0xff7f7f7f);
115 nextRect("Color", 0);
116
117 // Black -> White gradient, scaled to sample just the middle.
118 // Tests gradient interpolation.
119 SkPoint points[2] = {
120 SkPoint::Make(0 - (sz * 10), 0),
121 SkPoint::Make(sz + (sz * 10), 0)
122 };
123 SkColor colors[2] = { SK_ColorBLACK, SK_ColorWHITE };
124 p.setShader(SkGradientShader::CreateLinear(
125 points, colors, nullptr, 2, SkShader::kClamp_TileMode))->unref();
126 nextRect("Gradient", 0);
127
128 // 50% grey from linear bitmap, with drawBitmap
129 nextBitmap(linearGreyBmp, "Lnr BMP");
130
131 // 50% grey from sRGB bitmap, with drawBitmap
132 nextBitmap(srgbGreyBmp, "sRGB BMP");
133
134 // Bitmap wrapped in a shader (linear):
135 p.setShader(SkShader::CreateBitmapShader(linearGreyBmp, rpt, rpt))->unref();
136 p.setFilterQuality(SkFilterQuality::kMedium_SkFilterQuality);
137 nextRect("Lnr BMP", "Shader");
138
139 // Bitmap wrapped in a shader (sRGB):
140 p.setShader(SkShader::CreateBitmapShader(srgbGreyBmp, rpt, rpt))->unref();
141 p.setFilterQuality(SkFilterQuality::kMedium_SkFilterQuality);
142 nextRect("sRGB BMP", "Shader");
143
144 // Carriage return.
145 canvas->restore();
146 canvas->translate(0, 2 * sz);
147
148 const U8CPU sqrtHalf = 0xB4;
149 const SkColor sqrtHalfAlpha = SkColorSetARGB(sqrtHalf, 0, 0, 0);
150 const SkColor sqrtHalfWhite = SkColorSetARGB(0xFF, sqrtHalf, sqrtHalf, sqrtH alf);
151
152 // Xfermode tests, all done off-screen so certain modes work...
153
154 canvas->saveLayer(nullptr, nullptr);
155
156 nextXferRect(0x7fffffff, SkXfermode::kSrcOver_Mode, SK_ColorBLACK);
157 nextXferRect(0x7f000000, SkXfermode::kSrcOver_Mode, SK_ColorWHITE);
158
159 nextXferRect(SK_ColorBLACK, SkXfermode::kDstOver_Mode, 0x7fffffff);
160 nextXferRect(SK_ColorWHITE, SkXfermode::kSrcIn_Mode, 0x7fff00ff);
161 nextXferRect(0x7fff00ff, SkXfermode::kDstIn_Mode, SK_ColorWHITE);
162 nextXferRect(sqrtHalfWhite, SkXfermode::kSrcIn_Mode, sqrtHalfAlpha);
163 nextXferRect(sqrtHalfAlpha, SkXfermode::kDstIn_Mode, sqrtHalfWhite);
164
165 nextXferRect(0xff3f3f3f, SkXfermode::kPlus_Mode, 0xff3f3f3f);
166 nextXferRect(sqrtHalfWhite, SkXfermode::kModulate_Mode, sqrtHalfWhite);
167
168 canvas->restore();
169
170 canvas->restore();
171 }
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