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Side by Side Diff: gm/gamma.cpp

Issue 1734983003: New GM that exercises gamma-correctness in various parts of the pipeline. (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: 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, kLinear_SkColorProfileType);
29 linearGreyBmp.allocPixels(linearGreyInfo);
30 linearGreyBmp.eraseRGB(0x7F, 0x7F, 0x7F);
31
32 SkBitmap srgbGreyBmp;
33 SkImageInfo srgbGreyInfo = SkImageInfo::MakeN32(szInt, szInt, kOpaque_SkAlph aType, kSRGB_SkColorProfileType);
34 srgbGreyBmp.allocPixels(srgbGreyInfo);
35 srgbGreyBmp.eraseRGB(0xBC, 0xBC, 0xBC);
36
37 SkPaint textPaint;
38 textPaint.setColor(SK_ColorWHITE);
39
40 // Helpers:
41 auto nextRect = [&](const char* label) {
42 canvas->drawRect(r, p);
43 canvas->drawText(label, strlen(label), 0, sz + textPaint.getFontSpacing( ), textPaint);
44 canvas->translate(tx, 0);
45 p.reset();
46 };
47
48 auto nextBitmap = [&](const SkBitmap& bmp, const char* label) {
49 canvas->drawBitmap(bmp, 0, 0);
50 canvas->drawText(label, strlen(label), 0, sz + textPaint.getFontSpacing( ), textPaint);
51 canvas->translate(tx, 0);
52 };
53
54 auto nextXferRect = [&](SkColor srcColor, SkXfermode::Mode mode, SkColor dst Color) {
55 p.setColor(dstColor);
56 canvas->drawRect(r, p);
57 p.setColor(srcColor);
58 p.setXfermodeMode(mode);
59 canvas->drawRect(r, p);
60
61 char buf[32];
62 sprintf(buf, "%08X", srcColor);
63 canvas->drawText(buf, strlen(buf), 0, sz + textPaint.getFontSpacing(), t extPaint);
64 const char* modeName = SkXfermode::ModeName(mode);
65 canvas->drawText(modeName, strlen(modeName), 0, sz + 2 * textPaint.getFo ntSpacing(), textPaint);
66 sprintf(buf, "%08X", dstColor);
67 canvas->drawText(buf, strlen(buf), 0, sz + 3 * textPaint.getFontSpacing( ), textPaint);
68
69 canvas->translate(tx, 0);
70 p.reset();
71 };
72
73 // Necessary for certain Xfermodes to work:
74 canvas->clear(SK_ColorTRANSPARENT);
75
76 // *Everything* should be perceptually 50% grey. Only the first rectangle
77 // is guaranteed to draw that way, though.
78 canvas->save();
79
80 // Black/white dither, pixel perfect. This is ground truth.
81 p.setShader(SkShader::CreateBitmapShader(
82 ditherBmp, rpt, rpt))->unref();
83 p.setFilterQuality(SkFilterQuality::kNone_SkFilterQuality);
84 nextRect("Dither");
85
86 // Black/white dither, sampled at half-texel offset. Tests bilerp.
87 // NOTE: We need to apply a non-identity scale and/or rotation to trick
88 // the raster pipeline into *not* snapping to nearest.
89 SkMatrix offsetMatrix = SkMatrix::Concat(
90 SkMatrix::MakeScale(-1.0f), SkMatrix::MakeTrans(0.5f, 0.0f));
91 p.setShader(SkShader::CreateBitmapShader(
92 ditherBmp, rpt, rpt, &offsetMatrix))->unref();
93 p.setFilterQuality(SkFilterQuality::kMedium_SkFilterQuality);
94 nextRect("Bilerp");
95
96 // Black/white dither, scaled down by 2x. Tests minification.
97 SkMatrix scaleMatrix = SkMatrix::MakeScale(0.5f);
98 p.setShader(SkShader::CreateBitmapShader(
99 ditherBmp, rpt, rpt, &scaleMatrix))->unref();
100 p.setFilterQuality(SkFilterQuality::kMedium_SkFilterQuality);
101 nextRect("Scale");
102
103 // 50% grey via paint color.
104 p.setColor(0xff7f7f7f);
105 nextRect("Color");
106
107 // Black -> White gradient, scaled to sample just the middle.
108 // Tests gradient interpolation.
109 SkPoint points[2] = {
110 SkPoint::Make(0 - (sz * 10), 0),
111 SkPoint::Make(sz + (sz * 10), 0)
112 };
113 SkColor colors[2] = { SK_ColorBLACK, SK_ColorWHITE };
114 p.setShader(SkGradientShader::CreateLinear(
115 points, colors, nullptr, 2, SkShader::kClamp_TileMode))->unref();
116 nextRect("Gradient");
117
118 // 50% grey from linear bitmap, with drawBitmap
119 nextBitmap(linearGreyBmp, "Lnr BMP");
120 /* p.setShader(SkShader::CreateBitmapShader(
Brian Osman 2016/02/25 22:39:00 This is another test I want to add in, but I switc
121 linearGreyBmp, rpt, rpt))->unref();
122 p.setFilterQuality(SkFilterQuality::kNone_SkFilterQuality);
123 nextRect("Lnr BMP");*/
124
125 // 50% grey from sRGB bitmap, with drawBitmap
126 nextBitmap(srgbGreyBmp, "sRGB BMP");
127
128 // Carriage return.
129 canvas->restore();
130 canvas->translate(0, 2 * sz);
131
132 const U8CPU sqrtHalf = 0xB4;
133 const SkColor sqrtHalfAlpha = SkColorSetARGB(sqrtHalf, 0, 0, 0);
134 const SkColor sqrtHalfWhite = SkColorSetARGB(0xFF, sqrtHalf, sqrtHalf, sqrtH alf);
135
136 // Xfermode tests.
137 nextXferRect(0x7fffffff, SkXfermode::kSrcOver_Mode, SK_ColorBLACK);
138 nextXferRect(0x7f000000, SkXfermode::kSrcOver_Mode, SK_ColorWHITE);
139
140 nextXferRect(SK_ColorBLACK, SkXfermode::kDstOver_Mode, 0x7fffffff);
141 nextXferRect(SK_ColorWHITE, SkXfermode::kSrcIn_Mode, 0x7fff00ff);
142 nextXferRect(0x7fff00ff, SkXfermode::kDstIn_Mode, SK_ColorWHITE);
143 nextXferRect(sqrtHalfWhite, SkXfermode::kSrcIn_Mode, sqrtHalfAlpha);
144 nextXferRect(sqrtHalfAlpha, SkXfermode::kDstIn_Mode, sqrtHalfWhite);
145
146 nextXferRect(0xff3f3f3f, SkXfermode::kPlus_Mode, 0xff3f3f3f);
147 nextXferRect(sqrtHalfWhite, SkXfermode::kModulate_Mode, sqrtHalfWhite);
148
149 canvas->restore();
150 }
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