brianosman | e5824b9 | 2016-02-26 11:57:23 -0800 | [diff] [blame] | 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 | |
brianosman | 33f6b3f | 2016-06-02 05:49:21 -0700 | [diff] [blame^] | 13 | DEF_SIMPLE_GM(gamma, canvas, 560, 200) { |
brianosman | e5824b9 | 2016-02-26 11:57:23 -0800 | [diff] [blame] | 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_SkAlphaType, |
| 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_SkAlphaType, |
| 35 | kSRGB_SkColorProfileType); |
| 36 | srgbGreyBmp.allocPixels(srgbGreyInfo); |
brianosman | 33f6b3f | 2016-06-02 05:49:21 -0700 | [diff] [blame^] | 37 | // 0xBC = 255 * linear_to_srgb(0.5f) |
brianosman | e5824b9 | 2016-02-26 11:57:23 -0800 | [diff] [blame] | 38 | srgbGreyBmp.eraseARGB(0xFF, 0xBC, 0xBC, 0xBC); |
| 39 | |
brianosman | 33f6b3f | 2016-06-02 05:49:21 -0700 | [diff] [blame^] | 40 | SkBitmap mipmapBmp; |
| 41 | SkImageInfo mipmapInfo = SkImageInfo::MakeN32(2, 2, kOpaque_SkAlphaType, |
| 42 | kSRGB_SkColorProfileType); |
| 43 | mipmapBmp.allocPixels(mipmapInfo); |
| 44 | SkPMColor* mipmapPixels = reinterpret_cast<SkPMColor*>(mipmapBmp.getPixels()); |
| 45 | // 0x89 = 255 * linear_to_srgb(0.25f) |
| 46 | mipmapPixels[0] = mipmapPixels[3] = SkPackARGB32(0xFF, 0x89, 0x89, 0x89); |
| 47 | // 0xE1 = 255 * linear_to_srgb(0.75f) |
| 48 | mipmapPixels[1] = mipmapPixels[2] = SkPackARGB32(0xFF, 0xE1, 0xE1, 0xE1); |
| 49 | |
brianosman | e5824b9 | 2016-02-26 11:57:23 -0800 | [diff] [blame] | 50 | SkPaint textPaint; |
| 51 | textPaint.setColor(SK_ColorWHITE); |
| 52 | |
| 53 | // Helpers: |
| 54 | auto advance = [&]() { |
| 55 | canvas->translate(tx, 0); |
| 56 | p.reset(); |
| 57 | }; |
| 58 | |
| 59 | auto nextRect = [&](const char* label, const char* label2) { |
| 60 | canvas->drawRect(r, p); |
| 61 | canvas->drawText(label, strlen(label), 0, sz + textPaint.getFontSpacing(), textPaint); |
| 62 | if (label2) { |
| 63 | canvas->drawText(label2, strlen(label2), 0, sz + 2 * textPaint.getFontSpacing(), |
| 64 | textPaint); |
| 65 | } |
| 66 | advance(); |
| 67 | }; |
| 68 | |
| 69 | auto nextBitmap = [&](const SkBitmap& bmp, const char* label) { |
| 70 | canvas->drawBitmap(bmp, 0, 0); |
| 71 | canvas->drawText(label, strlen(label), 0, sz + textPaint.getFontSpacing(), textPaint); |
| 72 | advance(); |
| 73 | }; |
| 74 | |
| 75 | auto nextXferRect = [&](SkColor srcColor, SkXfermode::Mode mode, SkColor dstColor) { |
| 76 | p.setColor(dstColor); |
| 77 | canvas->drawRect(r, p); |
| 78 | p.setColor(srcColor); |
| 79 | p.setXfermodeMode(mode); |
| 80 | canvas->drawRect(r, p); |
| 81 | |
| 82 | SkString srcText = SkStringPrintf("%08X", srcColor); |
| 83 | SkString dstText = SkStringPrintf("%08X", dstColor); |
| 84 | canvas->drawText(srcText.c_str(), srcText.size(), 0, sz + textPaint.getFontSpacing(), |
| 85 | textPaint); |
| 86 | const char* modeName = SkXfermode::ModeName(mode); |
| 87 | canvas->drawText(modeName, strlen(modeName), 0, sz + 2 * textPaint.getFontSpacing(), |
| 88 | textPaint); |
| 89 | canvas->drawText(dstText.c_str(), dstText.size(), 0, sz + 3 * textPaint.getFontSpacing(), |
| 90 | textPaint); |
| 91 | advance(); |
| 92 | }; |
| 93 | |
| 94 | // Necessary for certain Xfermode tests to work (ie some of them output white @ 50% alpha): |
| 95 | canvas->clear(SK_ColorBLACK); |
| 96 | |
| 97 | // *Everything* should be perceptually 50% grey. Only the first rectangle |
| 98 | // is guaranteed to draw that way, though. |
| 99 | canvas->save(); |
| 100 | |
| 101 | // Black/white dither, pixel perfect. This is ground truth. |
reed | 2ad1aa6 | 2016-03-09 09:50:50 -0800 | [diff] [blame] | 102 | p.setShader(SkShader::MakeBitmapShader(ditherBmp, rpt, rpt)); |
brianosman | e5824b9 | 2016-02-26 11:57:23 -0800 | [diff] [blame] | 103 | p.setFilterQuality(SkFilterQuality::kNone_SkFilterQuality); |
| 104 | nextRect("Dither", "Reference"); |
| 105 | |
| 106 | // Black/white dither, sampled at half-texel offset. Tests bilerp. |
| 107 | // NOTE: We need to apply a non-identity scale and/or rotation to trick |
| 108 | // the raster pipeline into *not* snapping to nearest. |
| 109 | SkMatrix offsetMatrix = SkMatrix::Concat( |
| 110 | SkMatrix::MakeScale(-1.0f), SkMatrix::MakeTrans(0.5f, 0.0f)); |
reed | 2ad1aa6 | 2016-03-09 09:50:50 -0800 | [diff] [blame] | 111 | p.setShader(SkShader::MakeBitmapShader(ditherBmp, rpt, rpt, &offsetMatrix)); |
brianosman | e5824b9 | 2016-02-26 11:57:23 -0800 | [diff] [blame] | 112 | p.setFilterQuality(SkFilterQuality::kMedium_SkFilterQuality); |
| 113 | nextRect("Dither", "Bilerp"); |
| 114 | |
| 115 | // Black/white dither, scaled down by 2x. Tests minification. |
| 116 | SkMatrix scaleMatrix = SkMatrix::MakeScale(0.5f); |
reed | 2ad1aa6 | 2016-03-09 09:50:50 -0800 | [diff] [blame] | 117 | p.setShader(SkShader::MakeBitmapShader(ditherBmp, rpt, rpt, &scaleMatrix)); |
brianosman | e5824b9 | 2016-02-26 11:57:23 -0800 | [diff] [blame] | 118 | p.setFilterQuality(SkFilterQuality::kMedium_SkFilterQuality); |
| 119 | nextRect("Dither", "Scale"); |
| 120 | |
brianosman | 33f6b3f | 2016-06-02 05:49:21 -0700 | [diff] [blame^] | 121 | // 25%/75% dither, scaled down by 2x. Tests ALL aspects of minification. Specifically, are |
| 122 | // sRGB sources decoded to linear before computing mipmaps? |
| 123 | p.setShader(SkShader::MakeBitmapShader(mipmapBmp, rpt, rpt, &scaleMatrix)); |
| 124 | p.setFilterQuality(SkFilterQuality::kMedium_SkFilterQuality); |
| 125 | nextRect("MipMaps", 0); |
| 126 | |
brianosman | e5824b9 | 2016-02-26 11:57:23 -0800 | [diff] [blame] | 127 | // 50% grey via paint color. |
| 128 | p.setColor(0xff7f7f7f); |
| 129 | nextRect("Color", 0); |
| 130 | |
| 131 | // Black -> White gradient, scaled to sample just the middle. |
| 132 | // Tests gradient interpolation. |
| 133 | SkPoint points[2] = { |
| 134 | SkPoint::Make(0 - (sz * 10), 0), |
| 135 | SkPoint::Make(sz + (sz * 10), 0) |
| 136 | }; |
| 137 | SkColor colors[2] = { SK_ColorBLACK, SK_ColorWHITE }; |
reed | 2ad1aa6 | 2016-03-09 09:50:50 -0800 | [diff] [blame] | 138 | p.setShader(SkGradientShader::MakeLinear(points, colors, nullptr, 2, |
| 139 | SkShader::kClamp_TileMode)); |
brianosman | e5824b9 | 2016-02-26 11:57:23 -0800 | [diff] [blame] | 140 | nextRect("Gradient", 0); |
| 141 | |
| 142 | // 50% grey from linear bitmap, with drawBitmap |
| 143 | nextBitmap(linearGreyBmp, "Lnr BMP"); |
| 144 | |
| 145 | // 50% grey from sRGB bitmap, with drawBitmap |
| 146 | nextBitmap(srgbGreyBmp, "sRGB BMP"); |
| 147 | |
| 148 | // Bitmap wrapped in a shader (linear): |
reed | 2ad1aa6 | 2016-03-09 09:50:50 -0800 | [diff] [blame] | 149 | p.setShader(SkShader::MakeBitmapShader(linearGreyBmp, rpt, rpt)); |
brianosman | e5824b9 | 2016-02-26 11:57:23 -0800 | [diff] [blame] | 150 | p.setFilterQuality(SkFilterQuality::kMedium_SkFilterQuality); |
| 151 | nextRect("Lnr BMP", "Shader"); |
| 152 | |
| 153 | // Bitmap wrapped in a shader (sRGB): |
reed | 2ad1aa6 | 2016-03-09 09:50:50 -0800 | [diff] [blame] | 154 | p.setShader(SkShader::MakeBitmapShader(srgbGreyBmp, rpt, rpt)); |
brianosman | e5824b9 | 2016-02-26 11:57:23 -0800 | [diff] [blame] | 155 | p.setFilterQuality(SkFilterQuality::kMedium_SkFilterQuality); |
| 156 | nextRect("sRGB BMP", "Shader"); |
| 157 | |
| 158 | // Carriage return. |
| 159 | canvas->restore(); |
| 160 | canvas->translate(0, 2 * sz); |
| 161 | |
| 162 | const U8CPU sqrtHalf = 0xB4; |
| 163 | const SkColor sqrtHalfAlpha = SkColorSetARGB(sqrtHalf, 0, 0, 0); |
| 164 | const SkColor sqrtHalfWhite = SkColorSetARGB(0xFF, sqrtHalf, sqrtHalf, sqrtHalf); |
| 165 | |
| 166 | // Xfermode tests, all done off-screen so certain modes work... |
| 167 | |
| 168 | canvas->saveLayer(nullptr, nullptr); |
| 169 | |
| 170 | nextXferRect(0x7fffffff, SkXfermode::kSrcOver_Mode, SK_ColorBLACK); |
| 171 | nextXferRect(0x7f000000, SkXfermode::kSrcOver_Mode, SK_ColorWHITE); |
| 172 | |
| 173 | nextXferRect(SK_ColorBLACK, SkXfermode::kDstOver_Mode, 0x7fffffff); |
| 174 | nextXferRect(SK_ColorWHITE, SkXfermode::kSrcIn_Mode, 0x7fff00ff); |
| 175 | nextXferRect(0x7fff00ff, SkXfermode::kDstIn_Mode, SK_ColorWHITE); |
| 176 | nextXferRect(sqrtHalfWhite, SkXfermode::kSrcIn_Mode, sqrtHalfAlpha); |
| 177 | nextXferRect(sqrtHalfAlpha, SkXfermode::kDstIn_Mode, sqrtHalfWhite); |
| 178 | |
| 179 | nextXferRect(0xff3f3f3f, SkXfermode::kPlus_Mode, 0xff3f3f3f); |
| 180 | nextXferRect(sqrtHalfWhite, SkXfermode::kModulate_Mode, sqrtHalfWhite); |
| 181 | |
| 182 | canvas->restore(); |
brianosman | e5824b9 | 2016-02-26 11:57:23 -0800 | [diff] [blame] | 183 | } |