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- /*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #include "gm/gm.h"
- #include "include/core/SkBitmap.h"
- #include "include/core/SkBlendMode.h"
- #include "include/core/SkCanvas.h"
- #include "include/core/SkColor.h"
- #include "include/core/SkColorPriv.h"
- #include "include/core/SkColorSpace.h"
- #include "include/core/SkFilterQuality.h"
- #include "include/core/SkFont.h"
- #include "include/core/SkFontTypes.h"
- #include "include/core/SkImageInfo.h"
- #include "include/core/SkMatrix.h"
- #include "include/core/SkPaint.h"
- #include "include/core/SkPoint.h"
- #include "include/core/SkRect.h"
- #include "include/core/SkScalar.h"
- #include "include/core/SkShader.h"
- #include "include/core/SkString.h"
- #include "include/core/SkTileMode.h"
- #include "include/core/SkTypeface.h"
- #include "include/effects/SkGradientShader.h"
- #include "tools/ToolUtils.h"
- #include <string.h>
- DEF_SIMPLE_GM(gamma, canvas, 850, 200) {
- SkPaint p;
- const SkScalar sz = 50.0f;
- const int szInt = SkScalarTruncToInt(sz);
- const SkScalar tx = sz + 15.0f;
- const SkRect r = SkRect::MakeXYWH(0, 0, sz, sz);
- SkTileMode rpt = SkTileMode::kRepeat;
- auto srgbColorSpace = SkColorSpace::MakeSRGB();
- SkBitmap ditherBmp;
- ditherBmp.allocN32Pixels(2, 2);
- SkPMColor* pixels = reinterpret_cast<SkPMColor*>(ditherBmp.getPixels());
- pixels[0] = pixels[3] = SkPackARGB32(0xFF, 0xFF, 0xFF, 0xFF);
- pixels[1] = pixels[2] = SkPackARGB32(0xFF, 0, 0, 0);
- SkBitmap linearGreyBmp;
- SkImageInfo linearGreyInfo = SkImageInfo::MakeN32(szInt, szInt, kOpaque_SkAlphaType, nullptr);
- linearGreyBmp.allocPixels(linearGreyInfo);
- linearGreyBmp.eraseARGB(0xFF, 0x7F, 0x7F, 0x7F);
- SkBitmap srgbGreyBmp;
- SkImageInfo srgbGreyInfo = SkImageInfo::MakeN32(szInt, szInt, kOpaque_SkAlphaType,
- srgbColorSpace);
- srgbGreyBmp.allocPixels(srgbGreyInfo);
- // 0xBC = 255 * linear_to_srgb(0.5f)
- srgbGreyBmp.eraseARGB(0xFF, 0xBC, 0xBC, 0xBC);
- SkBitmap mipmapBmp;
- SkImageInfo mipmapInfo = SkImageInfo::Make(2, 2, kN32_SkColorType, kOpaque_SkAlphaType,
- srgbColorSpace);
- mipmapBmp.allocPixels(mipmapInfo);
- SkPMColor* mipmapPixels = reinterpret_cast<SkPMColor*>(mipmapBmp.getPixels());
- unsigned s25 = 0x89; // 255 * linear_to_srgb(0.25f)
- unsigned s75 = 0xE1; // 255 * linear_to_srgb(0.75f)
- mipmapPixels[0] = mipmapPixels[3] = SkPackARGB32(0xFF, s25, s25, s25);
- mipmapPixels[1] = mipmapPixels[2] = SkPackARGB32(0xFF, s75, s75, s75);
- SkFont font(ToolUtils::create_portable_typeface());
- SkPaint textPaint;
- textPaint.setAntiAlias(true);
- textPaint.setColor(SK_ColorWHITE);
- // Helpers:
- auto advance = [&]() {
- canvas->translate(tx, 0);
- p.reset();
- };
- auto drawString = [&](const char str[], SkScalar x, SkScalar y) {
- canvas->drawSimpleText(str, strlen(str), SkTextEncoding::kUTF8, x, y, font, textPaint);
- };
- auto nextRect = [&](const char* label, const char* label2) {
- canvas->drawRect(r, p);
- drawString(label, 0, sz + font.getSpacing());
- if (label2) {
- drawString(label2, 0, sz + 2 * font.getSpacing());
- }
- advance();
- };
- auto nextBitmap = [&](const SkBitmap& bmp, const char* label) {
- canvas->drawBitmap(bmp, 0, 0);
- drawString(label, 0, sz + font.getSpacing());
- advance();
- };
- auto nextXferRect = [&](SkColor srcColor, SkBlendMode mode, SkColor dstColor) {
- p.setColor(dstColor);
- canvas->drawRect(r, p);
- p.setColor(srcColor);
- p.setBlendMode(mode);
- canvas->drawRect(r, p);
- SkString srcText = SkStringPrintf("%08X", srcColor);
- SkString dstText = SkStringPrintf("%08X", dstColor);
- drawString(srcText.c_str(), 0, sz + font.getSpacing());
- const char* modeName = SkBlendMode_Name(mode);
- drawString(modeName, 0, sz + 2 * font.getSpacing());
- drawString(dstText.c_str(), 0, sz + 3 * font.getSpacing());
- advance();
- };
- // Necessary for certain Xfermode tests to work (ie some of them output white @ 50% alpha):
- canvas->clear(SK_ColorBLACK);
- // *Everything* should be perceptually 50% grey. Only the first rectangle
- // is guaranteed to draw that way, though.
- canvas->save();
- // Black/white dither, pixel perfect. This is ground truth.
- p.setShader(ditherBmp.makeShader(rpt, rpt));
- p.setFilterQuality(SkFilterQuality::kNone_SkFilterQuality);
- nextRect("Dither", "Reference");
- // Black/white dither, sampled at half-texel offset. Tests bilerp.
- // NOTE: We need to apply a non-identity scale and/or rotation to trick
- // the raster pipeline into *not* snapping to nearest.
- SkMatrix offsetMatrix = SkMatrix::Concat(
- SkMatrix::MakeScale(-1.0f), SkMatrix::MakeTrans(0.5f, 0.0f));
- p.setShader(ditherBmp.makeShader(rpt, rpt, &offsetMatrix));
- p.setFilterQuality(SkFilterQuality::kMedium_SkFilterQuality);
- nextRect("Dither", "Bilerp");
- // Black/white dither, scaled down by 2x. Tests minification.
- SkMatrix scaleMatrix = SkMatrix::MakeScale(0.5f);
- p.setShader(ditherBmp.makeShader(rpt, rpt, &scaleMatrix));
- p.setFilterQuality(SkFilterQuality::kMedium_SkFilterQuality);
- nextRect("Dither", "Scale");
- // 25%/75% dither, scaled down by 2x. Tests ALL aspects of minification. Specifically, are
- // sRGB sources decoded to linear before computing mipmaps?
- p.setShader(mipmapBmp.makeShader(rpt, rpt, &scaleMatrix));
- p.setFilterQuality(SkFilterQuality::kMedium_SkFilterQuality);
- nextRect("MipMaps", nullptr);
- // 50% grey via paint color. Paint color (SkColor) is specified to be sRGB!
- p.setColor(0xffbcbcbc);
- nextRect("Color", nullptr);
- {
- // Black -> White gradient, scaled to sample just the middle.
- // Tests gradient interpolation.
- SkPoint points[2] = {
- SkPoint::Make(0 - (sz * 10), 0),
- SkPoint::Make(sz + (sz * 10), 0)
- };
- SkColor colors[2] = { SK_ColorBLACK, SK_ColorWHITE };
- p.setShader(SkGradientShader::MakeLinear(points, colors, nullptr, 2, SkTileMode::kClamp));
- nextRect("Gradient", "Interpolation");
- }
- {
- // Shallow gradient around 50% (perceptual) gray. Endpoints are SkColor, so sRGB.
- // Tests gamma-correction of gradient stops before interpolation in two-stop case
- SkPoint points[2] = {
- SkPoint::Make(0, 0),
- SkPoint::Make(sz, 0)
- };
- SkColor colors[2] = { 0xffbbbbbb, 0xffbdbdbd };
- p.setShader(SkGradientShader::MakeLinear(points, colors, nullptr, 2, SkTileMode::kClamp));
- nextRect("Gradient", "Endpoints");
- }
- {
- // Shallow 3-stop gradient around 50% (perceptual) gray. Endpoints are SkColor, so sRGB.
- // Tests gamma-correction of gradient stops before interpolation in three-stop case
- SkPoint points[2] = {
- SkPoint::Make(0, 0),
- SkPoint::Make(sz, 0)
- };
- SkColor colors[3] = { 0xffbbbbbb, 0xffbdbdbd, 0xffbbbbbb };
- p.setShader(SkGradientShader::MakeLinear(points, colors, nullptr, 3, SkTileMode::kClamp));
- nextRect("Gradient", "3-Stop");
- }
- {
- // Shallow N-stop gradient around 50% (perceptual) gray. Endpoints are SkColor, so sRGB.
- // Tests gamma-correction of gradient stops before interpolation in texture implementation
- SkPoint points[2] = {
- SkPoint::Make(0, 0),
- SkPoint::Make(sz, 0)
- };
- SkColor colors[5] = { 0xffbbbbbb, 0xffbdbdbd, 0xffbbbbbb, 0xffbdbdbd, 0xffbbbbbb };
- p.setShader(SkGradientShader::MakeLinear(points, colors, nullptr, 5, SkTileMode::kClamp));
- nextRect("Gradient", "Texture");
- }
- // 50% grey from linear bitmap, with drawBitmap
- nextBitmap(linearGreyBmp, "Lnr BMP");
- // 50% grey from sRGB bitmap, with drawBitmap
- nextBitmap(srgbGreyBmp, "sRGB BMP");
- // Bitmap wrapped in a shader (linear):
- p.setShader(linearGreyBmp.makeShader(rpt, rpt));
- p.setFilterQuality(SkFilterQuality::kMedium_SkFilterQuality);
- nextRect("Lnr BMP", "Shader");
- // Bitmap wrapped in a shader (sRGB):
- p.setShader(srgbGreyBmp.makeShader(rpt, rpt));
- p.setFilterQuality(SkFilterQuality::kMedium_SkFilterQuality);
- nextRect("sRGB BMP", "Shader");
- // Carriage return.
- canvas->restore();
- canvas->translate(0, 2 * sz);
- // Xfermode tests, all done off-screen so certain modes work...
- canvas->saveLayer(nullptr, nullptr);
- nextXferRect(0x7fffffff, SkBlendMode::kSrcOver, SK_ColorBLACK);
- nextXferRect(0x7f000000, SkBlendMode::kSrcOver, SK_ColorWHITE);
- nextXferRect(SK_ColorBLACK, SkBlendMode::kDstOver, 0x7fffffff);
- nextXferRect(SK_ColorWHITE, SkBlendMode::kSrcIn, 0x7fff00ff);
- nextXferRect(0x7fff00ff, SkBlendMode::kDstIn, SK_ColorWHITE);
- // 0x89 = 255 * linear_to_srgb(0.25)
- nextXferRect(0xff898989, SkBlendMode::kPlus, 0xff898989);
- // 0xDB = 255 * linear_to_srgb(sqrt(0.5))
- nextXferRect(0xffdbdbdb, SkBlendMode::kModulate, 0xffdbdbdb);
- canvas->restore();
- }
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