tools/sk_tool_utils.cpp - skia - Git at Google

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "sk_tool_utils.h"

 #include "Resources.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkCommonFlags.h"
 #include "SkFontMgr.h"
 #include "SkFontStyle.h"
 #include "SkImage.h"
 #include "SkPixelRef.h"
 #include "SkPM4f.h"
 #include "SkPoint3.h"
 #include "SkShader.h"
 #include "SkSurface.h"
 #include "SkTestScalerContext.h"
 #include "SkTextBlob.h"

 namespace sk_tool_utils {

 static const char* platform_os_name() {
     for (int index = 0; index < FLAGS_key.count(); index += 2) {
         if (!strcmp("os", FLAGS_key[index])) {
             return FLAGS_key[index + 1];
         }
     }
     return "";
 }

 sk_sp<SkTypeface> emoji_typeface() {
 #if defined(SK_BUILD_FOR_WIN)
     sk_sp<SkFontMgr> fm(SkFontMgr::RefDefault());
     const char *colorEmojiFontName = "Segoe UI Emoji";
     sk_sp<SkTypeface> typeface(fm->matchFamilyStyle(colorEmojiFontName, SkFontStyle()));
     if (typeface) {
         return typeface;
     }
     sk_sp<SkTypeface> fallback(fm->matchFamilyStyleCharacter(
         colorEmojiFontName, SkFontStyle(), nullptr /* bcp47 */, 0 /* bcp47Count */,
         0x1f4b0 /* character: 💰 */));
     if (fallback) {
         return fallback;
     }
     // If we don't have Segoe UI Emoji and can't find a fallback, try Segoe UI Symbol.
     // Windows 7 does not have Segoe UI Emoji; Segoe UI Symbol has the (non - color) emoji.
     return SkTypeface::MakeFromName("Segoe UI Symbol", SkFontStyle());

 #elif defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)
     return SkTypeface::MakeFromName("Apple Color Emoji", SkFontStyle());

 #else
     return MakeResourceAsTypeface("fonts/Funkster.ttf");

 #endif
 }

 const char* emoji_sample_text() {
 #if defined(SK_BUILD_FOR_WIN) || defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)
     return "\xF0\x9F\x92\xB0" "\xF0\x9F\x8F\xA1" "\xF0\x9F\x8E\x85"  // 💰🏡🎅
            "\xF0\x9F\x8D\xAA" "\xF0\x9F\x8D\x95" "\xF0\x9F\x9A\x80"  // 🍪🍕🚀
            "\xF0\x9F\x9A\xBB" "\xF0\x9F\x92\xA9" "\xF0\x9F\x93\xB7"  // 🚻💩📷
            "\xF0\x9F\x93\xA6"                                        // 📦
            "\xF0\x9F\x87\xBA" "\xF0\x9F\x87\xB8" "\xF0\x9F\x87\xA6"; // 🇺🇸🇦
 #else
     return "Hamburgefons";
 #endif
 }

 static bool extra_config_contains(const char* substring) {
     for (int index = 0; index < FLAGS_key.count(); index += 2) {
         if (0 == strcmp("extra_config", FLAGS_key[index])
                 && strstr(FLAGS_key[index + 1], substring)) {
             return true;
         }
     }
     return false;
 }

 const char* platform_font_manager() {
     if (extra_config_contains("GDI")) {
         return "GDI";
     }
     if (extra_config_contains("NativeFonts")){
         return platform_os_name();
     }
     return "";
 }


 const char* colortype_name(SkColorType ct) {
     switch (ct) {
         case kUnknown_SkColorType:      return "Unknown";
         case kAlpha_8_SkColorType:      return "Alpha_8";
         case kARGB_4444_SkColorType:    return "ARGB_4444";
         case kRGB_565_SkColorType:      return "RGB_565";
         case kRGBA_8888_SkColorType:    return "RGBA_8888";
         case kBGRA_8888_SkColorType:    return "BGRA_8888";
         case kRGBA_F16_SkColorType:     return "RGBA_F16";
         default:
             SkASSERT(false);
             return "unexpected colortype";
     }
 }

 SkColor color_to_565(SkColor color) {
     SkPMColor pmColor = SkPreMultiplyColor(color);
     U16CPU color16 = SkPixel32ToPixel16(pmColor);
     return SkPixel16ToColor(color16);
 }

 sk_sp<SkTypeface> create_portable_typeface(const char* name, SkFontStyle style) {
     return create_font(name, style);
 }

 void set_portable_typeface(SkPaint* paint, const char* name, SkFontStyle style) {
     paint->setTypeface(create_font(name, style));
 }

 void write_pixels(SkCanvas* canvas, const SkBitmap& bitmap, int x, int y,
                   SkColorType colorType, SkAlphaType alphaType) {
     SkBitmap tmp(bitmap);
     const SkImageInfo info = SkImageInfo::Make(tmp.width(), tmp.height(), colorType, alphaType);

     canvas->writePixels(info, tmp.getPixels(), tmp.rowBytes(), x, y);
 }

 sk_sp<SkShader> create_checkerboard_shader(SkColor c1, SkColor c2, int size) {
     SkBitmap bm;
     bm.allocPixels(SkImageInfo::MakeS32(2 * size, 2 * size, kPremul_SkAlphaType));
     bm.eraseColor(c1);
     bm.eraseArea(SkIRect::MakeLTRB(0, 0, size, size), c2);
     bm.eraseArea(SkIRect::MakeLTRB(size, size, 2 * size, 2 * size), c2);
     return SkShader::MakeBitmapShader(
             bm, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode);
 }

 SkBitmap create_checkerboard_bitmap(int w, int h, SkColor c1, SkColor c2, int checkSize) {
     SkBitmap bitmap;
     bitmap.allocPixels(SkImageInfo::MakeS32(w, h, kPremul_SkAlphaType));
     SkCanvas canvas(bitmap);

     sk_tool_utils::draw_checkerboard(&canvas, c1, c2, checkSize);
     return bitmap;
 }

 void draw_checkerboard(SkCanvas* canvas, SkColor c1, SkColor c2, int size) {
     SkPaint paint;
     paint.setShader(create_checkerboard_shader(c1, c2, size));
     paint.setBlendMode(SkBlendMode::kSrc);
     canvas->drawPaint(paint);
 }

 SkBitmap create_string_bitmap(int w, int h, SkColor c, int x, int y,
                               int textSize, const char* str) {
     SkBitmap bitmap;
     bitmap.allocN32Pixels(w, h);
     SkCanvas canvas(bitmap);

     SkPaint paint;
     paint.setAntiAlias(true);
     sk_tool_utils::set_portable_typeface(&paint);
     paint.setColor(c);
     paint.setTextSize(SkIntToScalar(textSize));

     canvas.clear(0x00000000);
     canvas.drawString(str, SkIntToScalar(x), SkIntToScalar(y), paint);

     // Tag data as sRGB (without doing any color space conversion). Color-space aware configs
     // will process this correctly but legacy configs will render as if this returned N32.
     SkBitmap result;
     result.setInfo(SkImageInfo::MakeS32(w, h, kPremul_SkAlphaType));
     result.setPixelRef(sk_ref_sp(bitmap.pixelRef()), 0, 0);
     return result;
 }

 void add_to_text_blob_w_len(SkTextBlobBuilder* builder, const char* text, size_t len,
                             const SkPaint& origPaint, SkScalar x, SkScalar y) {
     SkPaint paint(origPaint);
     SkTDArray<uint16_t> glyphs;

     glyphs.append(paint.textToGlyphs(text, len, nullptr));
     paint.textToGlyphs(text, len, glyphs.begin());

     paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
     const SkTextBlobBuilder::RunBuffer& run = builder->allocRun(paint, glyphs.count(), x, y,
                                                                 nullptr);
     memcpy(run.glyphs, glyphs.begin(), glyphs.count() * sizeof(uint16_t));
 }

 void add_to_text_blob(SkTextBlobBuilder* builder, const char* text,
                       const SkPaint& origPaint, SkScalar x, SkScalar y) {
     add_to_text_blob_w_len(builder, text, strlen(text), origPaint, x, y);
 }

 SkPath make_star(const SkRect& bounds, int numPts, int step) {
     SkPath path;
     path.setFillType(SkPath::kEvenOdd_FillType);
     path.moveTo(0,-1);
     for (int i = 1; i < numPts; ++i) {
         int idx = i*step;
         SkScalar theta = idx * 2*SK_ScalarPI/numPts + SK_ScalarPI/2;
         SkScalar x = SkScalarCos(theta);
         SkScalar y = -SkScalarSin(theta);
         path.lineTo(x, y);
     }
     path.transform(SkMatrix::MakeRectToRect(path.getBounds(), bounds, SkMatrix::kFill_ScaleToFit));
     return path;
 }

 #if !defined(__clang__) && defined(_MSC_VER)
     // MSVC takes ~2 minutes to compile this function with optimization.
     // We don't really care to wait that long for this function.
     #pragma optimize("", off)
 #endif
 void make_big_path(SkPath& path) {
     #include "BigPathBench.inc"
 }

 static float gaussian2d_value(int x, int y, float sigma) {
     // don't bother with the scale term since we're just going to normalize the
     // kernel anyways
     float temp = expf(-(x*x + y*y)/(2*sigma*sigma));
     return temp;
 }

 static float* create_2d_kernel(float sigma, int* filterSize) {
     // We will actually take 2*halfFilterSize+1 samples (i.e., our filter kernel
     // sizes are always odd)
     int halfFilterSize = SkScalarCeilToInt(6*sigma)/2;
     int wh = *filterSize = 2*halfFilterSize + 1;

     float* temp = new float[wh*wh];

     float filterTot = 0.0f;
     for (int yOff = 0; yOff < wh; ++yOff) {
         for (int xOff = 0; xOff < wh; ++xOff) {
             temp[yOff*wh+xOff] = gaussian2d_value(xOff-halfFilterSize, yOff-halfFilterSize, sigma);

             filterTot += temp[yOff*wh+xOff];
         }
     }

     // normalize the kernel
     for (int yOff = 0; yOff < wh; ++yOff) {
         for (int xOff = 0; xOff < wh; ++xOff) {
             temp[yOff*wh+xOff] /= filterTot;
         }
     }

     return temp;
 }

 static SkPMColor blur_pixel(const SkBitmap& bm, int x, int y, float* kernel, int wh) {
     SkASSERT(wh & 0x1);

     int halfFilterSize = (wh-1)/2;

     float r = 0.0f, g = 0.0f, b = 0.0f;
     for (int yOff = 0; yOff < wh; ++yOff) {
         int ySamp = y + yOff - halfFilterSize;

         if (ySamp < 0) {
             ySamp = 0;
         } else if (ySamp > bm.height()-1) {
             ySamp = bm.height()-1;
         }

         for (int xOff = 0; xOff < wh; ++xOff) {
             int xSamp = x + xOff - halfFilterSize;

             if (xSamp < 0) {
                 xSamp = 0;
             } else if (xSamp > bm.width()-1) {
                 xSamp = bm.width()-1;
             }

             float filter = kernel[yOff*wh + xOff];

             SkPMColor c = *bm.getAddr32(xSamp, ySamp);

             r += SkGetPackedR32(c) * filter;
             g += SkGetPackedG32(c) * filter;
             b += SkGetPackedB32(c) * filter;
         }
     }

     U8CPU r8, g8, b8;

     r8 = (U8CPU) (r+0.5f);
     g8 = (U8CPU) (g+0.5f);
     b8 = (U8CPU) (b+0.5f);

     return SkPackARGB32(255, r8, g8, b8);
 }

 SkBitmap slow_blur(const SkBitmap& src, float sigma) {
     SkBitmap dst;

     dst.allocN32Pixels(src.width(), src.height(), true);

     int wh;
     std::unique_ptr<float[]> kernel(create_2d_kernel(sigma, &wh));

     for (int y = 0; y < src.height(); ++y) {
         for (int x = 0; x < src.width(); ++x) {
             *dst.getAddr32(x, y) = blur_pixel(src, x, y, kernel.get(), wh);
         }
     }

     return dst;
 }

 // compute the intersection point between the diagonal and the ellipse in the
 // lower right corner
 static SkPoint intersection(SkScalar w, SkScalar h) {
     SkASSERT(w > 0.0f || h > 0.0f);

     return SkPoint::Make(w / SK_ScalarSqrt2, h / SK_ScalarSqrt2);
 }

 // Use the intersection of the corners' diagonals with their ellipses to shrink
 // the bounding rect
 SkRect compute_central_occluder(const SkRRect& rr) {
     const SkRect r = rr.getBounds();

     SkScalar newL = r.fLeft, newT = r.fTop, newR = r.fRight, newB = r.fBottom;

     SkVector radii = rr.radii(SkRRect::kUpperLeft_Corner);
     if (!radii.isZero()) {
         SkPoint p = intersection(radii.fX, radii.fY);

         newL = SkTMax(newL, r.fLeft + radii.fX - p.fX);
         newT = SkTMax(newT, r.fTop + radii.fY - p.fY);
     }

     radii = rr.radii(SkRRect::kUpperRight_Corner);
     if (!radii.isZero()) {
         SkPoint p = intersection(radii.fX, radii.fY);

         newR = SkTMin(newR, r.fRight + p.fX - radii.fX);
         newT = SkTMax(newT, r.fTop + radii.fY - p.fY);
     }

     radii = rr.radii(SkRRect::kLowerRight_Corner);
     if (!radii.isZero()) {
         SkPoint p = intersection(radii.fX, radii.fY);

         newR = SkTMin(newR, r.fRight + p.fX - radii.fX);
         newB = SkTMin(newB, r.fBottom - radii.fY + p.fY);
     }

     radii = rr.radii(SkRRect::kLowerLeft_Corner);
     if (!radii.isZero()) {
         SkPoint p = intersection(radii.fX, radii.fY);

         newL = SkTMax(newL, r.fLeft + radii.fX - p.fX);
         newB = SkTMin(newB, r.fBottom - radii.fY + p.fY);
     }

     return SkRect::MakeLTRB(newL, newT, newR, newB);
 }

 // The widest inset rect
 SkRect compute_widest_occluder(const SkRRect& rr) {
     const SkRect& r = rr.getBounds();

     const SkVector& ul = rr.radii(SkRRect::kUpperLeft_Corner);
     const SkVector& ur = rr.radii(SkRRect::kUpperRight_Corner);
     const SkVector& lr = rr.radii(SkRRect::kLowerRight_Corner);
     const SkVector& ll = rr.radii(SkRRect::kLowerLeft_Corner);

     SkScalar maxT = SkTMax(ul.fY, ur.fY);
     SkScalar maxB = SkTMax(ll.fY, lr.fY);

     return SkRect::MakeLTRB(r.fLeft, r.fTop + maxT, r.fRight, r.fBottom - maxB);

 }

 // The tallest inset rect
 SkRect compute_tallest_occluder(const SkRRect& rr) {
     const SkRect& r = rr.getBounds();

     const SkVector& ul = rr.radii(SkRRect::kUpperLeft_Corner);
     const SkVector& ur = rr.radii(SkRRect::kUpperRight_Corner);
     const SkVector& lr = rr.radii(SkRRect::kLowerRight_Corner);
     const SkVector& ll = rr.radii(SkRRect::kLowerLeft_Corner);

     SkScalar maxL = SkTMax(ul.fX, ll.fX);
     SkScalar maxR = SkTMax(ur.fX, lr.fX);

     return SkRect::MakeLTRB(r.fLeft + maxL, r.fTop, r.fRight - maxR, r.fBottom);
 }

 bool copy_to(SkBitmap* dst, SkColorType dstColorType, const SkBitmap& src) {
     SkPixmap srcPM;
     if (!src.peekPixels(&srcPM)) {
         return false;
     }

     SkBitmap tmpDst;
     SkImageInfo dstInfo = srcPM.info().makeColorType(dstColorType);
     if (!tmpDst.setInfo(dstInfo)) {
         return false;
     }

     if (!tmpDst.tryAllocPixels()) {
         return false;
     }

     SkPixmap dstPM;
     if (!tmpDst.peekPixels(&dstPM)) {
         return false;
     }

     if (!srcPM.readPixels(dstPM)) {
         return false;
     }

     dst->swap(tmpDst);
     return true;
 }

 void copy_to_g8(SkBitmap* dst, const SkBitmap& src) {
     SkASSERT(kBGRA_8888_SkColorType == src.colorType() ||
              kRGBA_8888_SkColorType == src.colorType());

     SkImageInfo grayInfo = src.info().makeColorType(kGray_8_SkColorType);
     dst->allocPixels(grayInfo);
     uint8_t* dst8 = (uint8_t*)dst->getPixels();
     const uint32_t* src32 = (const uint32_t*)src.getPixels();

     const int w = src.width();
     const int h = src.height();
     const bool isBGRA = (kBGRA_8888_SkColorType == src.colorType());
     for (int y = 0; y < h; ++y) {
         if (isBGRA) {
             // BGRA
             for (int x = 0; x < w; ++x) {
                 uint32_t s = src32[x];
                 dst8[x] = SkComputeLuminance((s >> 16) & 0xFF, (s >> 8) & 0xFF, s & 0xFF);
             }
         } else {
             // RGBA
             for (int x = 0; x < w; ++x) {
                 uint32_t s = src32[x];
                 dst8[x] = SkComputeLuminance(s & 0xFF, (s >> 8) & 0xFF, (s >> 16) & 0xFF);
             }
         }
         src32 = (const uint32_t*)((const char*)src32 + src.rowBytes());
         dst8 += dst->rowBytes();
     }
 }

     //////////////////////////////////////////////////////////////////////////////////////////////

     static int scale255(float x) {
         return sk_float_round2int(x * 255);
     }

     static unsigned diff(const SkColorType ct, const void* a, const void* b) {
         int dr = 0,
             dg = 0,
             db = 0,
             da = 0;
         switch (ct) {
             case kRGBA_8888_SkColorType:
             case kBGRA_8888_SkColorType: {
                 SkPMColor c0 = *(const SkPMColor*)a;
                 SkPMColor c1 = *(const SkPMColor*)b;
                 dr = SkGetPackedR32(c0) - SkGetPackedR32(c1);
                 dg = SkGetPackedG32(c0) - SkGetPackedG32(c1);
                 db = SkGetPackedB32(c0) - SkGetPackedB32(c1);
                 da = SkGetPackedA32(c0) - SkGetPackedA32(c1);
             } break;
             case kRGB_565_SkColorType: {
                 uint16_t c0 = *(const uint16_t*)a;
                 uint16_t c1 = *(const uint16_t*)b;
                 dr = SkGetPackedR16(c0) - SkGetPackedR16(c1);
                 dg = SkGetPackedG16(c0) - SkGetPackedG16(c1);
                 db = SkGetPackedB16(c0) - SkGetPackedB16(c1);
             } break;
             case kARGB_4444_SkColorType: {
                 uint16_t c0 = *(const uint16_t*)a;
                 uint16_t c1 = *(const uint16_t*)b;
                 dr = SkGetPackedR4444(c0) - SkGetPackedR4444(c1);
                 dg = SkGetPackedG4444(c0) - SkGetPackedG4444(c1);
                 db = SkGetPackedB4444(c0) - SkGetPackedB4444(c1);
                 da = SkGetPackedA4444(c0) - SkGetPackedA4444(c1);
             } break;
             case kAlpha_8_SkColorType:
             case kGray_8_SkColorType:
                 da = (const uint8_t*)a - (const uint8_t*)b;
                 break;
             case kRGBA_F16_SkColorType: {
                 const SkPM4f* c0 = (const SkPM4f*)a;
                 const SkPM4f* c1 = (const SkPM4f*)b;
                 dr = scale255(c0->r() - c1->r());
                 dg = scale255(c0->g() - c1->g());
                 db = scale255(c0->b() - c1->b());
                 da = scale255(c0->a() - c1->a());
             } break;
             default:
                 return 0;
         }
         dr = SkAbs32(dr);
         dg = SkAbs32(dg);
         db = SkAbs32(db);
         da = SkAbs32(da);
         return SkMax32(dr, SkMax32(dg, SkMax32(db, da)));
     }

     bool equal_pixels(const SkPixmap& a, const SkPixmap& b, unsigned maxDiff,
                       bool respectColorSpace) {
         if (a.width() != b.width() ||
             a.height() != b.height() ||
             a.colorType() != b.colorType() ||
             (respectColorSpace && (a.colorSpace() != b.colorSpace())))
         {
             return false;
         }

         for (int y = 0; y < a.height(); ++y) {
             const char* aptr = (const char*)a.addr(0, y);
             const char* bptr = (const char*)b.addr(0, y);
             if (memcmp(aptr, bptr, a.width() * a.info().bytesPerPixel())) {
                 for (int x = 0; x < a.width(); ++x) {
                     if (diff(a.colorType(), a.addr(x, y), b.addr(x, y)) > maxDiff) {
                         return false;
                     }
                 }
             }
             aptr += a.rowBytes();
             bptr += b.rowBytes();
         }
         return true;
     }

     bool equal_pixels(const SkBitmap& bm0, const SkBitmap& bm1, unsigned maxDiff,
                       bool respectColorSpaces) {
         SkPixmap pm0, pm1;
         return bm0.peekPixels(&pm0) && bm1.peekPixels(&pm1) &&
                equal_pixels(pm0, pm1, maxDiff, respectColorSpaces);
     }

     bool equal_pixels(const SkImage* a, const SkImage* b, unsigned maxDiff,
                       bool respectColorSpaces) {
         // ensure that peekPixels will succeed
         auto imga = a->makeRasterImage();
         auto imgb = b->makeRasterImage();
         a = imga.get();
         b = imgb.get();

         SkPixmap pm0, pm1;
         return a->peekPixels(&pm0) && b->peekPixels(&pm1) &&
                equal_pixels(pm0, pm1, maxDiff, respectColorSpaces);
     }

     sk_sp<SkSurface> makeSurface(SkCanvas* canvas, const SkImageInfo& info,
                                  const SkSurfaceProps* props) {
         auto surf = canvas->makeSurface(info, props);
         if (!surf) {
             surf = SkSurface::MakeRaster(info, props);
         }
         return surf;
     }
 }  // namespace sk_tool_utils
	/*
	* Copyright 2014 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "sk_tool_utils.h"

	#include "Resources.h"
	#include "SkBitmap.h"
	#include "SkCanvas.h"
	#include "SkCommonFlags.h"
	#include "SkFontMgr.h"
	#include "SkFontStyle.h"
	#include "SkImage.h"
	#include "SkPixelRef.h"
	#include "SkPM4f.h"
	#include "SkPoint3.h"
	#include "SkShader.h"
	#include "SkSurface.h"
	#include "SkTestScalerContext.h"
	#include "SkTextBlob.h"

	namespace sk_tool_utils {

	static const char* platform_os_name() {
	for (int index = 0; index < FLAGS_key.count(); index += 2) {
	if (!strcmp("os", FLAGS_key[index])) {
	return FLAGS_key[index + 1];
	}
	}
	return "";
	}

	sk_sp<SkTypeface> emoji_typeface() {
	#if defined(SK_BUILD_FOR_WIN)
	sk_sp<SkFontMgr> fm(SkFontMgr::RefDefault());
	const char *colorEmojiFontName = "Segoe UI Emoji";
	sk_sp<SkTypeface> typeface(fm->matchFamilyStyle(colorEmojiFontName, SkFontStyle()));
	if (typeface) {
	return typeface;
	}
	sk_sp<SkTypeface> fallback(fm->matchFamilyStyleCharacter(
	colorEmojiFontName, SkFontStyle(), nullptr /* bcp47 /, 0 / bcp47Count */,
	0x1f4b0 /* character: 💰 */));
	if (fallback) {
	return fallback;
	}
	// If we don't have Segoe UI Emoji and can't find a fallback, try Segoe UI Symbol.
	// Windows 7 does not have Segoe UI Emoji; Segoe UI Symbol has the (non - color) emoji.
	return SkTypeface::MakeFromName("Segoe UI Symbol", SkFontStyle());

	#elif defined(SK_BUILD_FOR_MAC) \|\| defined(SK_BUILD_FOR_IOS)
	return SkTypeface::MakeFromName("Apple Color Emoji", SkFontStyle());

	#else
	return MakeResourceAsTypeface("fonts/Funkster.ttf");

	#endif
	}

	const char* emoji_sample_text() {
	#if defined(SK_BUILD_FOR_WIN) \|\| defined(SK_BUILD_FOR_MAC) \|\| defined(SK_BUILD_FOR_IOS)
	return "\xF0\x9F\x92\xB0" "\xF0\x9F\x8F\xA1" "\xF0\x9F\x8E\x85" // 💰🏡🎅
	"\xF0\x9F\x8D\xAA" "\xF0\x9F\x8D\x95" "\xF0\x9F\x9A\x80" // 🍪🍕🚀
	"\xF0\x9F\x9A\xBB" "\xF0\x9F\x92\xA9" "\xF0\x9F\x93\xB7" // 🚻💩📷
	"\xF0\x9F\x93\xA6" // 📦
	"\xF0\x9F\x87\xBA" "\xF0\x9F\x87\xB8" "\xF0\x9F\x87\xA6"; // 🇺🇸🇦
	#else
	return "Hamburgefons";
	#endif
	}

	static bool extra_config_contains(const char* substring) {
	for (int index = 0; index < FLAGS_key.count(); index += 2) {
	if (0 == strcmp("extra_config", FLAGS_key[index])
	&& strstr(FLAGS_key[index + 1], substring)) {
	return true;
	}
	}
	return false;
	}

	const char* platform_font_manager() {
	if (extra_config_contains("GDI")) {
	return "GDI";
	}
	if (extra_config_contains("NativeFonts")){
	return platform_os_name();
	}
	return "";
	}


	const char* colortype_name(SkColorType ct) {
	switch (ct) {
	case kUnknown_SkColorType: return "Unknown";
	case kAlpha_8_SkColorType: return "Alpha_8";
	case kARGB_4444_SkColorType: return "ARGB_4444";
	case kRGB_565_SkColorType: return "RGB_565";
	case kRGBA_8888_SkColorType: return "RGBA_8888";
	case kBGRA_8888_SkColorType: return "BGRA_8888";
	case kRGBA_F16_SkColorType: return "RGBA_F16";
	default:
	SkASSERT(false);
	return "unexpected colortype";
	}
	}

	SkColor color_to_565(SkColor color) {
	SkPMColor pmColor = SkPreMultiplyColor(color);
	U16CPU color16 = SkPixel32ToPixel16(pmColor);
	return SkPixel16ToColor(color16);
	}

	sk_sp<SkTypeface> create_portable_typeface(const char* name, SkFontStyle style) {
	return create_font(name, style);
	}

	void set_portable_typeface(SkPaint* paint, const char* name, SkFontStyle style) {
	paint->setTypeface(create_font(name, style));
	}

	void write_pixels(SkCanvas* canvas, const SkBitmap& bitmap, int x, int y,
	SkColorType colorType, SkAlphaType alphaType) {
	SkBitmap tmp(bitmap);
	const SkImageInfo info = SkImageInfo::Make(tmp.width(), tmp.height(), colorType, alphaType);

	canvas->writePixels(info, tmp.getPixels(), tmp.rowBytes(), x, y);
	}

	sk_sp<SkShader> create_checkerboard_shader(SkColor c1, SkColor c2, int size) {
	SkBitmap bm;
	bm.allocPixels(SkImageInfo::MakeS32(2 * size, 2 * size, kPremul_SkAlphaType));
	bm.eraseColor(c1);
	bm.eraseArea(SkIRect::MakeLTRB(0, 0, size, size), c2);
	bm.eraseArea(SkIRect::MakeLTRB(size, size, 2 * size, 2 * size), c2);
	return SkShader::MakeBitmapShader(
	bm, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode);
	}

	SkBitmap create_checkerboard_bitmap(int w, int h, SkColor c1, SkColor c2, int checkSize) {
	SkBitmap bitmap;
	bitmap.allocPixels(SkImageInfo::MakeS32(w, h, kPremul_SkAlphaType));
	SkCanvas canvas(bitmap);

	sk_tool_utils::draw_checkerboard(&canvas, c1, c2, checkSize);
	return bitmap;
	}

	void draw_checkerboard(SkCanvas* canvas, SkColor c1, SkColor c2, int size) {
	SkPaint paint;
	paint.setShader(create_checkerboard_shader(c1, c2, size));
	paint.setBlendMode(SkBlendMode::kSrc);
	canvas->drawPaint(paint);
	}

	SkBitmap create_string_bitmap(int w, int h, SkColor c, int x, int y,
	int textSize, const char* str) {
	SkBitmap bitmap;
	bitmap.allocN32Pixels(w, h);
	SkCanvas canvas(bitmap);

	SkPaint paint;
	paint.setAntiAlias(true);
	sk_tool_utils::set_portable_typeface(&paint);
	paint.setColor(c);
	paint.setTextSize(SkIntToScalar(textSize));

	canvas.clear(0x00000000);
	canvas.drawString(str, SkIntToScalar(x), SkIntToScalar(y), paint);

	// Tag data as sRGB (without doing any color space conversion). Color-space aware configs
	// will process this correctly but legacy configs will render as if this returned N32.
	SkBitmap result;
	result.setInfo(SkImageInfo::MakeS32(w, h, kPremul_SkAlphaType));
	result.setPixelRef(sk_ref_sp(bitmap.pixelRef()), 0, 0);
	return result;
	}

	void add_to_text_blob_w_len(SkTextBlobBuilder* builder, const char* text, size_t len,
	const SkPaint& origPaint, SkScalar x, SkScalar y) {
	SkPaint paint(origPaint);
	SkTDArray<uint16_t> glyphs;

	glyphs.append(paint.textToGlyphs(text, len, nullptr));
	paint.textToGlyphs(text, len, glyphs.begin());

	paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
	const SkTextBlobBuilder::RunBuffer& run = builder->allocRun(paint, glyphs.count(), x, y,
	nullptr);
	memcpy(run.glyphs, glyphs.begin(), glyphs.count() * sizeof(uint16_t));
	}

	void add_to_text_blob(SkTextBlobBuilder* builder, const char* text,
	const SkPaint& origPaint, SkScalar x, SkScalar y) {
	add_to_text_blob_w_len(builder, text, strlen(text), origPaint, x, y);
	}

	SkPath make_star(const SkRect& bounds, int numPts, int step) {
	SkPath path;
	path.setFillType(SkPath::kEvenOdd_FillType);
	path.moveTo(0,-1);
	for (int i = 1; i < numPts; ++i) {
	int idx = i*step;
	SkScalar theta = idx * 2*SK_ScalarPI/numPts + SK_ScalarPI/2;
	SkScalar x = SkScalarCos(theta);
	SkScalar y = -SkScalarSin(theta);
	path.lineTo(x, y);
	}
	path.transform(SkMatrix::MakeRectToRect(path.getBounds(), bounds, SkMatrix::kFill_ScaleToFit));
	return path;
	}

	#if !defined(__clang__) && defined(_MSC_VER)
	// MSVC takes ~2 minutes to compile this function with optimization.
	// We don't really care to wait that long for this function.
	#pragma optimize("", off)
	#endif
	void make_big_path(SkPath& path) {
	#include "BigPathBench.inc"
	}

	static float gaussian2d_value(int x, int y, float sigma) {
	// don't bother with the scale term since we're just going to normalize the
	// kernel anyways
	float temp = expf(-(xx + yy)/(2sigmasigma));
	return temp;
	}

	static float* create_2d_kernel(float sigma, int* filterSize) {
	// We will actually take 2*halfFilterSize+1 samples (i.e., our filter kernel
	// sizes are always odd)
	int halfFilterSize = SkScalarCeilToInt(6*sigma)/2;
	int wh = filterSize = 2halfFilterSize + 1;

	float* temp = new float[wh*wh];

	float filterTot = 0.0f;
	for (int yOff = 0; yOff < wh; ++yOff) {
	for (int xOff = 0; xOff < wh; ++xOff) {
	temp[yOff*wh+xOff] = gaussian2d_value(xOff-halfFilterSize, yOff-halfFilterSize, sigma);

	filterTot += temp[yOff*wh+xOff];
	}
	}

	// normalize the kernel
	for (int yOff = 0; yOff < wh; ++yOff) {
	for (int xOff = 0; xOff < wh; ++xOff) {
	temp[yOff*wh+xOff] /= filterTot;
	}
	}

	return temp;
	}

	static SkPMColor blur_pixel(const SkBitmap& bm, int x, int y, float* kernel, int wh) {
	SkASSERT(wh & 0x1);

	int halfFilterSize = (wh-1)/2;

	float r = 0.0f, g = 0.0f, b = 0.0f;
	for (int yOff = 0; yOff < wh; ++yOff) {
	int ySamp = y + yOff - halfFilterSize;

	if (ySamp < 0) {
	ySamp = 0;
	} else if (ySamp > bm.height()-1) {
	ySamp = bm.height()-1;
	}

	for (int xOff = 0; xOff < wh; ++xOff) {
	int xSamp = x + xOff - halfFilterSize;

	if (xSamp < 0) {
	xSamp = 0;
	} else if (xSamp > bm.width()-1) {
	xSamp = bm.width()-1;
	}

	float filter = kernel[yOff*wh + xOff];

	SkPMColor c = *bm.getAddr32(xSamp, ySamp);

	r += SkGetPackedR32(c) * filter;
	g += SkGetPackedG32(c) * filter;
	b += SkGetPackedB32(c) * filter;
	}
	}

	U8CPU r8, g8, b8;

	r8 = (U8CPU) (r+0.5f);
	g8 = (U8CPU) (g+0.5f);
	b8 = (U8CPU) (b+0.5f);

	return SkPackARGB32(255, r8, g8, b8);
	}

	SkBitmap slow_blur(const SkBitmap& src, float sigma) {
	SkBitmap dst;

	dst.allocN32Pixels(src.width(), src.height(), true);

	int wh;
	std::unique_ptr<float[]> kernel(create_2d_kernel(sigma, &wh));

	for (int y = 0; y < src.height(); ++y) {
	for (int x = 0; x < src.width(); ++x) {
	*dst.getAddr32(x, y) = blur_pixel(src, x, y, kernel.get(), wh);
	}
	}

	return dst;
	}

	// compute the intersection point between the diagonal and the ellipse in the
	// lower right corner
	static SkPoint intersection(SkScalar w, SkScalar h) {
	SkASSERT(w > 0.0f \|\| h > 0.0f);

	return SkPoint::Make(w / SK_ScalarSqrt2, h / SK_ScalarSqrt2);
	}

	// Use the intersection of the corners' diagonals with their ellipses to shrink
	// the bounding rect
	SkRect compute_central_occluder(const SkRRect& rr) {
	const SkRect r = rr.getBounds();

	SkScalar newL = r.fLeft, newT = r.fTop, newR = r.fRight, newB = r.fBottom;

	SkVector radii = rr.radii(SkRRect::kUpperLeft_Corner);
	if (!radii.isZero()) {
	SkPoint p = intersection(radii.fX, radii.fY);

	newL = SkTMax(newL, r.fLeft + radii.fX - p.fX);
	newT = SkTMax(newT, r.fTop + radii.fY - p.fY);
	}

	radii = rr.radii(SkRRect::kUpperRight_Corner);
	if (!radii.isZero()) {
	SkPoint p = intersection(radii.fX, radii.fY);

	newR = SkTMin(newR, r.fRight + p.fX - radii.fX);
	newT = SkTMax(newT, r.fTop + radii.fY - p.fY);
	}

	radii = rr.radii(SkRRect::kLowerRight_Corner);
	if (!radii.isZero()) {
	SkPoint p = intersection(radii.fX, radii.fY);

	newR = SkTMin(newR, r.fRight + p.fX - radii.fX);
	newB = SkTMin(newB, r.fBottom - radii.fY + p.fY);
	}

	radii = rr.radii(SkRRect::kLowerLeft_Corner);
	if (!radii.isZero()) {
	SkPoint p = intersection(radii.fX, radii.fY);

	newL = SkTMax(newL, r.fLeft + radii.fX - p.fX);
	newB = SkTMin(newB, r.fBottom - radii.fY + p.fY);
	}

	return SkRect::MakeLTRB(newL, newT, newR, newB);
	}

	// The widest inset rect
	SkRect compute_widest_occluder(const SkRRect& rr) {
	const SkRect& r = rr.getBounds();

	const SkVector& ul = rr.radii(SkRRect::kUpperLeft_Corner);
	const SkVector& ur = rr.radii(SkRRect::kUpperRight_Corner);
	const SkVector& lr = rr.radii(SkRRect::kLowerRight_Corner);
	const SkVector& ll = rr.radii(SkRRect::kLowerLeft_Corner);

	SkScalar maxT = SkTMax(ul.fY, ur.fY);
	SkScalar maxB = SkTMax(ll.fY, lr.fY);

	return SkRect::MakeLTRB(r.fLeft, r.fTop + maxT, r.fRight, r.fBottom - maxB);

	}

	// The tallest inset rect
	SkRect compute_tallest_occluder(const SkRRect& rr) {
	const SkRect& r = rr.getBounds();

	const SkVector& ul = rr.radii(SkRRect::kUpperLeft_Corner);
	const SkVector& ur = rr.radii(SkRRect::kUpperRight_Corner);
	const SkVector& lr = rr.radii(SkRRect::kLowerRight_Corner);
	const SkVector& ll = rr.radii(SkRRect::kLowerLeft_Corner);

	SkScalar maxL = SkTMax(ul.fX, ll.fX);
	SkScalar maxR = SkTMax(ur.fX, lr.fX);

	return SkRect::MakeLTRB(r.fLeft + maxL, r.fTop, r.fRight - maxR, r.fBottom);
	}

	bool copy_to(SkBitmap* dst, SkColorType dstColorType, const SkBitmap& src) {
	SkPixmap srcPM;
	if (!src.peekPixels(&srcPM)) {
	return false;
	}

	SkBitmap tmpDst;
	SkImageInfo dstInfo = srcPM.info().makeColorType(dstColorType);
	if (!tmpDst.setInfo(dstInfo)) {
	return false;
	}

	if (!tmpDst.tryAllocPixels()) {
	return false;
	}

	SkPixmap dstPM;
	if (!tmpDst.peekPixels(&dstPM)) {
	return false;
	}

	if (!srcPM.readPixels(dstPM)) {
	return false;
	}

	dst->swap(tmpDst);
	return true;
	}

	void copy_to_g8(SkBitmap* dst, const SkBitmap& src) {
	SkASSERT(kBGRA_8888_SkColorType == src.colorType() \|\|
	kRGBA_8888_SkColorType == src.colorType());

	SkImageInfo grayInfo = src.info().makeColorType(kGray_8_SkColorType);
	dst->allocPixels(grayInfo);
	uint8_t* dst8 = (uint8_t*)dst->getPixels();
	const uint32_t* src32 = (const uint32_t*)src.getPixels();

	const int w = src.width();
	const int h = src.height();
	const bool isBGRA = (kBGRA_8888_SkColorType == src.colorType());
	for (int y = 0; y < h; ++y) {
	if (isBGRA) {
	// BGRA
	for (int x = 0; x < w; ++x) {
	uint32_t s = src32[x];
	dst8[x] = SkComputeLuminance((s >> 16) & 0xFF, (s >> 8) & 0xFF, s & 0xFF);
	}
	} else {
	// RGBA
	for (int x = 0; x < w; ++x) {
	uint32_t s = src32[x];
	dst8[x] = SkComputeLuminance(s & 0xFF, (s >> 8) & 0xFF, (s >> 16) & 0xFF);
	}
	}
	src32 = (const uint32_t)((const char)src32 + src.rowBytes());
	dst8 += dst->rowBytes();
	}
	}

	//////////////////////////////////////////////////////////////////////////////////////////////

	static int scale255(float x) {
	return sk_float_round2int(x * 255);
	}

	static unsigned diff(const SkColorType ct, const void* a, const void* b) {
	int dr = 0,
	dg = 0,
	db = 0,
	da = 0;
	switch (ct) {
	case kRGBA_8888_SkColorType:
	case kBGRA_8888_SkColorType: {
	SkPMColor c0 = (const SkPMColor)a;
	SkPMColor c1 = (const SkPMColor)b;
	dr = SkGetPackedR32(c0) - SkGetPackedR32(c1);
	dg = SkGetPackedG32(c0) - SkGetPackedG32(c1);
	db = SkGetPackedB32(c0) - SkGetPackedB32(c1);
	da = SkGetPackedA32(c0) - SkGetPackedA32(c1);
	} break;
	case kRGB_565_SkColorType: {
	uint16_t c0 = (const uint16_t)a;
	uint16_t c1 = (const uint16_t)b;
	dr = SkGetPackedR16(c0) - SkGetPackedR16(c1);
	dg = SkGetPackedG16(c0) - SkGetPackedG16(c1);
	db = SkGetPackedB16(c0) - SkGetPackedB16(c1);
	} break;
	case kARGB_4444_SkColorType: {
	uint16_t c0 = (const uint16_t)a;
	uint16_t c1 = (const uint16_t)b;
	dr = SkGetPackedR4444(c0) - SkGetPackedR4444(c1);
	dg = SkGetPackedG4444(c0) - SkGetPackedG4444(c1);
	db = SkGetPackedB4444(c0) - SkGetPackedB4444(c1);
	da = SkGetPackedA4444(c0) - SkGetPackedA4444(c1);
	} break;
	case kAlpha_8_SkColorType:
	case kGray_8_SkColorType:
	da = (const uint8_t)a - (const uint8_t)b;
	break;
	case kRGBA_F16_SkColorType: {
	const SkPM4f* c0 = (const SkPM4f*)a;
	const SkPM4f* c1 = (const SkPM4f*)b;
	dr = scale255(c0->r() - c1->r());
	dg = scale255(c0->g() - c1->g());
	db = scale255(c0->b() - c1->b());
	da = scale255(c0->a() - c1->a());
	} break;
	default:
	return 0;
	}
	dr = SkAbs32(dr);
	dg = SkAbs32(dg);
	db = SkAbs32(db);
	da = SkAbs32(da);
	return SkMax32(dr, SkMax32(dg, SkMax32(db, da)));
	}

	bool equal_pixels(const SkPixmap& a, const SkPixmap& b, unsigned maxDiff,
	bool respectColorSpace) {
	if (a.width() != b.width() \|\|
	a.height() != b.height() \|\|
	a.colorType() != b.colorType() \|\|
	(respectColorSpace && (a.colorSpace() != b.colorSpace())))
	{
	return false;
	}

	for (int y = 0; y < a.height(); ++y) {
	const char* aptr = (const char*)a.addr(0, y);
	const char* bptr = (const char*)b.addr(0, y);
	if (memcmp(aptr, bptr, a.width() * a.info().bytesPerPixel())) {
	for (int x = 0; x < a.width(); ++x) {
	if (diff(a.colorType(), a.addr(x, y), b.addr(x, y)) > maxDiff) {
	return false;
	}
	}
	}
	aptr += a.rowBytes();
	bptr += b.rowBytes();
	}
	return true;
	}

	bool equal_pixels(const SkBitmap& bm0, const SkBitmap& bm1, unsigned maxDiff,
	bool respectColorSpaces) {
	SkPixmap pm0, pm1;
	return bm0.peekPixels(&pm0) && bm1.peekPixels(&pm1) &&
	equal_pixels(pm0, pm1, maxDiff, respectColorSpaces);
	}

	bool equal_pixels(const SkImage* a, const SkImage* b, unsigned maxDiff,
	bool respectColorSpaces) {
	// ensure that peekPixels will succeed
	auto imga = a->makeRasterImage();
	auto imgb = b->makeRasterImage();
	a = imga.get();
	b = imgb.get();

	SkPixmap pm0, pm1;
	return a->peekPixels(&pm0) && b->peekPixels(&pm1) &&
	equal_pixels(pm0, pm1, maxDiff, respectColorSpaces);
	}

	sk_sp<SkSurface> makeSurface(SkCanvas* canvas, const SkImageInfo& info,
	const SkSurfaceProps* props) {
	auto surf = canvas->makeSurface(info, props);
	if (!surf) {
	surf = SkSurface::MakeRaster(info, props);
	}
	return surf;
	}
	} // namespace sk_tool_utils