tests/BitmapCopyTest.cpp - platform/external/skia - Gitiles

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "Test.h"
 #include "SkBitmap.h"
 #include "SkRect.h"

 static const char* boolStr(bool value) {
     return value ? "true" : "false";
 }

 // these are in the same order as the SkBitmap::Config enum
 static const char* gConfigName[] = {
     "None", "A8", "Index8", "565", "4444", "8888"
 };

 static void report_opaqueness(skiatest::Reporter* reporter, const SkBitmap& src,
                               const SkBitmap& dst) {
     ERRORF(reporter, "src %s opaque:%d, dst %s opaque:%d",
            gConfigName[src.config()], src.isOpaque(),
            gConfigName[dst.config()], dst.isOpaque());
 }

 static bool canHaveAlpha(SkBitmap::Config config) {
     return config != SkBitmap::kRGB_565_Config;
 }

 // copyTo() should preserve isOpaque when it makes sense
 static void test_isOpaque(skiatest::Reporter* reporter,
                           const SkBitmap& srcOpaque, const SkBitmap& srcPremul,
                           SkBitmap::Config dstConfig) {
     SkBitmap dst;

     if (canHaveAlpha(srcPremul.config()) && canHaveAlpha(dstConfig)) {
         REPORTER_ASSERT(reporter, srcPremul.copyTo(&dst, dstConfig));
         REPORTER_ASSERT(reporter, dst.config() == dstConfig);
         if (srcPremul.isOpaque() != dst.isOpaque()) {
             report_opaqueness(reporter, srcPremul, dst);
         }
     }

     REPORTER_ASSERT(reporter, srcOpaque.copyTo(&dst, dstConfig));
     REPORTER_ASSERT(reporter, dst.config() == dstConfig);
     if (srcOpaque.isOpaque() != dst.isOpaque()) {
         report_opaqueness(reporter, srcOpaque, dst);
     }
 }

 static void init_src(const SkBitmap& bitmap) {
     SkAutoLockPixels lock(bitmap);
     if (bitmap.getPixels()) {
         if (bitmap.getColorTable()) {
             sk_bzero(bitmap.getPixels(), bitmap.getSize());
         } else {
             bitmap.eraseColor(SK_ColorWHITE);
         }
     }
 }

 static SkColorTable* init_ctable(SkAlphaType alphaType) {
     static const SkColor colors[] = {
         SK_ColorBLACK, SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE
     };
     return new SkColorTable(colors, SK_ARRAY_COUNT(colors), alphaType);
 }

 struct Pair {
     SkBitmap::Config    fConfig;
     const char*         fValid;
 };

 // Utility functions for copyPixelsTo()/copyPixelsFrom() tests.
 // getPixel()
 // setPixel()
 // getSkConfigName()
 // struct Coordinates
 // reportCopyVerification()
 // writeCoordPixels()

 // Utility function to read the value of a given pixel in bm. All
 // values converted to uint32_t for simplification of comparisons.
 static uint32_t getPixel(int x, int y, const SkBitmap& bm) {
     uint32_t val = 0;
     uint16_t val16;
     uint8_t val8;
     SkAutoLockPixels lock(bm);
     const void* rawAddr = bm.getAddr(x,y);

     switch (bm.config()) {
         case SkBitmap::kARGB_8888_Config:
             memcpy(&val, rawAddr, sizeof(uint32_t));
             break;
         case SkBitmap::kARGB_4444_Config:
         case SkBitmap::kRGB_565_Config:
             memcpy(&val16, rawAddr, sizeof(uint16_t));
             val = val16;
             break;
         case SkBitmap::kA8_Config:
         case SkBitmap::kIndex8_Config:
             memcpy(&val8, rawAddr, sizeof(uint8_t));
             val = val8;
             break;
         default:
             break;
     }
     return val;
 }

 // Utility function to set value of any pixel in bm.
 // bm.getConfig() specifies what format 'val' must be
 // converted to, but at present uint32_t can handle all formats.
 static void setPixel(int x, int y, uint32_t val, SkBitmap& bm) {
     uint16_t val16;
     uint8_t val8;
     SkAutoLockPixels lock(bm);
     void* rawAddr = bm.getAddr(x,y);

     switch (bm.config()) {
         case SkBitmap::kARGB_8888_Config:
             memcpy(rawAddr, &val, sizeof(uint32_t));
             break;
         case SkBitmap::kARGB_4444_Config:
         case SkBitmap::kRGB_565_Config:
             val16 = val & 0xFFFF;
             memcpy(rawAddr, &val16, sizeof(uint16_t));
             break;
         case SkBitmap::kA8_Config:
         case SkBitmap::kIndex8_Config:
             val8 = val & 0xFF;
             memcpy(rawAddr, &val8, sizeof(uint8_t));
             break;
         default:
             // Ignore.
             break;
     }
 }

 // Utility to return string containing name of each format, to
 // simplify diagnostic output.
 static const char* getSkConfigName(const SkBitmap& bm) {
     switch (bm.config()) {
         case SkBitmap::kNo_Config: return "SkBitmap::kNo_Config";
         case SkBitmap::kA8_Config: return "SkBitmap::kA8_Config";
         case SkBitmap::kIndex8_Config: return "SkBitmap::kIndex8_Config";
         case SkBitmap::kRGB_565_Config: return "SkBitmap::kRGB_565_Config";
         case SkBitmap::kARGB_4444_Config: return "SkBitmap::kARGB_4444_Config";
         case SkBitmap::kARGB_8888_Config: return "SkBitmap::kARGB_8888_Config";
         default: return "Unknown SkBitmap configuration.";
     }
 }

 // Helper struct to contain pixel locations, while avoiding need for STL.
 struct Coordinates {

     const int length;
     SkIPoint* const data;

     explicit Coordinates(int _length): length(_length)
                                      , data(new SkIPoint[length]) { }

     ~Coordinates(){
         delete [] data;
     }

     SkIPoint* operator[](int i) const {
         // Use with care, no bounds checking.
         return data + i;
     }
 };

 // A function to verify that two bitmaps contain the same pixel values
 // at all coordinates indicated by coords. Simplifies verification of
 // copied bitmaps.
 static void reportCopyVerification(const SkBitmap& bm1, const SkBitmap& bm2,
                             Coordinates& coords,
                             const char* msg,
                             skiatest::Reporter* reporter){
     bool success = true;

     // Confirm all pixels in the list match.
     for (int i = 0; i < coords.length; ++i) {
         success = success &&
                   (getPixel(coords[i]->fX, coords[i]->fY, bm1) ==
                    getPixel(coords[i]->fX, coords[i]->fY, bm2));
     }

     if (!success) {
         ERRORF(reporter, "%s [config = %s]", msg, getSkConfigName(bm1));
     }
 }

 // Writes unique pixel values at locations specified by coords.
 static void writeCoordPixels(SkBitmap& bm, const Coordinates& coords) {
     for (int i = 0; i < coords.length; ++i)
         setPixel(coords[i]->fX, coords[i]->fY, i, bm);
 }

 static const Pair gPairs[] = {
     { SkBitmap::kNo_Config,         "0000000"  },
     { SkBitmap::kA8_Config,         "0101010"  },
     { SkBitmap::kIndex8_Config,     "0111010"  },
     { SkBitmap::kRGB_565_Config,    "0101010"  },
     { SkBitmap::kARGB_4444_Config,  "0101110"  },
     { SkBitmap::kARGB_8888_Config,  "0101110"  },
 };

 static const int W = 20;
 static const int H = 33;

 static void setup_src_bitmaps(SkBitmap* srcOpaque, SkBitmap* srcPremul,
                               SkBitmap::Config config) {
     SkColorTable* ctOpaque = NULL;
     SkColorTable* ctPremul = NULL;

     srcOpaque->setConfig(config, W, H, 0, kOpaque_SkAlphaType);
     srcPremul->setConfig(config, W, H, 0, kPremul_SkAlphaType);
     if (SkBitmap::kIndex8_Config == config) {
         ctOpaque = init_ctable(kOpaque_SkAlphaType);
         ctPremul = init_ctable(kPremul_SkAlphaType);
     }
     srcOpaque->allocPixels(ctOpaque);
     srcPremul->allocPixels(ctPremul);
     SkSafeUnref(ctOpaque);
     SkSafeUnref(ctPremul);
     init_src(*srcOpaque);
     init_src(*srcPremul);
 }

 DEF_TEST(BitmapCopy_extractSubset, reporter) {
     for (size_t i = 0; i < SK_ARRAY_COUNT(gPairs); i++) {
         SkBitmap srcOpaque, srcPremul;
         setup_src_bitmaps(&srcOpaque, &srcPremul, gPairs[i].fConfig);

         SkBitmap bitmap(srcOpaque);
         SkBitmap subset;
         SkIRect r;
         // Extract a subset which has the same width as the original. This
         // catches a bug where we cloned the genID incorrectly.
         r.set(0, 1, W, 3);
         bitmap.setIsVolatile(true);
         if (bitmap.extractSubset(&subset, r)) {
             REPORTER_ASSERT(reporter, subset.width() == W);
             REPORTER_ASSERT(reporter, subset.height() == 2);
             REPORTER_ASSERT(reporter, subset.alphaType() == bitmap.alphaType());
             REPORTER_ASSERT(reporter, subset.isVolatile() == true);

             // Test copying an extracted subset.
             for (size_t j = 0; j < SK_ARRAY_COUNT(gPairs); j++) {
                 SkBitmap copy;
                 bool success = subset.copyTo(&copy, gPairs[j].fConfig);
                 if (!success) {
                     // Skip checking that success matches fValid, which is redundant
                     // with the code below.
                     REPORTER_ASSERT(reporter, gPairs[i].fConfig != gPairs[j].fConfig);
                     continue;
                 }

                 // When performing a copy of an extracted subset, the gen id should
                 // change.
                 REPORTER_ASSERT(reporter, copy.getGenerationID() != subset.getGenerationID());

                 REPORTER_ASSERT(reporter, copy.width() == W);
                 REPORTER_ASSERT(reporter, copy.height() == 2);

                 if (gPairs[i].fConfig == gPairs[j].fConfig) {
                     SkAutoLockPixels alp0(subset);
                     SkAutoLockPixels alp1(copy);
                     // they should both have, or both not-have, a colortable
                     bool hasCT = subset.getColorTable() != NULL;
                     REPORTER_ASSERT(reporter, (copy.getColorTable() != NULL) == hasCT);
                 }
             }
         }

         bitmap = srcPremul;
         bitmap.setIsVolatile(false);
         if (bitmap.extractSubset(&subset, r)) {
             REPORTER_ASSERT(reporter, subset.alphaType() == bitmap.alphaType());
             REPORTER_ASSERT(reporter, subset.isVolatile() == false);
         }
     }
 }

 DEF_TEST(BitmapCopy, reporter) {
     static const bool isExtracted[] = {
         false, true
     };

     for (size_t i = 0; i < SK_ARRAY_COUNT(gPairs); i++) {
         SkBitmap srcOpaque, srcPremul;
         setup_src_bitmaps(&srcOpaque, &srcPremul, gPairs[i].fConfig);

         for (size_t j = 0; j < SK_ARRAY_COUNT(gPairs); j++) {
             SkBitmap dst;

             bool success = srcPremul.copyTo(&dst, gPairs[j].fConfig);
             bool expected = gPairs[i].fValid[j] != '0';
             if (success != expected) {
                 ERRORF(reporter, "SkBitmap::copyTo from %s to %s. expected %s "
                        "returned %s", gConfigName[i], gConfigName[j],
                        boolStr(expected), boolStr(success));
             }

             bool canSucceed = srcPremul.canCopyTo(gPairs[j].fConfig);
             if (success != canSucceed) {
                 ERRORF(reporter, "SkBitmap::copyTo from %s to %s. returned %s "
                        "canCopyTo %s", gConfigName[i], gConfigName[j],
                        boolStr(success), boolStr(canSucceed));
             }

             if (success) {
                 REPORTER_ASSERT(reporter, srcPremul.width() == dst.width());
                 REPORTER_ASSERT(reporter, srcPremul.height() == dst.height());
                 REPORTER_ASSERT(reporter, dst.config() == gPairs[j].fConfig);
                 test_isOpaque(reporter, srcOpaque, srcPremul, dst.config());
                 if (srcPremul.config() == dst.config()) {
                     SkAutoLockPixels srcLock(srcPremul);
                     SkAutoLockPixels dstLock(dst);
                     REPORTER_ASSERT(reporter, srcPremul.readyToDraw());
                     REPORTER_ASSERT(reporter, dst.readyToDraw());
                     const char* srcP = (const char*)srcPremul.getAddr(0, 0);
                     const char* dstP = (const char*)dst.getAddr(0, 0);
                     REPORTER_ASSERT(reporter, srcP != dstP);
                     REPORTER_ASSERT(reporter, !memcmp(srcP, dstP,
                                                       srcPremul.getSize()));
                     REPORTER_ASSERT(reporter, srcPremul.getGenerationID() == dst.getGenerationID());
                 } else {
                     REPORTER_ASSERT(reporter, srcPremul.getGenerationID() != dst.getGenerationID());
                 }
             } else {
                 // dst should be unchanged from its initial state
                 REPORTER_ASSERT(reporter, dst.config() == SkBitmap::kNo_Config);
                 REPORTER_ASSERT(reporter, dst.width() == 0);
                 REPORTER_ASSERT(reporter, dst.height() == 0);
             }
         } // for (size_t j = ...

         // Tests for getSafeSize(), getSafeSize64(), copyPixelsTo(),
         // copyPixelsFrom().
         //
         for (size_t copyCase = 0; copyCase < SK_ARRAY_COUNT(isExtracted);
              ++copyCase) {
             // Test copying to/from external buffer.
             // Note: the tests below have hard-coded values ---
             //       Please take care if modifying.

             // Tests for getSafeSize64().
             // Test with a very large configuration without pixel buffer
             // attached.
             SkBitmap tstSafeSize;
             tstSafeSize.setConfig(gPairs[i].fConfig, 100000000U,
                                   100000000U);
             int64_t safeSize = tstSafeSize.computeSafeSize64();
             if (safeSize < 0) {
                 ERRORF(reporter, "getSafeSize64() negative: %s",
                        getSkConfigName(tstSafeSize));
             }
             bool sizeFail = false;
             // Compare against hand-computed values.
             switch (gPairs[i].fConfig) {
                 case SkBitmap::kNo_Config:
                     break;

                 case SkBitmap::kA8_Config:
                 case SkBitmap::kIndex8_Config:
                     if (safeSize != 0x2386F26FC10000LL) {
                         sizeFail = true;
                     }
                     break;

                 case SkBitmap::kRGB_565_Config:
                 case SkBitmap::kARGB_4444_Config:
                     if (safeSize != 0x470DE4DF820000LL) {
                         sizeFail = true;
                     }
                     break;

                 case SkBitmap::kARGB_8888_Config:
                     if (safeSize != 0x8E1BC9BF040000LL) {
                         sizeFail = true;
                     }
                     break;

                 default:
                     break;
             }
             if (sizeFail) {
                 ERRORF(reporter, "computeSafeSize64() wrong size: %s",
                        getSkConfigName(tstSafeSize));
             }

             int subW = 2;
             int subH = 2;

             // Create bitmap to act as source for copies and subsets.
             SkBitmap src, subset;
             SkColorTable* ct = NULL;
             if (isExtracted[copyCase]) { // A larger image to extract from.
                 src.setConfig(gPairs[i].fConfig, 2 * subW + 1, subH);
             } else { // Tests expect a 2x2 bitmap, so make smaller.
                 src.setConfig(gPairs[i].fConfig, subW, subH);
             }
             if (SkBitmap::kIndex8_Config == src.config()) {
                 ct = init_ctable(kPremul_SkAlphaType);
             }

             src.allocPixels(ct);
             SkSafeUnref(ct);

             // Either copy src or extract into 'subset', which is used
             // for subsequent calls to copyPixelsTo/From.
             bool srcReady = false;
             if (isExtracted[copyCase]) {
                 // The extractedSubset() test case allows us to test copy-
                 // ing when src and dst mave possibly different strides.
                 SkIRect r;
                 r.set(1, 0, 1 + subW, subH); // 2x2 extracted bitmap

                 srcReady = src.extractSubset(&subset, r);
             } else {
                 srcReady = src.copyTo(&subset, src.config());
             }

             // Not all configurations will generate a valid 'subset'.
             if (srcReady) {

                 // Allocate our target buffer 'buf' for all copies.
                 // To simplify verifying correctness of copies attach
                 // buf to a SkBitmap, but copies are done using the
                 // raw buffer pointer.
                 const size_t bufSize = subH *
                     SkBitmap::ComputeRowBytes(src.config(), subW) * 2;
                 SkAutoMalloc autoBuf (bufSize);
                 uint8_t* buf = static_cast<uint8_t*>(autoBuf.get());

                 SkBitmap bufBm; // Attach buf to this bitmap.
                 bool successExpected;

                 // Set up values for each pixel being copied.
                 Coordinates coords(subW * subH);
                 for (int x = 0; x < subW; ++x)
                     for (int y = 0; y < subH; ++y)
                     {
                         int index = y * subW + x;
                         SkASSERT(index < coords.length);
                         coords[index]->fX = x;
                         coords[index]->fY = y;
                     }

                 writeCoordPixels(subset, coords);

                 // Test #1 ////////////////////////////////////////////

                 // Before/after comparisons easier if we attach buf
                 // to an appropriately configured SkBitmap.
                 memset(buf, 0xFF, bufSize);
                 // Config with stride greater than src but that fits in buf.
                 bufBm.setConfig(gPairs[i].fConfig, subW, subH,
                     SkBitmap::ComputeRowBytes(subset.config(), subW) * 2);
                 bufBm.setPixels(buf);
                 successExpected = false;
                 // Then attempt to copy with a stride that is too large
                 // to fit in the buffer.
                 REPORTER_ASSERT(reporter,
                     subset.copyPixelsTo(buf, bufSize, bufBm.rowBytes() * 3)
                     == successExpected);

                 if (successExpected)
                     reportCopyVerification(subset, bufBm, coords,
                         "copyPixelsTo(buf, bufSize, 1.5*maxRowBytes)",
                         reporter);

                 // Test #2 ////////////////////////////////////////////
                 // This test should always succeed, but in the case
                 // of extracted bitmaps only because we handle the
                 // issue of getSafeSize(). Without getSafeSize()
                 // buffer overrun/read would occur.
                 memset(buf, 0xFF, bufSize);
                 bufBm.setConfig(gPairs[i].fConfig, subW, subH,
                                 subset.rowBytes());
                 bufBm.setPixels(buf);
                 successExpected = subset.getSafeSize() <= bufSize;
                 REPORTER_ASSERT(reporter,
                     subset.copyPixelsTo(buf, bufSize) ==
                         successExpected);
                 if (successExpected)
                     reportCopyVerification(subset, bufBm, coords,
                     "copyPixelsTo(buf, bufSize)", reporter);

                 // Test #3 ////////////////////////////////////////////
                 // Copy with different stride between src and dst.
                 memset(buf, 0xFF, bufSize);
                 bufBm.setConfig(gPairs[i].fConfig, subW, subH,
                                 subset.rowBytes()+1);
                 bufBm.setPixels(buf);
                 successExpected = true; // Should always work.
                 REPORTER_ASSERT(reporter,
                         subset.copyPixelsTo(buf, bufSize,
                             subset.rowBytes()+1) == successExpected);
                 if (successExpected)
                     reportCopyVerification(subset, bufBm, coords,
                     "copyPixelsTo(buf, bufSize, rowBytes+1)", reporter);

                 // Test #4 ////////////////////////////////////////////
                 // Test copy with stride too small.
                 memset(buf, 0xFF, bufSize);
                 bufBm.setConfig(gPairs[i].fConfig, subW, subH);
                 bufBm.setPixels(buf);
                 successExpected = false;
                 // Request copy with stride too small.
                 REPORTER_ASSERT(reporter,
                     subset.copyPixelsTo(buf, bufSize, bufBm.rowBytes()-1)
                         == successExpected);
                 if (successExpected)
                     reportCopyVerification(subset, bufBm, coords,
                     "copyPixelsTo(buf, bufSize, rowBytes()-1)", reporter);

 #if 0   // copyPixelsFrom is gone
                 // Test #5 ////////////////////////////////////////////
                 // Tests the case where the source stride is too small
                 // for the source configuration.
                 memset(buf, 0xFF, bufSize);
                 bufBm.setConfig(gPairs[i].fConfig, subW, subH);
                 bufBm.setPixels(buf);
                 writeCoordPixels(bufBm, coords);
                 REPORTER_ASSERT(reporter,
                     subset.copyPixelsFrom(buf, bufSize, 1) == false);

                 // Test #6 ///////////////////////////////////////////
                 // Tests basic copy from an external buffer to the bitmap.
                 // If the bitmap is "extracted", this also tests the case
                 // where the source stride is different from the dest.
                 // stride.
                 // We've made the buffer large enough to always succeed.
                 bufBm.setConfig(gPairs[i].fConfig, subW, subH);
                 bufBm.setPixels(buf);
                 writeCoordPixels(bufBm, coords);
                 REPORTER_ASSERT(reporter,
                     subset.copyPixelsFrom(buf, bufSize, bufBm.rowBytes()) ==
                         true);
                 reportCopyVerification(bufBm, subset, coords,
                     "copyPixelsFrom(buf, bufSize)",
                     reporter);

                 // Test #7 ////////////////////////////////////////////
                 // Tests the case where the source buffer is too small
                 // for the transfer.
                 REPORTER_ASSERT(reporter,
                     subset.copyPixelsFrom(buf, 1, subset.rowBytes()) ==
                         false);

 #endif
             }
         } // for (size_t copyCase ...
     }
 }
	/*
	* Copyright 2011 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/
	#include "Test.h"
	#include "SkBitmap.h"
	#include "SkRect.h"

	static const char* boolStr(bool value) {
	return value ? "true" : "false";
	}

	// these are in the same order as the SkBitmap::Config enum
	static const char* gConfigName[] = {
	"None", "A8", "Index8", "565", "4444", "8888"
	};

	static void report_opaqueness(skiatest::Reporter* reporter, const SkBitmap& src,
	const SkBitmap& dst) {
	ERRORF(reporter, "src %s opaque:%d, dst %s opaque:%d",
	gConfigName[src.config()], src.isOpaque(),
	gConfigName[dst.config()], dst.isOpaque());
	}

	static bool canHaveAlpha(SkBitmap::Config config) {
	return config != SkBitmap::kRGB_565_Config;
	}

	// copyTo() should preserve isOpaque when it makes sense
	static void test_isOpaque(skiatest::Reporter* reporter,
	const SkBitmap& srcOpaque, const SkBitmap& srcPremul,
	SkBitmap::Config dstConfig) {
	SkBitmap dst;

	if (canHaveAlpha(srcPremul.config()) && canHaveAlpha(dstConfig)) {
	REPORTER_ASSERT(reporter, srcPremul.copyTo(&dst, dstConfig));
	REPORTER_ASSERT(reporter, dst.config() == dstConfig);
	if (srcPremul.isOpaque() != dst.isOpaque()) {
	report_opaqueness(reporter, srcPremul, dst);
	}
	}

	REPORTER_ASSERT(reporter, srcOpaque.copyTo(&dst, dstConfig));
	REPORTER_ASSERT(reporter, dst.config() == dstConfig);
	if (srcOpaque.isOpaque() != dst.isOpaque()) {
	report_opaqueness(reporter, srcOpaque, dst);
	}
	}

	static void init_src(const SkBitmap& bitmap) {
	SkAutoLockPixels lock(bitmap);
	if (bitmap.getPixels()) {
	if (bitmap.getColorTable()) {
	sk_bzero(bitmap.getPixels(), bitmap.getSize());
	} else {
	bitmap.eraseColor(SK_ColorWHITE);
	}
	}
	}

	static SkColorTable* init_ctable(SkAlphaType alphaType) {
	static const SkColor colors[] = {
	SK_ColorBLACK, SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE
	};
	return new SkColorTable(colors, SK_ARRAY_COUNT(colors), alphaType);
	}

	struct Pair {
	SkBitmap::Config fConfig;
	const char* fValid;
	};

	// Utility functions for copyPixelsTo()/copyPixelsFrom() tests.
	// getPixel()
	// setPixel()
	// getSkConfigName()
	// struct Coordinates
	// reportCopyVerification()
	// writeCoordPixels()

	// Utility function to read the value of a given pixel in bm. All
	// values converted to uint32_t for simplification of comparisons.
	static uint32_t getPixel(int x, int y, const SkBitmap& bm) {
	uint32_t val = 0;
	uint16_t val16;
	uint8_t val8;
	SkAutoLockPixels lock(bm);
	const void* rawAddr = bm.getAddr(x,y);

	switch (bm.config()) {
	case SkBitmap::kARGB_8888_Config:
	memcpy(&val, rawAddr, sizeof(uint32_t));
	break;
	case SkBitmap::kARGB_4444_Config:
	case SkBitmap::kRGB_565_Config:
	memcpy(&val16, rawAddr, sizeof(uint16_t));
	val = val16;
	break;
	case SkBitmap::kA8_Config:
	case SkBitmap::kIndex8_Config:
	memcpy(&val8, rawAddr, sizeof(uint8_t));
	val = val8;
	break;
	default:
	break;
	}
	return val;
	}

	// Utility function to set value of any pixel in bm.
	// bm.getConfig() specifies what format 'val' must be
	// converted to, but at present uint32_t can handle all formats.
	static void setPixel(int x, int y, uint32_t val, SkBitmap& bm) {
	uint16_t val16;
	uint8_t val8;
	SkAutoLockPixels lock(bm);
	void* rawAddr = bm.getAddr(x,y);

	switch (bm.config()) {
	case SkBitmap::kARGB_8888_Config:
	memcpy(rawAddr, &val, sizeof(uint32_t));
	break;
	case SkBitmap::kARGB_4444_Config:
	case SkBitmap::kRGB_565_Config:
	val16 = val & 0xFFFF;
	memcpy(rawAddr, &val16, sizeof(uint16_t));
	break;
	case SkBitmap::kA8_Config:
	case SkBitmap::kIndex8_Config:
	val8 = val & 0xFF;
	memcpy(rawAddr, &val8, sizeof(uint8_t));
	break;
	default:
	// Ignore.
	break;
	}
	}

	// Utility to return string containing name of each format, to
	// simplify diagnostic output.
	static const char* getSkConfigName(const SkBitmap& bm) {
	switch (bm.config()) {
	case SkBitmap::kNo_Config: return "SkBitmap::kNo_Config";
	case SkBitmap::kA8_Config: return "SkBitmap::kA8_Config";
	case SkBitmap::kIndex8_Config: return "SkBitmap::kIndex8_Config";
	case SkBitmap::kRGB_565_Config: return "SkBitmap::kRGB_565_Config";
	case SkBitmap::kARGB_4444_Config: return "SkBitmap::kARGB_4444_Config";
	case SkBitmap::kARGB_8888_Config: return "SkBitmap::kARGB_8888_Config";
	default: return "Unknown SkBitmap configuration.";
	}
	}

	// Helper struct to contain pixel locations, while avoiding need for STL.
	struct Coordinates {

	const int length;
	SkIPoint* const data;

	explicit Coordinates(int _length): length(_length)
	, data(new SkIPoint[length]) { }

	~Coordinates(){
	delete [] data;
	}

	SkIPoint* operator[](int i) const {
	// Use with care, no bounds checking.
	return data + i;
	}
	};

	// A function to verify that two bitmaps contain the same pixel values
	// at all coordinates indicated by coords. Simplifies verification of
	// copied bitmaps.
	static void reportCopyVerification(const SkBitmap& bm1, const SkBitmap& bm2,
	Coordinates& coords,
	const char* msg,
	skiatest::Reporter* reporter){
	bool success = true;

	// Confirm all pixels in the list match.
	for (int i = 0; i < coords.length; ++i) {
	success = success &&
	(getPixel(coords[i]->fX, coords[i]->fY, bm1) ==
	getPixel(coords[i]->fX, coords[i]->fY, bm2));
	}

	if (!success) {
	ERRORF(reporter, "%s [config = %s]", msg, getSkConfigName(bm1));
	}
	}

	// Writes unique pixel values at locations specified by coords.
	static void writeCoordPixels(SkBitmap& bm, const Coordinates& coords) {
	for (int i = 0; i < coords.length; ++i)
	setPixel(coords[i]->fX, coords[i]->fY, i, bm);
	}

	static const Pair gPairs[] = {
	{ SkBitmap::kNo_Config, "0000000" },
	{ SkBitmap::kA8_Config, "0101010" },
	{ SkBitmap::kIndex8_Config, "0111010" },
	{ SkBitmap::kRGB_565_Config, "0101010" },
	{ SkBitmap::kARGB_4444_Config, "0101110" },
	{ SkBitmap::kARGB_8888_Config, "0101110" },
	};

	static const int W = 20;
	static const int H = 33;

	static void setup_src_bitmaps(SkBitmap* srcOpaque, SkBitmap* srcPremul,
	SkBitmap::Config config) {
	SkColorTable* ctOpaque = NULL;
	SkColorTable* ctPremul = NULL;

	srcOpaque->setConfig(config, W, H, 0, kOpaque_SkAlphaType);
	srcPremul->setConfig(config, W, H, 0, kPremul_SkAlphaType);
	if (SkBitmap::kIndex8_Config == config) {
	ctOpaque = init_ctable(kOpaque_SkAlphaType);
	ctPremul = init_ctable(kPremul_SkAlphaType);
	}
	srcOpaque->allocPixels(ctOpaque);
	srcPremul->allocPixels(ctPremul);
	SkSafeUnref(ctOpaque);
	SkSafeUnref(ctPremul);
	init_src(*srcOpaque);
	init_src(*srcPremul);
	}

	DEF_TEST(BitmapCopy_extractSubset, reporter) {
	for (size_t i = 0; i < SK_ARRAY_COUNT(gPairs); i++) {
	SkBitmap srcOpaque, srcPremul;
	setup_src_bitmaps(&srcOpaque, &srcPremul, gPairs[i].fConfig);

	SkBitmap bitmap(srcOpaque);
	SkBitmap subset;
	SkIRect r;
	// Extract a subset which has the same width as the original. This
	// catches a bug where we cloned the genID incorrectly.
	r.set(0, 1, W, 3);
	bitmap.setIsVolatile(true);
	if (bitmap.extractSubset(&subset, r)) {
	REPORTER_ASSERT(reporter, subset.width() == W);
	REPORTER_ASSERT(reporter, subset.height() == 2);
	REPORTER_ASSERT(reporter, subset.alphaType() == bitmap.alphaType());
	REPORTER_ASSERT(reporter, subset.isVolatile() == true);

	// Test copying an extracted subset.
	for (size_t j = 0; j < SK_ARRAY_COUNT(gPairs); j++) {
	SkBitmap copy;
	bool success = subset.copyTo(&copy, gPairs[j].fConfig);
	if (!success) {
	// Skip checking that success matches fValid, which is redundant
	// with the code below.
	REPORTER_ASSERT(reporter, gPairs[i].fConfig != gPairs[j].fConfig);
	continue;
	}

	// When performing a copy of an extracted subset, the gen id should
	// change.
	REPORTER_ASSERT(reporter, copy.getGenerationID() != subset.getGenerationID());

	REPORTER_ASSERT(reporter, copy.width() == W);
	REPORTER_ASSERT(reporter, copy.height() == 2);

	if (gPairs[i].fConfig == gPairs[j].fConfig) {
	SkAutoLockPixels alp0(subset);
	SkAutoLockPixels alp1(copy);
	// they should both have, or both not-have, a colortable
	bool hasCT = subset.getColorTable() != NULL;
	REPORTER_ASSERT(reporter, (copy.getColorTable() != NULL) == hasCT);
	}
	}
	}

	bitmap = srcPremul;
	bitmap.setIsVolatile(false);
	if (bitmap.extractSubset(&subset, r)) {
	REPORTER_ASSERT(reporter, subset.alphaType() == bitmap.alphaType());
	REPORTER_ASSERT(reporter, subset.isVolatile() == false);
	}
	}
	}

	DEF_TEST(BitmapCopy, reporter) {
	static const bool isExtracted[] = {
	false, true
	};

	for (size_t i = 0; i < SK_ARRAY_COUNT(gPairs); i++) {
	SkBitmap srcOpaque, srcPremul;
	setup_src_bitmaps(&srcOpaque, &srcPremul, gPairs[i].fConfig);

	for (size_t j = 0; j < SK_ARRAY_COUNT(gPairs); j++) {
	SkBitmap dst;

	bool success = srcPremul.copyTo(&dst, gPairs[j].fConfig);
	bool expected = gPairs[i].fValid[j] != '0';
	if (success != expected) {
	ERRORF(reporter, "SkBitmap::copyTo from %s to %s. expected %s "
	"returned %s", gConfigName[i], gConfigName[j],
	boolStr(expected), boolStr(success));
	}

	bool canSucceed = srcPremul.canCopyTo(gPairs[j].fConfig);
	if (success != canSucceed) {
	ERRORF(reporter, "SkBitmap::copyTo from %s to %s. returned %s "
	"canCopyTo %s", gConfigName[i], gConfigName[j],
	boolStr(success), boolStr(canSucceed));
	}

	if (success) {
	REPORTER_ASSERT(reporter, srcPremul.width() == dst.width());
	REPORTER_ASSERT(reporter, srcPremul.height() == dst.height());
	REPORTER_ASSERT(reporter, dst.config() == gPairs[j].fConfig);
	test_isOpaque(reporter, srcOpaque, srcPremul, dst.config());
	if (srcPremul.config() == dst.config()) {
	SkAutoLockPixels srcLock(srcPremul);
	SkAutoLockPixels dstLock(dst);
	REPORTER_ASSERT(reporter, srcPremul.readyToDraw());
	REPORTER_ASSERT(reporter, dst.readyToDraw());
	const char* srcP = (const char*)srcPremul.getAddr(0, 0);
	const char* dstP = (const char*)dst.getAddr(0, 0);
	REPORTER_ASSERT(reporter, srcP != dstP);
	REPORTER_ASSERT(reporter, !memcmp(srcP, dstP,
	srcPremul.getSize()));
	REPORTER_ASSERT(reporter, srcPremul.getGenerationID() == dst.getGenerationID());
	} else {
	REPORTER_ASSERT(reporter, srcPremul.getGenerationID() != dst.getGenerationID());
	}
	} else {
	// dst should be unchanged from its initial state
	REPORTER_ASSERT(reporter, dst.config() == SkBitmap::kNo_Config);
	REPORTER_ASSERT(reporter, dst.width() == 0);
	REPORTER_ASSERT(reporter, dst.height() == 0);
	}
	} // for (size_t j = ...

	// Tests for getSafeSize(), getSafeSize64(), copyPixelsTo(),
	// copyPixelsFrom().
	//
	for (size_t copyCase = 0; copyCase < SK_ARRAY_COUNT(isExtracted);
	++copyCase) {
	// Test copying to/from external buffer.
	// Note: the tests below have hard-coded values ---
	// Please take care if modifying.

	// Tests for getSafeSize64().
	// Test with a very large configuration without pixel buffer
	// attached.
	SkBitmap tstSafeSize;
	tstSafeSize.setConfig(gPairs[i].fConfig, 100000000U,
	100000000U);
	int64_t safeSize = tstSafeSize.computeSafeSize64();
	if (safeSize < 0) {
	ERRORF(reporter, "getSafeSize64() negative: %s",
	getSkConfigName(tstSafeSize));
	}
	bool sizeFail = false;
	// Compare against hand-computed values.
	switch (gPairs[i].fConfig) {
	case SkBitmap::kNo_Config:
	break;

	case SkBitmap::kA8_Config:
	case SkBitmap::kIndex8_Config:
	if (safeSize != 0x2386F26FC10000LL) {
	sizeFail = true;
	}
	break;

	case SkBitmap::kRGB_565_Config:
	case SkBitmap::kARGB_4444_Config:
	if (safeSize != 0x470DE4DF820000LL) {
	sizeFail = true;
	}
	break;

	case SkBitmap::kARGB_8888_Config:
	if (safeSize != 0x8E1BC9BF040000LL) {
	sizeFail = true;
	}
	break;

	default:
	break;
	}
	if (sizeFail) {
	ERRORF(reporter, "computeSafeSize64() wrong size: %s",
	getSkConfigName(tstSafeSize));
	}

	int subW = 2;
	int subH = 2;

	// Create bitmap to act as source for copies and subsets.
	SkBitmap src, subset;
	SkColorTable* ct = NULL;
	if (isExtracted[copyCase]) { // A larger image to extract from.
	src.setConfig(gPairs[i].fConfig, 2 * subW + 1, subH);
	} else { // Tests expect a 2x2 bitmap, so make smaller.
	src.setConfig(gPairs[i].fConfig, subW, subH);
	}
	if (SkBitmap::kIndex8_Config == src.config()) {
	ct = init_ctable(kPremul_SkAlphaType);
	}

	src.allocPixels(ct);
	SkSafeUnref(ct);

	// Either copy src or extract into 'subset', which is used
	// for subsequent calls to copyPixelsTo/From.
	bool srcReady = false;
	if (isExtracted[copyCase]) {
	// The extractedSubset() test case allows us to test copy-
	// ing when src and dst mave possibly different strides.
	SkIRect r;
	r.set(1, 0, 1 + subW, subH); // 2x2 extracted bitmap

	srcReady = src.extractSubset(&subset, r);
	} else {
	srcReady = src.copyTo(&subset, src.config());
	}

	// Not all configurations will generate a valid 'subset'.
	if (srcReady) {

	// Allocate our target buffer 'buf' for all copies.
	// To simplify verifying correctness of copies attach
	// buf to a SkBitmap, but copies are done using the
	// raw buffer pointer.
	const size_t bufSize = subH *
	SkBitmap::ComputeRowBytes(src.config(), subW) * 2;
	SkAutoMalloc autoBuf (bufSize);
	uint8_t* buf = static_cast<uint8_t*>(autoBuf.get());

	SkBitmap bufBm; // Attach buf to this bitmap.
	bool successExpected;

	// Set up values for each pixel being copied.
	Coordinates coords(subW * subH);
	for (int x = 0; x < subW; ++x)
	for (int y = 0; y < subH; ++y)
	{
	int index = y * subW + x;
	SkASSERT(index < coords.length);
	coords[index]->fX = x;
	coords[index]->fY = y;
	}

	writeCoordPixels(subset, coords);

	// Test #1 ////////////////////////////////////////////

	// Before/after comparisons easier if we attach buf
	// to an appropriately configured SkBitmap.
	memset(buf, 0xFF, bufSize);
	// Config with stride greater than src but that fits in buf.
	bufBm.setConfig(gPairs[i].fConfig, subW, subH,
	SkBitmap::ComputeRowBytes(subset.config(), subW) * 2);
	bufBm.setPixels(buf);
	successExpected = false;
	// Then attempt to copy with a stride that is too large
	// to fit in the buffer.
	REPORTER_ASSERT(reporter,
	subset.copyPixelsTo(buf, bufSize, bufBm.rowBytes() * 3)
	== successExpected);

	if (successExpected)
	reportCopyVerification(subset, bufBm, coords,
	"copyPixelsTo(buf, bufSize, 1.5*maxRowBytes)",
	reporter);

	// Test #2 ////////////////////////////////////////////
	// This test should always succeed, but in the case
	// of extracted bitmaps only because we handle the
	// issue of getSafeSize(). Without getSafeSize()
	// buffer overrun/read would occur.
	memset(buf, 0xFF, bufSize);
	bufBm.setConfig(gPairs[i].fConfig, subW, subH,
	subset.rowBytes());
	bufBm.setPixels(buf);
	successExpected = subset.getSafeSize() <= bufSize;
	REPORTER_ASSERT(reporter,
	subset.copyPixelsTo(buf, bufSize) ==
	successExpected);
	if (successExpected)
	reportCopyVerification(subset, bufBm, coords,
	"copyPixelsTo(buf, bufSize)", reporter);

	// Test #3 ////////////////////////////////////////////
	// Copy with different stride between src and dst.
	memset(buf, 0xFF, bufSize);
	bufBm.setConfig(gPairs[i].fConfig, subW, subH,
	subset.rowBytes()+1);
	bufBm.setPixels(buf);
	successExpected = true; // Should always work.
	REPORTER_ASSERT(reporter,
	subset.copyPixelsTo(buf, bufSize,
	subset.rowBytes()+1) == successExpected);
	if (successExpected)
	reportCopyVerification(subset, bufBm, coords,
	"copyPixelsTo(buf, bufSize, rowBytes+1)", reporter);

	// Test #4 ////////////////////////////////////////////
	// Test copy with stride too small.
	memset(buf, 0xFF, bufSize);
	bufBm.setConfig(gPairs[i].fConfig, subW, subH);
	bufBm.setPixels(buf);
	successExpected = false;
	// Request copy with stride too small.
	REPORTER_ASSERT(reporter,
	subset.copyPixelsTo(buf, bufSize, bufBm.rowBytes()-1)
	== successExpected);
	if (successExpected)
	reportCopyVerification(subset, bufBm, coords,
	"copyPixelsTo(buf, bufSize, rowBytes()-1)", reporter);

	#if 0 // copyPixelsFrom is gone
	// Test #5 ////////////////////////////////////////////
	// Tests the case where the source stride is too small
	// for the source configuration.
	memset(buf, 0xFF, bufSize);
	bufBm.setConfig(gPairs[i].fConfig, subW, subH);
	bufBm.setPixels(buf);
	writeCoordPixels(bufBm, coords);
	REPORTER_ASSERT(reporter,
	subset.copyPixelsFrom(buf, bufSize, 1) == false);

	// Test #6 ///////////////////////////////////////////
	// Tests basic copy from an external buffer to the bitmap.
	// If the bitmap is "extracted", this also tests the case
	// where the source stride is different from the dest.
	// stride.
	// We've made the buffer large enough to always succeed.
	bufBm.setConfig(gPairs[i].fConfig, subW, subH);
	bufBm.setPixels(buf);
	writeCoordPixels(bufBm, coords);
	REPORTER_ASSERT(reporter,
	subset.copyPixelsFrom(buf, bufSize, bufBm.rowBytes()) ==
	true);
	reportCopyVerification(bufBm, subset, coords,
	"copyPixelsFrom(buf, bufSize)",
	reporter);

	// Test #7 ////////////////////////////////////////////
	// Tests the case where the source buffer is too small
	// for the transfer.
	REPORTER_ASSERT(reporter,
	subset.copyPixelsFrom(buf, 1, subset.rowBytes()) ==
	false);

	#endif
	}
	} // for (size_t copyCase ...
	}
	}