/*static*/ bool SkBitmapHasher::ComputeDigestInternal(const SkBitmap& bitmap, uint64_t *result) {
SkMD5 out;
// start with the x/y dimensions
write_int32_to_buffer(SkToU32(bitmap.width()), &out);
write_int32_to_buffer(SkToU32(bitmap.height()), &out);
// add all the pixel data
SkAutoTDelete<SkImageEncoder> enc(CreateARGBImageEncoder());
if (!enc->encodeStream(&out, bitmap, SkImageEncoder::kDefaultQuality)) {
return false;
}
SkMD5::Digest digest;
out.finish(digest);
*result = first_8_bytes_as_uint64(digest.data);
return true;
}
DEF_TEST(ARGBImageEncoder, reporter) {
// Bytes we expect to get:
const int kWidth = 3;
const int kHeight = 5;
const unsigned char comparisonBuffer[] = {
// kHeight rows, each with kWidth pixels, premultiplied ARGB for each pixel
0xff,0xff,0x00,0x00, 0xff,0xff,0x00,0x00, 0xff,0xff,0x00,0x00, // red
0xff,0x00,0xff,0x00, 0xff,0x00,0xff,0x00, 0xff,0x00,0xff,0x00, // green
0xff,0x00,0x00,0xff, 0xff,0x00,0x00,0xff, 0xff,0x00,0x00,0xff, // blue
0xff,0x00,0x00,0xff, 0xff,0x00,0x00,0xff, 0xff,0x00,0x00,0xff, // blue
0xff,0x00,0x00,0xff, 0xff,0x00,0x00,0xff, 0xff,0x00,0x00,0xff, // blue
};
SkAutoTDelete<SkImageEncoder> enc(CreateARGBImageEncoder());
for (size_t ctIndex = 0; ctIndex < SK_ARRAY_COUNT(gColorTypes); ++ctIndex) {
// A bitmap that should generate the above bytes:
SkBitmap bitmap;
{
bitmap.allocPixels(SkImageInfo::Make(kWidth, kHeight, gColorTypes[ctIndex],
kOpaque_SkAlphaType));
bitmap.eraseColor(SK_ColorBLUE);
// Change rows [0,1] from blue to [red,green].
SkCanvas canvas(bitmap);
SkPaint paint;
paint.setColor(SK_ColorRED);
canvas.drawIRect(SkIRect::MakeLTRB(0, 0, kWidth, 1), paint);
paint.setColor(SK_ColorGREEN);
canvas.drawIRect(SkIRect::MakeLTRB(0, 1, kWidth, 2), paint);
}
// Transform the bitmap.
int bufferSize = bitmap.width() * bitmap.height() * 4;
SkAutoMalloc pixelBufferManager(bufferSize);
char *pixelBuffer = static_cast<char *>(pixelBufferManager.get());
SkMemoryWStream out(pixelBuffer, bufferSize);
REPORTER_ASSERT(reporter, enc->encodeStream(&out, bitmap, SkImageEncoder::kDefaultQuality));
// Confirm we got the expected results.
REPORTER_ASSERT(reporter, bufferSize == sizeof(comparisonBuffer));
REPORTER_ASSERT(reporter, memcmp(pixelBuffer, comparisonBuffer, bufferSize) == 0);
}
}
/*static*/ bool SkBitmapHasher::ComputeDigestInternal(const SkBitmap& bitmap,
SkHashDigest *result) {
size_t pixelBufferSize = bitmap.width() * bitmap.height() * 4;
size_t totalBufferSize = pixelBufferSize + 2 * sizeof(uint32_t);
SkAutoMalloc bufferManager(totalBufferSize);
char *bufferStart = static_cast<char *>(bufferManager.get());
SkMemoryWStream out(bufferStart, totalBufferSize);
// start with the x/y dimensions
write_int_to_buffer(SkToU32(bitmap.width()), &out);
write_int_to_buffer(SkToU32(bitmap.height()), &out);
// add all the pixel data
SkAutoTDelete<SkImageEncoder> enc(CreateARGBImageEncoder());
if (!enc->encodeStream(&out, bitmap, SkImageEncoder::kDefaultQuality)) {
return false;
}
*result = SkCityHash::Compute64(bufferStart, totalBufferSize);
return true;
}
