static sk_sp<SkShader> make_shader0(SkIPoint* size) {
SkBitmap bm;
size->set(2, 2);
SkPMColor color0 = SkPreMultiplyARGB(0x80, 0x80, 0xff, 0x80);
SkPMColor color1 = SkPreMultiplyARGB(0x40, 0xff, 0x00, 0xff);
bm.allocN32Pixels(size->fX, size->fY);
bm.eraseColor(color0);
uint32_t* pixels = (uint32_t*) bm.getPixels();
pixels[0] = pixels[2] = color0;
pixels[1] = pixels[3] = color1;
return SkShader::MakeBitmapShader(bm, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode);
}
/**
* Interprets c as an unpremultiplied color, and returns the
* premultiplied equivalent.
*/
static SkPMColor premultiply_unpmcolor(SkPMColor c) {
U8CPU a = SkGetPackedA32(c);
U8CPU r = SkGetPackedR32(c);
U8CPU g = SkGetPackedG32(c);
U8CPU b = SkGetPackedB32(c);
return SkPreMultiplyARGB(a, r, g, b);
}
void ImageBuffer::transformColorSpace(ColorSpace srcColorSpace, ColorSpace dstColorSpace)
{
const uint8_t* lookUpTable = ColorSpaceUtilities::getConversionLUT(dstColorSpace, srcColorSpace);
if (!lookUpTable)
return;
// FIXME: Disable color space conversions on accelerated canvases (for now).
if (context()->isAccelerated() || !isSurfaceValid())
return;
const SkBitmap& bitmap = m_surface->bitmap();
if (bitmap.isNull())
return;
ASSERT(bitmap.colorType() == kN32_SkColorType);
IntSize size = m_surface->size();
SkAutoLockPixels bitmapLock(bitmap);
for (int y = 0; y < size.height(); ++y) {
uint32_t* srcRow = bitmap.getAddr32(0, y);
for (int x = 0; x < size.width(); ++x) {
SkColor color = SkPMColorToColor(srcRow[x]);
srcRow[x] = SkPreMultiplyARGB(
SkColorGetA(color),
lookUpTable[SkColorGetR(color)],
lookUpTable[SkColorGetG(color)],
lookUpTable[SkColorGetB(color)]);
}
}
}
// Set a bitmap shader that mimics dashing by width-on, width-off.
// Returns false if it could not succeed (e.g. there was an existing shader)
static bool setBitmapDash(SkPaint* paint, int width) {
if (width <= 0 || paint->getShader())
return false;
SkColor c = paint->getColor();
SkBitmap bm;
bm.setConfig(SkBitmap::kARGB_8888_Config, 2, 1);
bm.allocPixels();
bm.lockPixels();
// set the ON pixel
*bm.getAddr32(0, 0) = SkPreMultiplyARGB(0xFF, SkColorGetR(c),
SkColorGetG(c), SkColorGetB(c));
// set the OFF pixel
*bm.getAddr32(1, 0) = 0;
bm.unlockPixels();
SkMatrix matrix;
matrix.setScale(SkIntToScalar(width), SK_Scalar1);
SkShader* s = SkShader::CreateBitmapShader(bm, SkShader::kRepeat_TileMode,
SkShader::kClamp_TileMode);
s->setLocalMatrix(matrix);
paint->setShader(s)->unref();
return true;
}
void SkMatrixConvolutionImageFilter::filterPixels(const SkBitmap& src, SkBitmap* result, const SkIRect& rect) {
for (int y = rect.fTop; y < rect.fBottom; ++y) {
SkPMColor* dptr = result->getAddr32(rect.fLeft, y);
for (int x = rect.fLeft; x < rect.fRight; ++x) {
SkScalar sumA = 0, sumR = 0, sumG = 0, sumB = 0;
for (int cy = 0; cy < fKernelSize.fHeight; cy++) {
for (int cx = 0; cx < fKernelSize.fWidth; cx++) {
SkPMColor s = PixelFetcher::fetch(src, x + cx - fTarget.fX, y + cy - fTarget.fY);
SkScalar k = fKernel[cy * fKernelSize.fWidth + cx];
if (convolveAlpha) {
sumA += SkScalarMul(SkIntToScalar(SkGetPackedA32(s)), k);
}
sumR += SkScalarMul(SkIntToScalar(SkGetPackedR32(s)), k);
sumG += SkScalarMul(SkIntToScalar(SkGetPackedG32(s)), k);
sumB += SkScalarMul(SkIntToScalar(SkGetPackedB32(s)), k);
}
}
int a = convolveAlpha
? SkClampMax(SkScalarFloorToInt(SkScalarMul(sumA, fGain) + fBias), 255)
: 255;
int r = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumR, fGain) + fBias), a);
int g = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumG, fGain) + fBias), a);
int b = SkClampMax(SkScalarFloorToInt(SkScalarMul(sumB, fGain) + fBias), a);
if (!convolveAlpha) {
a = SkGetPackedA32(PixelFetcher::fetch(src, x, y));
*dptr++ = SkPreMultiplyARGB(a, r, g, b);
} else {
*dptr++ = SkPackARGB32(a, r, g, b);
}
}
}
}
static void convertToIndex666(const SkBitmap& src, SkBitmap* dst) {
SkColorTable* ctable = new SkColorTable(216);
SkPMColor* colors = ctable->lockColors();
// rrr ggg bbb
for (int r = 0; r < 6; r++) {
int rr = conv6ToByte(r);
for (int g = 0; g < 6; g++) {
int gg = conv6ToByte(g);
for (int b = 0; b < 6; b++) {
int bb = conv6ToByte(b);
*colors++ = SkPreMultiplyARGB(0xFF, rr, gg, bb);
}
}
}
ctable->unlockColors(true);
dst->setConfig(SkBitmap::kIndex8_Config, src.width(), src.height());
dst->allocPixels(ctable);
ctable->unref();
SkAutoLockPixels alps(src);
SkAutoLockPixels alpd(*dst);
for (int y = 0; y < src.height(); y++) {
const SkPMColor* srcP = src.getAddr32(0, y);
uint8_t* dstP = dst->getAddr8(0, y);
for (int x = src.width() - 1; x >= 0; --x) {
*dstP++ = compute666Index(*srcP++);
}
}
}
static void convert_to_index666(const SkBitmap& src, SkBitmap* dst) {
SkPMColor storage[216];
SkPMColor* colors = storage;
// rrr ggg bbb
for (int r = 0; r < 6; r++) {
int rr = conv_6_to_byte(r);
for (int g = 0; g < 6; g++) {
int gg = conv_6_to_byte(g);
for (int b = 0; b < 6; b++) {
int bb = conv_6_to_byte(b);
*colors++ = SkPreMultiplyARGB(0xFF, rr, gg, bb);
}
}
}
SkColorTable* ctable = new SkColorTable(storage, 216);
dst->allocPixels(SkImageInfo::Make(src.width(), src.height(),
kIndex_8_SkColorType, kOpaque_SkAlphaType),
NULL, ctable);
ctable->unref();
SkAutoLockPixels alps(src);
SkAutoLockPixels alpd(*dst);
for (int y = 0; y < src.height(); y++) {
const SkPMColor* srcP = src.getAddr32(0, y);
uint8_t* dstP = dst->getAddr8(0, y);
for (int x = src.width() - 1; x >= 0; --x) {
*dstP++ = compute_666_index(*srcP++);
}
}
}
void
skia_set_palette(const uint8_t *palette)
{
LOGI("skia_set_palette");
if(!g_color_table) {
g_color_table.reset(new SkColorTable(256));
}
SkPMColor *color_table = g_color_table->lockColors();
color_table[0] = SkPreMultiplyARGB(0, 0, 0, 0);
for (int i = 1; i < 256; i++) {
color_table[i] = SkPreMultiplyARGB(255, palette[i*3], palette[i*3+1], palette[i*3+2]);
}
g_color_table->unlockColors(true);
}
static SkShader* make_shader0(SkIPoint* size) {
SkBitmap bm;
size->set(2, 2);
bm.setConfig(SkBitmap::kARGB_8888_Config, size->fX, size->fY);
SkPMColor color0 = SkPreMultiplyARGB(0x80, 0x80, 0xff, 0x80);
SkPMColor color1 = SkPreMultiplyARGB(0x40, 0xff, 0x00, 0xff);
bm.allocPixels();
bm.eraseColor(color0);
bm.lockPixels();
uint32_t* pixels = (uint32_t*) bm.getPixels();
pixels[0] = pixels[2] = color0;
pixels[1] = pixels[3] = color1;
bm.unlockPixels();
return SkShader::CreateBitmapShader(bm, SkShader::kRepeat_TileMode,
SkShader::kRepeat_TileMode);
}
SkPMColor SkPreMultiplyColor(SkColor c) {
unsigned a = SkColorGetA(c);
unsigned r = SkColorGetR(c);
unsigned g = SkColorGetG(c);
unsigned b = SkColorGetB(c);
return SkPreMultiplyARGB(a, r, g, b);
}
/**
* First, make sure that writing an 8-bit RGBA KTX file and then
* reading it produces the same bitmap.
*/
DEF_TEST(KtxReadWrite, reporter) {
// Random number generator with explicit seed for reproducibility
SkRandom rand(0x1005cbad);
SkBitmap bm8888;
bool pixelsAllocated = bm8888.allocN32Pixels(128, 128);
REPORTER_ASSERT(reporter, pixelsAllocated);
uint8_t *pixels = reinterpret_cast<uint8_t*>(bm8888.getPixels());
REPORTER_ASSERT(reporter, NULL != pixels);
if (NULL == pixels) {
return;
}
uint8_t *row = pixels;
for (int y = 0; y < bm8888.height(); ++y) {
for (int x = 0; x < bm8888.width(); ++x) {
uint8_t a = rand.nextRangeU(0, 255);
uint8_t r = rand.nextRangeU(0, 255);
uint8_t g = rand.nextRangeU(0, 255);
uint8_t b = rand.nextRangeU(0, 255);
SkPMColor &pixel = *(reinterpret_cast<SkPMColor*>(row + x*sizeof(SkPMColor)));
pixel = SkPreMultiplyARGB(a, r, g, b);
}
row += bm8888.rowBytes();
}
REPORTER_ASSERT(reporter, !(bm8888.empty()));
SkAutoDataUnref encodedData(SkImageEncoder::EncodeData(bm8888, SkImageEncoder::kKTX_Type, 0));
REPORTER_ASSERT(reporter, NULL != encodedData);
SkAutoTUnref<SkMemoryStream> stream(SkNEW_ARGS(SkMemoryStream, (encodedData)));
REPORTER_ASSERT(reporter, NULL != stream);
SkBitmap decodedBitmap;
bool imageDecodeSuccess = SkImageDecoder::DecodeStream(stream, &decodedBitmap);
REPORTER_ASSERT(reporter, imageDecodeSuccess);
REPORTER_ASSERT(reporter, decodedBitmap.colorType() == bm8888.colorType());
REPORTER_ASSERT(reporter, decodedBitmap.alphaType() == bm8888.alphaType());
REPORTER_ASSERT(reporter, decodedBitmap.width() == bm8888.width());
REPORTER_ASSERT(reporter, decodedBitmap.height() == bm8888.height());
REPORTER_ASSERT(reporter, !(decodedBitmap.empty()));
uint8_t *decodedPixels = reinterpret_cast<uint8_t*>(decodedBitmap.getPixels());
REPORTER_ASSERT(reporter, NULL != decodedPixels);
REPORTER_ASSERT(reporter, decodedBitmap.getSize() == bm8888.getSize());
if (NULL == decodedPixels) {
return;
}
REPORTER_ASSERT(reporter, memcmp(decodedPixels, pixels, decodedBitmap.getSize()) == 0);
}
bool SkPopplerRasterizePDF(SkStream* pdf, SkBitmap* output) {
size_t size = pdf->getLength();
SkAutoFree buffer(sk_malloc_throw(size));
pdf->read(buffer.get(), size);
SkAutoTDelete<poppler::document> doc(
poppler::document::load_from_raw_data((const char*)buffer.get(), size));
if (!doc.get() || doc->is_locked()) {
return false;
}
SkAutoTDelete<poppler::page> page(doc->create_page(0));
poppler::page_renderer renderer;
poppler::image image = renderer.render_page(page.get());
if (!image.is_valid() || image.format() != poppler::image::format_argb32) {
return false;
}
int width = image.width(), height = image.height();
size_t rowSize = image.bytes_per_row();
char *imgData = image.data();
SkBitmap bitmap;
bitmap.setConfig(SkBitmap::kARGB_8888_Config, width, height);
if (!bitmap.allocPixels()) {
return false;
}
bitmap.eraseColor(SK_ColorWHITE);
SkPMColor* bitmapPixels = (SkPMColor*)bitmap.getPixels();
// do pixel-by-pixel copy to deal with RGBA ordering conversions
for (int y = 0; y < height; y++) {
char *rowData = imgData;
for (int x = 0; x < width; x++) {
uint8_t a = rowData[3];
uint8_t r = rowData[2];
uint8_t g = rowData[1];
uint8_t b = rowData[0];
*bitmapPixels = SkPreMultiplyARGB(a, r, g, b);
bitmapPixels++;
rowData += 4;
}
imgData += rowSize;
}
output->swap(bitmap);
return true;
}
/**
* Next test is to see whether or not reading an unpremultiplied KTX file accurately
* creates a premultiplied buffer...
*/
DEF_TEST(KtxReadUnpremul, reporter) {
static const uint8_t kHalfWhiteKTX[] = {
0xAB, 0x4B, 0x54, 0x58, 0x20, 0x31, // First twelve bytes is magic
0x31, 0xBB, 0x0D, 0x0A, 0x1A, 0x0A, // KTX identifier string
0x01, 0x02, 0x03, 0x04, // Then magic endian specifier
0x01, 0x14, 0x00, 0x00, // uint32_t fGLType;
0x01, 0x00, 0x00, 0x00, // uint32_t fGLTypeSize;
0x08, 0x19, 0x00, 0x00, // uint32_t fGLFormat;
0x58, 0x80, 0x00, 0x00, // uint32_t fGLInternalFormat;
0x08, 0x19, 0x00, 0x00, // uint32_t fGLBaseInternalFormat;
0x02, 0x00, 0x00, 0x00, // uint32_t fPixelWidth;
0x02, 0x00, 0x00, 0x00, // uint32_t fPixelHeight;
0x00, 0x00, 0x00, 0x00, // uint32_t fPixelDepth;
0x00, 0x00, 0x00, 0x00, // uint32_t fNumberOfArrayElements;
0x01, 0x00, 0x00, 0x00, // uint32_t fNumberOfFaces;
0x01, 0x00, 0x00, 0x00, // uint32_t fNumberOfMipmapLevels;
0x00, 0x00, 0x00, 0x00, // uint32_t fBytesOfKeyValueData;
0x10, 0x00, 0x00, 0x00, // image size: 2x2 image of RGBA = 4 * 4 = 16 bytes
0xFF, 0xFF, 0xFF, 0x80, // Pixel 1
0xFF, 0xFF, 0xFF, 0x80, // Pixel 2
0xFF, 0xFF, 0xFF, 0x80, // Pixel 3
0xFF, 0xFF, 0xFF, 0x80};// Pixel 4
SkAutoTDelete<SkMemoryStream> stream(new SkMemoryStream(kHalfWhiteKTX, sizeof(kHalfWhiteKTX)));
REPORTER_ASSERT(reporter, stream);
SkBitmap decodedBitmap;
bool imageDecodeSuccess = SkImageDecoder::DecodeStream(stream, &decodedBitmap);
if (!imageDecodeSuccess) {
ERRORF(reporter, "failed to decode the KTX stream");
return;
}
REPORTER_ASSERT(reporter, decodedBitmap.colorType() == kN32_SkColorType);
REPORTER_ASSERT(reporter, decodedBitmap.alphaType() == kPremul_SkAlphaType);
REPORTER_ASSERT(reporter, decodedBitmap.width() == 2);
REPORTER_ASSERT(reporter, decodedBitmap.height() == 2);
REPORTER_ASSERT(reporter, !(decodedBitmap.empty()));
uint8_t *decodedPixels = reinterpret_cast<uint8_t*>(decodedBitmap.getPixels());
REPORTER_ASSERT(reporter, decodedPixels);
uint8_t *row = decodedPixels;
for (int j = 0; j < decodedBitmap.height(); ++j) {
for (int i = 0; i < decodedBitmap.width(); ++i) {
SkPMColor pixel = *(reinterpret_cast<SkPMColor*>(row + i*sizeof(SkPMColor)));
REPORTER_ASSERT(reporter, SkPreMultiplyARGB(0x80, 0xFF, 0xFF, 0xFF) == pixel);
}
row += decodedBitmap.rowBytes();
}
}
SkPMColor SkPerlinNoiseShader::PerlinNoiseShaderContext::shade(
const SkPoint& point, StitchData& stitchData) const {
SkPoint newPoint;
fMatrix.mapPoints(&newPoint, &point, 1);
newPoint.fX = SkScalarRoundToScalar(newPoint.fX);
newPoint.fY = SkScalarRoundToScalar(newPoint.fY);
U8CPU rgba[4];
for (int channel = 3; channel >= 0; --channel) {
rgba[channel] = SkScalarFloorToInt(255 *
calculateTurbulenceValueForPoint(channel, stitchData, newPoint));
}
return SkPreMultiplyARGB(rgba[3], rgba[0], rgba[1], rgba[2]);
}
void putImageData(ImageData*& source, const IntRect& sourceRect, const IntPoint& destPoint,
const SkBitmap& bitmap, const IntSize& size)
{
ASSERT(sourceRect.width() > 0);
ASSERT(sourceRect.height() > 0);
int originX = sourceRect.x();
int destX = destPoint.x() + sourceRect.x();
ASSERT(destX >= 0);
ASSERT(destX < size.width());
ASSERT(originX >= 0);
ASSERT(originX < sourceRect.right());
int endX = destPoint.x() + sourceRect.right();
ASSERT(endX <= size.width());
int numColumns = endX - destX;
int originY = sourceRect.y();
int destY = destPoint.y() + sourceRect.y();
ASSERT(destY >= 0);
ASSERT(destY < size.height());
ASSERT(originY >= 0);
ASSERT(originY < sourceRect.bottom());
int endY = destPoint.y() + sourceRect.bottom();
ASSERT(endY <= size.height());
int numRows = endY - destY;
ASSERT(bitmap.config() == SkBitmap::kARGB_8888_Config);
SkAutoLockPixels bitmapLock(bitmap);
unsigned srcBytesPerRow = 4 * source->width();
const unsigned char* srcRow = source->data()->data()->data() + originY * srcBytesPerRow + originX * 4;
for (int y = 0; y < numRows; ++y) {
uint32_t* destRow = bitmap.getAddr32(destX, destY + y);
for (int x = 0; x < numColumns; ++x) {
const unsigned char* srcPixel = &srcRow[x * 4];
if (multiplied == Unmultiplied)
destRow[x] = SkPreMultiplyARGB(srcPixel[3], srcPixel[0],
srcPixel[1], srcPixel[2]);
else
destRow[x] = SkPackARGB32(srcPixel[3], srcPixel[0],
srcPixel[1], srcPixel[2]);
}
srcRow += srcBytesPerRow;
}
}
void ImageBuffer::putImageData(ImageData* source, const IntRect& sourceRect,
const IntPoint& destPoint)
{
ASSERT(sourceRect.width() > 0);
ASSERT(sourceRect.height() > 0);
int originx = sourceRect.x();
int destx = destPoint.x() + sourceRect.x();
ASSERT(destx >= 0);
ASSERT(destx < m_size.width());
ASSERT(originx >= 0);
ASSERT(originx < sourceRect.right());
int endx = destPoint.x() + sourceRect.right();
ASSERT(endx <= m_size.width());
int numColumns = endx - destx;
int originy = sourceRect.y();
int desty = destPoint.y() + sourceRect.y();
ASSERT(desty >= 0);
ASSERT(desty < m_size.height());
ASSERT(originy >= 0);
ASSERT(originy < sourceRect.bottom());
int endy = destPoint.y() + sourceRect.bottom();
ASSERT(endy <= m_size.height());
int numRows = endy - desty;
const SkBitmap& bitmap = *context()->platformContext()->bitmap();
ASSERT(bitmap.config() == SkBitmap::kARGB_8888_Config);
SkAutoLockPixels bitmapLock(bitmap);
unsigned srcBytesPerRow = 4 * source->width();
const unsigned char* srcRow = source->data()->data().data() +
originy * srcBytesPerRow + originx * 4;
for (int y = 0; y < numRows; ++y) {
uint32_t* destRow = bitmap.getAddr32(destx, desty + y);
for (int x = 0; x < numColumns; ++x) {
const unsigned char* srcPixel = &srcRow[x * 4];
destRow[x] = SkPreMultiplyARGB(srcPixel[3], srcPixel[0],
srcPixel[1], srcPixel[2]);
}
srcRow += srcBytesPerRow;
}
}
void DragImage::dissolveToFraction(float fraction)
{
m_bitmap.setAlphaType(kPremul_SkAlphaType);
SkAutoLockPixels lock(m_bitmap);
for (int row = 0; row < m_bitmap.height(); ++row) {
for (int column = 0; column < m_bitmap.width(); ++column) {
uint32_t* pixel = m_bitmap.getAddr32(column, row);
*pixel = SkPreMultiplyARGB(
SkColorGetA(*pixel) * fraction,
SkColorGetR(*pixel),
SkColorGetG(*pixel),
SkColorGetB(*pixel));
}
}
}
static SkSwizzler::ResultAlpha swizzle_mask24_to_n32_premul(
void* dstRow, const uint8_t* srcRow, int width, SkMasks* masks) {
// Use the masks to decode to the destination
SkPMColor* dstPtr = (SkPMColor*) dstRow;
INIT_RESULT_ALPHA;
for (int i = 0; i < 3*width; i += 3) {
uint32_t p = srcRow[i] | (srcRow[i + 1] << 8) | srcRow[i + 2] << 16;
uint8_t red = masks->getRed(p);
uint8_t green = masks->getGreen(p);
uint8_t blue = masks->getBlue(p);
uint8_t alpha = masks->getAlpha(p);
UPDATE_RESULT_ALPHA(alpha);
dstPtr[i/3] = SkPreMultiplyARGB(alpha, red, green, blue);
}
return COMPUTE_RESULT_ALPHA;
}
void ImageBuffer::platformTransformColorSpace(const Vector<int>& lookUpTable)
{
const SkBitmap& bitmap = *context()->platformContext()->bitmap();
if (bitmap.isNull())
return;
ASSERT(bitmap.config() == SkBitmap::kARGB_8888_Config);
SkAutoLockPixels bitmapLock(bitmap);
for (int y = 0; y < m_size.height(); ++y) {
uint32_t* srcRow = bitmap.getAddr32(0, y);
for (int x = 0; x < m_size.width(); ++x) {
SkColor color = SkPMColorToColor(srcRow[x]);
srcRow[x] = SkPreMultiplyARGB(SkColorGetA(color),
lookUpTable[SkColorGetR(color)],
lookUpTable[SkColorGetG(color)],
lookUpTable[SkColorGetB(color)]);
}
}
}
static void setBitmapDash(SkPaint* paint, int width) {
SkColor c = paint->getColor();
SkBitmap bm;
bm.allocN32Pixels(2, 1);
bm.lockPixels();
*bm.getAddr32(0, 0) = SkPreMultiplyARGB(0xFF, SkColorGetR(c),
SkColorGetG(c), SkColorGetB(c));
*bm.getAddr32(1, 0) = 0;
bm.unlockPixels();
SkMatrix matrix;
matrix.setScale(SkIntToScalar(width), SK_Scalar1);
SkShader* s = SkShader::CreateBitmapShader(bm, SkShader::kRepeat_TileMode,
SkShader::kClamp_TileMode, &matrix);
paint->setShader(s)->unref();
}
template <bool doSwapRB, AlphaVerb doAlpha> uint32_t convert32(uint32_t c) {
if (doSwapRB) {
c = SkSwizzle_RB(c);
}
// Lucky for us, in both RGBA and BGRA, the alpha component is always in the same place, so
// we can perform premul or unpremul the same way without knowing the swizzles for RGB.
switch (doAlpha) {
case kNothing_AlphaVerb:
// no change
break;
case kPremul_AlphaVerb:
c = SkPreMultiplyARGB(SkGetPackedA32(c), SkGetPackedR32(c),
SkGetPackedG32(c), SkGetPackedB32(c));
break;
case kUnpremul_AlphaVerb:
c = SkUnPreMultiply::UnPreMultiplyPreservingByteOrder(c);
break;
}
return c;
}
DragImageRef dissolveDragImageToFraction(DragImageRef image, float fraction)
{
if (!image)
return 0;
image->bitmap->setIsOpaque(false);
image->bitmap->lockPixels();
for (int row = 0; row < image->bitmap->height(); ++row) {
for (int column = 0; column < image->bitmap->width(); ++column) {
uint32_t* pixel = image->bitmap->getAddr32(column, row);
*pixel = SkPreMultiplyARGB(SkColorGetA(*pixel) * fraction,
SkColorGetR(*pixel),
SkColorGetG(*pixel),
SkColorGetB(*pixel));
}
}
image->bitmap->unlockPixels();
return image;
}
bool SkPNGImageDecoder::onDecode(SkStream* sk_stream, SkBitmap* decodedBitmap,
SkBitmap::Config prefConfig, Mode mode) {
// SkAutoTrace apr("SkPNGImageDecoder::onDecode");
/* Create and initialize the png_struct with the desired error handler
* functions. If you want to use the default stderr and longjump method,
* you can supply NULL for the last three parameters. We also supply the
* the compiler header file version, so that we know if the application
* was compiled with a compatible version of the library. */
png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
NULL, sk_error_fn, NULL);
// png_voidp user_error_ptr, user_error_fn, user_warning_fn);
if (png_ptr == NULL) {
return false;
}
/* Allocate/initialize the memory for image information. */
png_infop info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL) {
png_destroy_read_struct(&png_ptr, png_infopp_NULL, png_infopp_NULL);
return false;
}
PNGAutoClean autoClean(png_ptr, info_ptr);
/* Set error handling if you are using the setjmp/longjmp method (this is
* the normal method of doing things with libpng). REQUIRED unless you
* set up your own error handlers in the png_create_read_struct() earlier.
*/
if (setjmp(png_jmpbuf(png_ptr))) {
return false;
}
/* If you are using replacement read functions, instead of calling
* png_init_io() here you would call:
*/
png_set_read_fn(png_ptr, (void *)sk_stream, sk_read_fn);
/* where user_io_ptr is a structure you want available to the callbacks */
/* If we have already read some of the signature */
// png_set_sig_bytes(png_ptr, 0 /* sig_read */ );
// hookup our peeker so we can see any user-chunks the caller may be interested in
png_set_keep_unknown_chunks(png_ptr, PNG_HANDLE_CHUNK_ALWAYS, (png_byte*)"", 0);
if (this->getPeeker()) {
png_set_read_user_chunk_fn(png_ptr, (png_voidp)this->getPeeker(), sk_read_user_chunk);
}
/* The call to png_read_info() gives us all of the information from the
* PNG file before the first IDAT (image data chunk). */
png_read_info(png_ptr, info_ptr);
png_uint_32 origWidth, origHeight;
int bit_depth, color_type, interlace_type;
png_get_IHDR(png_ptr, info_ptr, &origWidth, &origHeight, &bit_depth, &color_type,
&interlace_type, int_p_NULL, int_p_NULL);
SkBitmap::Config config;
bool hasAlpha = false;
bool doDither = this->getDitherImage();
// check for sBIT chunk data, in case we should disable dithering because
// our data is not truely 8bits per component
if (doDither) {
#if 0
SkDebugf("----- sBIT %d %d %d %d\n", info_ptr->sig_bit.red,
info_ptr->sig_bit.green, info_ptr->sig_bit.blue,
info_ptr->sig_bit.alpha);
#endif
// 0 seems to indicate no information available
if (pos_le(info_ptr->sig_bit.red, SK_R16_BITS) &&
pos_le(info_ptr->sig_bit.green, SK_G16_BITS) &&
pos_le(info_ptr->sig_bit.blue, SK_B16_BITS)) {
doDither = false;
}
}
if (color_type == PNG_COLOR_TYPE_PALETTE) {
config = SkBitmap::kIndex8_Config; // defer sniffing for hasAlpha
} else {
png_color_16p transColor;
png_get_tRNS(png_ptr, info_ptr, NULL, NULL, &transColor);
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS) ||
PNG_COLOR_TYPE_RGB_ALPHA == color_type ||
PNG_COLOR_TYPE_GRAY_ALPHA == color_type) {
hasAlpha = true;
config = SkBitmap::kARGB_8888_Config;
} else { // we get to choose the config
config = prefConfig;
if (config == SkBitmap::kNo_Config) {
config = SkImageDecoder::GetDeviceConfig();
}
if (config != SkBitmap::kRGB_565_Config &&
config != SkBitmap::kARGB_4444_Config) {
config = SkBitmap::kARGB_8888_Config;
}
}
}
if (!this->chooseFromOneChoice(config, origWidth, origHeight)) {
return false;
}
const int sampleSize = this->getSampleSize();
SkScaledBitmapSampler sampler(origWidth, origHeight, sampleSize);
decodedBitmap->setConfig(config, sampler.scaledWidth(),
sampler.scaledHeight(), 0);
if (SkImageDecoder::kDecodeBounds_Mode == mode) {
return true;
}
// from here down we are concerned with colortables and pixels
/* tell libpng to strip 16 bit/color files down to 8 bits/color */
if (bit_depth == 16) {
png_set_strip_16(png_ptr);
}
/* Extract multiple pixels with bit depths of 1, 2, and 4 from a single
* byte into separate bytes (useful for paletted and grayscale images). */
if (bit_depth < 8) {
png_set_packing(png_ptr);
}
/* Expand grayscale images to the full 8 bits from 1, 2, or 4 bits/pixel */
if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) {
png_set_gray_1_2_4_to_8(png_ptr);
}
/* Make a grayscale image into RGB. */
if (color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
png_set_gray_to_rgb(png_ptr);
}
// we track if we actually see a non-opaque pixels, since sometimes a PNG sets its colortype
// to |= PNG_COLOR_MASK_ALPHA, but all of its pixels are in fact opaque. We care, since we
// draw lots faster if we can flag the bitmap has being opaque
bool reallyHasAlpha = false;
SkColorTable* colorTable = NULL;
if (color_type == PNG_COLOR_TYPE_PALETTE) {
int num_palette;
png_colorp palette;
png_bytep trans;
int num_trans;
png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette);
/* BUGGY IMAGE WORKAROUND
We hit some images (e.g. fruit_.png) who contain bytes that are == colortable_count
which is a problem since we use the byte as an index. To work around this we grow
the colortable by 1 (if its < 256) and duplicate the last color into that slot.
*/
int colorCount = num_palette + (num_palette < 256);
colorTable = SkNEW_ARGS(SkColorTable, (colorCount));
SkPMColor* colorPtr = colorTable->lockColors();
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
png_get_tRNS(png_ptr, info_ptr, &trans, &num_trans, NULL);
hasAlpha = (num_trans > 0);
} else {
num_trans = 0;
colorTable->setFlags(colorTable->getFlags() | SkColorTable::kColorsAreOpaque_Flag);
}
// check for bad images that might make us crash
if (num_trans > num_palette) {
num_trans = num_palette;
}
int index = 0;
int transLessThanFF = 0;
for (; index < num_trans; index++) {
transLessThanFF |= (int)*trans - 0xFF;
*colorPtr++ = SkPreMultiplyARGB(*trans++, palette->red, palette->green, palette->blue);
palette++;
}
reallyHasAlpha |= (transLessThanFF < 0);
for (; index < num_palette; index++) {
*colorPtr++ = SkPackARGB32(0xFF, palette->red, palette->green, palette->blue);
palette++;
}
// see BUGGY IMAGE WORKAROUND comment above
if (num_palette < 256) {
*colorPtr = colorPtr[-1];
}
colorTable->unlockColors(true);
}
SkAutoUnref aur(colorTable);
if (!this->allocPixelRef(decodedBitmap, colorTable)) {
delete colorTable;
return false;
}
SkAutoLockPixels alp(*decodedBitmap);
/* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */
// if (color_type == PNG_COLOR_TYPE_RGB_ALPHA)
// ; // png_set_swap_alpha(png_ptr);
/* swap bytes of 16 bit files to least significant byte first */
// png_set_swap(png_ptr);
/* Add filler (or alpha) byte (before/after each RGB triplet) */
if (color_type == PNG_COLOR_TYPE_RGB || color_type == PNG_COLOR_TYPE_GRAY) {
png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER);
}
/* Turn on interlace handling. REQUIRED if you are not using
* png_read_image(). To see how to handle interlacing passes,
* see the png_read_row() method below:
*/
const int number_passes = interlace_type != PNG_INTERLACE_NONE ?
png_set_interlace_handling(png_ptr) : 1;
/* Optional call to gamma correct and add the background to the palette
* and update info structure. REQUIRED if you are expecting libpng to
* update the palette for you (ie you selected such a transform above).
*/
png_read_update_info(png_ptr, info_ptr);
if (SkBitmap::kIndex8_Config == config && 1 == sampleSize) {
for (int i = 0; i < number_passes; i++) {
for (png_uint_32 y = 0; y < origHeight; y++) {
uint8_t* bmRow = decodedBitmap->getAddr8(0, y);
png_read_rows(png_ptr, &bmRow, png_bytepp_NULL, 1);
}
}
} else {
SkScaledBitmapSampler::SrcConfig sc;
int srcBytesPerPixel = 4;
if (SkBitmap::kIndex8_Config == config) {
sc = SkScaledBitmapSampler::kIndex;
srcBytesPerPixel = 1;
} else if (hasAlpha) {
sc = SkScaledBitmapSampler::kRGBA;
} else {
sc = SkScaledBitmapSampler::kRGBX;
}
SkAutoMalloc storage(origWidth * srcBytesPerPixel);
const int height = decodedBitmap->height();
for (int i = 0; i < number_passes; i++) {
if (!sampler.begin(decodedBitmap, sc, doDither)) {
return false;
}
uint8_t* srcRow = (uint8_t*)storage.get();
skip_src_rows(png_ptr, srcRow, sampler.srcY0());
for (int y = 0; y < height; y++) {
uint8_t* tmp = srcRow;
png_read_rows(png_ptr, &tmp, png_bytepp_NULL, 1);
reallyHasAlpha |= sampler.next(srcRow);
if (y < height - 1) {
skip_src_rows(png_ptr, srcRow, sampler.srcDY() - 1);
}
}
// skip the rest of the rows (if any)
png_uint_32 read = (height - 1) * sampler.srcDY() +
sampler.srcY0() + 1;
SkASSERT(read <= origHeight);
skip_src_rows(png_ptr, srcRow, origHeight - read);
}
if (hasAlpha && !reallyHasAlpha) {
SkDEBUGF(("Image doesn't really have alpha [%d %d]\n",
origWidth, origHeight));
}
}
/* read rest of file, and get additional chunks in info_ptr - REQUIRED */
png_read_end(png_ptr, info_ptr);
decodedBitmap->setIsOpaque(!reallyHasAlpha);
return true;
}
DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ApplyGamma, reporter, ctxInfo) {
GrContext* context = ctxInfo.grContext();
static const int kW = 256;
static const int kH = 256;
static const size_t kRowBytes = sizeof(uint32_t) * kW;
GrSurfaceDesc baseDesc;
baseDesc.fConfig = kRGBA_8888_GrPixelConfig;
baseDesc.fWidth = kW;
baseDesc.fHeight = kH;
const SkImageInfo ii = SkImageInfo::MakeN32Premul(kW, kH);
SkAutoTMalloc<uint32_t> srcPixels(kW * kH);
for (int y = 0; y < kH; ++y) {
for (int x = 0; x < kW; ++x) {
srcPixels.get()[y*kW+x] = SkPreMultiplyARGB(x, y, x, 0xFF);
}
}
SkBitmap bm;
bm.installPixels(ii, srcPixels.get(), kRowBytes);
SkAutoTMalloc<uint32_t> read(kW * kH);
// We allow more error on GPUs with lower precision shader variables.
float error = context->caps()->shaderCaps()->floatPrecisionVaries() ? 1.2f : 0.5f;
for (auto toSRGB : { false, true }) {
sk_sp<SkSurface> dst(SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, ii));
if (!dst) {
ERRORF(reporter, "Could not create surfaces for copy surface test.");
continue;
}
SkCanvas* dstCanvas = dst->getCanvas();
dstCanvas->clear(SK_ColorRED);
dstCanvas->flush();
SkPaint gammaPaint;
gammaPaint.setBlendMode(SkBlendMode::kSrc);
gammaPaint.setColorFilter(toSRGB ? SkColorFilter::MakeLinearToSRGBGamma()
: SkColorFilter::MakeSRGBToLinearGamma());
dstCanvas->drawBitmap(bm, 0, 0, &gammaPaint);
dstCanvas->flush();
sk_memset32(read.get(), 0, kW * kH);
if (!dstCanvas->readPixels(ii, read.get(), kRowBytes, 0, 0)) {
ERRORF(reporter, "Error calling readPixels");
continue;
}
bool abort = false;
// Validate that pixels were copied/transformed correctly.
for (int y = 0; y < kH && !abort; ++y) {
for (int x = 0; x < kW && !abort; ++x) {
uint32_t r = read.get()[y * kW + x];
uint32_t s = srcPixels.get()[y * kW + x];
uint32_t expected;
if (!check_gamma(s, r, toSRGB, error, &expected)) {
ERRORF(reporter, "Expected dst %d,%d to contain 0x%08x "
"from src 0x%08x and mode %s. Got %08x", x, y, expected, s,
toSRGB ? "ToSRGB" : "ToLinear", r);
abort = true;
break;
}
}
}
}
}
