/// Expand the colormap from RGB to Packed ARGB as needed by Cairo.
/// And apply any LCMS transformation.
static void
ConvertColormap(uint32_t* aColormap, uint32_t aColors)
{
// Apply CMS transformation if enabled and available
if (gfxPlatform::GetCMSMode() == eCMSMode_All) {
qcms_transform* transform = gfxPlatform::GetCMSRGBTransform();
if (transform) {
qcms_transform_data(transform, aColormap, aColormap, aColors);
}
}
// Convert from the GIF's RGB format to the Cairo format.
// Work from end to begin, because of the in-place expansion
uint8_t* from = ((uint8_t*)aColormap) + 3 * aColors;
uint32_t* to = aColormap + aColors;
// Convert color entries to Cairo format
// set up for loops below
if (!aColors) {
return;
}
uint32_t c = aColors;
// copy as bytes until source pointer is 32-bit-aligned
// NB: can't use 32-bit reads, they might read off the end of the buffer
for (; (NS_PTR_TO_UINT32(from) & 0x3) && c; --c) {
from -= 3;
*--to = gfxPackedPixel(0xFF, from[0], from[1], from[2]);
}
// bulk copy of pixels.
while (c >= 4) {
from -= 12;
to -= 4;
c -= 4;
GFX_BLOCK_RGB_TO_FRGB(from,to);
}
// copy remaining pixel(s)
// NB: can't use 32-bit reads, they might read off the end of the buffer
while (c--) {
from -= 3;
*--to = gfxPackedPixel(0xFF, from[0], from[1], from[2]);
}
}
void
nsJPEGDecoder::OutputScanlines(bool* suspend)
{
*suspend = false;
const uint32_t top = mInfo.output_scanline;
while ((mInfo.output_scanline < mInfo.output_height)) {
// Use the Cairo image buffer as scanline buffer
uint32_t* imageRow = ((uint32_t*)mImageData) +
(mInfo.output_scanline * mInfo.output_width);
if (mInfo.out_color_space == MOZ_JCS_EXT_NATIVE_ENDIAN_XRGB) {
// Special case: scanline will be directly converted into packed ARGB
if (jpeg_read_scanlines(&mInfo, (JSAMPARRAY)&imageRow, 1) != 1) {
*suspend = true; // suspend
break;
}
continue; // all done for this row!
}
JSAMPROW sampleRow = (JSAMPROW)imageRow;
if (mInfo.output_components == 3) {
// Put the pixels at end of row to enable in-place expansion
sampleRow += mInfo.output_width;
}
// Request one scanline. Returns 0 or 1 scanlines.
if (jpeg_read_scanlines(&mInfo, &sampleRow, 1) != 1) {
*suspend = true; // suspend
break;
}
if (mTransform) {
JSAMPROW source = sampleRow;
if (mInfo.out_color_space == JCS_GRAYSCALE) {
// Convert from the 1byte grey pixels at begin of row
// to the 3byte RGB byte pixels at 'end' of row
sampleRow += mInfo.output_width;
}
qcms_transform_data(mTransform, source, sampleRow, mInfo.output_width);
// Move 3byte RGB data to end of row
if (mInfo.out_color_space == JCS_CMYK) {
memmove(sampleRow + mInfo.output_width,
sampleRow,
3 * mInfo.output_width);
sampleRow += mInfo.output_width;
}
} else {
if (mInfo.out_color_space == JCS_CMYK) {
// Convert from CMYK to RGB
// We cannot convert directly to Cairo, as the CMSRGBTransform
// may wants to do a RGB transform...
// Would be better to have platform CMSenabled transformation
// from CMYK to (A)RGB...
cmyk_convert_rgb((JSAMPROW)imageRow, mInfo.output_width);
sampleRow += mInfo.output_width;
}
if (mCMSMode == eCMSMode_All) {
// No embedded ICC profile - treat as sRGB
qcms_transform* transform = gfxPlatform::GetCMSRGBTransform();
if (transform) {
qcms_transform_data(transform, sampleRow, sampleRow,
mInfo.output_width);
}
}
}
// counter for while() loops below
uint32_t idx = mInfo.output_width;
// copy as bytes until source pointer is 32-bit-aligned
for (; (NS_PTR_TO_UINT32(sampleRow) & 0x3) && idx; --idx) {
*imageRow++ = gfxPackedPixel(0xFF, sampleRow[0], sampleRow[1],
sampleRow[2]);
sampleRow += 3;
}
// copy pixels in blocks of 4
while (idx >= 4) {
GFX_BLOCK_RGB_TO_FRGB(sampleRow, imageRow);
idx -= 4;
sampleRow += 12;
imageRow += 4;
}
// copy remaining pixel(s)
while (idx--) {
// 32-bit read of final pixel will exceed buffer, so read bytes
*imageRow++ = gfxPackedPixel(0xFF, sampleRow[0], sampleRow[1],
sampleRow[2]);
sampleRow += 3;
}
}
if (top != mInfo.output_scanline) {
nsIntRect r(0, top, mInfo.output_width, mInfo.output_scanline-top);
PostInvalidation(r);
}
}
void
nsPNGDecoder::row_callback(png_structp png_ptr, png_bytep new_row,
png_uint_32 row_num, int pass)
{
/* libpng comments:
*
* this function is called for every row in the image. If the
* image is interlacing, and you turned on the interlace handler,
* this function will be called for every row in every pass.
* Some of these rows will not be changed from the previous pass.
* When the row is not changed, the new_row variable will be
* nullptr. The rows and passes are called in order, so you don't
* really need the row_num and pass, but I'm supplying them
* because it may make your life easier.
*
* For the non-nullptr rows of interlaced images, you must call
* png_progressive_combine_row() passing in the row and the
* old row. You can call this function for nullptr rows (it will
* just return) and for non-interlaced images (it just does the
* memcpy for you) if it will make the code easier. Thus, you
* can just do this for all cases:
*
* png_progressive_combine_row(png_ptr, old_row, new_row);
*
* where old_row is what was displayed for previous rows. Note
* that the first pass (pass == 0 really) will completely cover
* the old row, so the rows do not have to be initialized. After
* the first pass (and only for interlaced images), you will have
* to pass the current row, and the function will combine the
* old row and the new row.
*/
nsPNGDecoder* decoder =
static_cast<nsPNGDecoder*>(png_get_progressive_ptr(png_ptr));
// skip this frame
if (decoder->mFrameIsHidden) {
return;
}
if (row_num >= (png_uint_32) decoder->mFrameRect.height) {
return;
}
if (new_row) {
int32_t width = decoder->mFrameRect.width;
uint32_t iwidth = decoder->mFrameRect.width;
png_bytep line = new_row;
if (decoder->interlacebuf) {
line = decoder->interlacebuf + (row_num * decoder->mChannels * width);
png_progressive_combine_row(png_ptr, line, new_row);
}
uint32_t bpr = width * sizeof(uint32_t);
uint32_t* cptr32 = (uint32_t*)(decoder->mImageData + (row_num*bpr));
if (decoder->mTransform) {
if (decoder->mCMSLine) {
qcms_transform_data(decoder->mTransform, line, decoder->mCMSLine,
iwidth);
// copy alpha over
uint32_t channels = decoder->mChannels;
if (channels == 2 || channels == 4) {
for (uint32_t i = 0; i < iwidth; i++)
decoder->mCMSLine[4 * i + 3] = line[channels * i + channels - 1];
}
line = decoder->mCMSLine;
} else {
qcms_transform_data(decoder->mTransform, line, line, iwidth);
}
}
switch (decoder->format) {
case gfx::SurfaceFormat::B8G8R8X8: {
// counter for while() loops below
uint32_t idx = iwidth;
// copy as bytes until source pointer is 32-bit-aligned
for (; (NS_PTR_TO_UINT32(line) & 0x3) && idx; --idx) {
*cptr32++ = gfxPackedPixel(0xFF, line[0], line[1], line[2]);
line += 3;
}
// copy pixels in blocks of 4
while (idx >= 4) {
GFX_BLOCK_RGB_TO_FRGB(line, cptr32);
idx -= 4;
line += 12;
cptr32 += 4;
}
// copy remaining pixel(s)
while (idx--) {
// 32-bit read of final pixel will exceed buffer, so read bytes
*cptr32++ = gfxPackedPixel(0xFF, line[0], line[1], line[2]);
line += 3;
}
}
break;
case gfx::SurfaceFormat::B8G8R8A8: {
if (!decoder->mDisablePremultipliedAlpha) {
for (uint32_t x=width; x>0; --x) {
*cptr32++ = gfxPackedPixel(line[3], line[0], line[1], line[2]);
line += 4;
}
} else {
for (uint32_t x=width; x>0; --x) {
*cptr32++ = gfxPackedPixelNoPreMultiply(line[3], line[0], line[1],
line[2]);
line += 4;
}
}
}
break;
default:
png_longjmp(decoder->mPNG, 1);
}
if (decoder->mNumFrames <= 1) {
// Only do incremental image display for the first frame
// XXXbholley - this check should be handled in the superclass
nsIntRect r(0, row_num, width, 1);
decoder->PostInvalidation(r);
}
}
}