python-pillow/Pillow
1
1
Fork 0
mirror of https://github.com/python-pillow/Pillow.git synced 2025-07-16 03:02:22 +03:00
Code Issues Packages Projects Releases Wiki Activity

unify reading of YCbCr Tiffs

Browse Source
This commit is contained in:
Konstantin Kopachev 2021-01-11 23:28:58 -08:00 committed by Eric Soroos
parent 4c2dfadf26
commit 4dd288c66c
1 changed files with 136 additions and 155 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

99
src/libImaging/TiffDecode.c
View File

@ -213,24 +213,34 @@ ImagingLibTiffInit(ImagingCodecState state, int fp, uint32 offset) {
}
int
_decodeStripYCbCr(Imaging im, ImagingCodecState state, TIFF *tiff) {
_decodeYCbCr(Imaging im, ImagingCodecState state, TIFF *tiff) {
// To avoid dealing with YCbCr subsampling, let libtiff handle it
// Use a TIFFRGBAImage wrapping the tiff image, and let libtiff handle
// all of the conversion. Metadata read from the TIFFRGBAImage could
// be different from the metadata that the base tiff returns.
INT32 strip_row;
INT32 current_row;
UINT8 *new_data;
UINT32 rows_per_strip, row_byte_size, rows_to_read;
UINT32 rows_per_block, row_byte_size, rows_to_read;
int ret;
TIFFRGBAImage img;
char emsg[1024] = "";
ret = TIFFGetFieldDefaulted(tiff, TIFFTAG_ROWSPERSTRIP, &rows_per_strip);
if (ret != 1) {
rows_per_strip = state->ysize;
// Since using TIFFRGBAImage* functions, we can read whole tiff into rastrr in one call
// Let's select smaller block size. Multiplying image width by (tile length OR rows per strip)
// gives us manageable block size in pixels
if (TIFFIsTiled(tiff)) {
ret = TIFFGetFieldDefaulted(tiff, TIFFTAG_TILELENGTH, &rows_per_block);
}
TRACE(("RowsPerStrip: %u \n", rows_per_strip));
else {
ret = TIFFGetFieldDefaulted(tiff, TIFFTAG_ROWSPERSTRIP, &rows_per_block);
}
if (ret != 1) {
rows_per_block = state->ysize;
}
TRACE(("RowsPerBlock: %u \n", rows_per_block));
if (!(TIFFRGBAImageOK(tiff, emsg) && TIFFRGBAImageBegin(&img, tiff, 0, emsg))) {
TRACE(("Decode error, msg: %s", emsg));
@ -263,14 +273,14 @@ _decodeStripYCbCr(Imaging im, ImagingCodecState state, TIFF *tiff) {
row_byte_size = img.width * 4;
/* overflow check for realloc */
if (INT_MAX / row_byte_size < rows_per_strip) {
if (INT_MAX / row_byte_size < rows_per_block) {
state->errcode = IMAGING_CODEC_MEMORY;
goto decodeycbcr_err;
}
state->bytes = rows_per_strip * row_byte_size;
state->bytes = rows_per_block * row_byte_size;
TRACE(("StripSize: %d \n", state->bytes));
TRACE(("BlockSize: %d \n", state->bytes));
/* realloc to fit whole strip */
/* malloc check above */
@ -282,9 +292,9 @@ _decodeStripYCbCr(Imaging im, ImagingCodecState state, TIFF *tiff) {
state->buffer = new_data;
for (; state->y < state->ysize; state->y += rows_per_strip) {
for (; state->y < state->ysize; state->y += rows_per_block) {
img.row_offset = state->y;
rows_to_read = min(rows_per_strip, img.height - state->y);
rows_to_read = min(rows_per_block, img.height - state->y);
if (!TIFFRGBAImageGet(&img, (UINT32 *)state->buffer, img.width, rows_to_read)) {
TRACE(("Decode Error, y: %d\n", state->y));
@ -299,19 +309,19 @@ _decodeStripYCbCr(Imaging im, ImagingCodecState state, TIFF *tiff) {
TRACE(("Decoded strip for row %d \n", state->y));
// iterate over each row in the strip and stuff data into image
for (strip_row = 0;
strip_row < min((INT32)rows_per_strip, state->ysize - state->y);
strip_row++) {
TRACE(("Writing data into line %d ; \n", state->y + strip_row));
for (current_row = 0;
current_row < min((INT32)rows_per_block, state->ysize - state->y);
current_row++) {
TRACE(("Writing data into line %d ; \n", state->y + current_row));
// UINT8 * bbb = state->buffer + strip_row * (state->bytes /
// rows_per_strip); TRACE(("chars: %x %x %x %x\n", ((UINT8 *)bbb)[0],
// UINT8 * bbb = state->buffer + current_row * (state->bytes /
// rows_per_block); TRACE(("chars: %x %x %x %x\n", ((UINT8 *)bbb)[0],
// ((UINT8 *)bbb)[1], ((UINT8 *)bbb)[2], ((UINT8 *)bbb)[3]));
state->shuffle(
(UINT8 *)im->image[state->y + state->yoff + strip_row] +
(UINT8 *)im->image[state->y + state->yoff + current_row] +
state->xoff * im->pixelsize,
state->buffer + strip_row * row_byte_size,
state->buffer + current_row * row_byte_size,
state->xsize);
}
}
@ -525,6 +535,10 @@ ImagingLibTiffDecode(
isYCbCr = 0;
}
if (isYCbCr) {
_decodeYCbCr(im, state, tiff);
}
else {
// YCbCr data is read as RGB by libtiff and we don't need to worry about planar storage in that case
// if number of bands is 1, there is no difference with contig case
if (planarconfig == PLANARCONFIG_SEPARATE &&
@ -568,17 +582,9 @@ ImagingLibTiffDecode(
goto decode_err;
}
if (isYCbCr) {
row_byte_size = tile_width * 4;
/* sanity check, we use this value in shuffle below */
if (im->pixelsize != 4) {
state->errcode = IMAGING_CODEC_BROKEN;
goto decode_err;
}
} else {
// We could use TIFFTileSize, but for YCbCr data it returns subsampled data size
// We could use TIFFTileSize, but for YCbCr data it returns subsampled data
// size
row_byte_size = (tile_width * state->bits / planes + 7) / 8;
}
/* overflow check for realloc */
if (INT_MAX / row_byte_size < tile_length) {
@ -589,7 +595,8 @@ ImagingLibTiffDecode(
state->bytes = row_byte_size * tile_length;
if (TIFFTileSize(tiff) > state->bytes) {
// If the tile size as expected by LibTiff isn't what we're expecting, abort.
// If the tile size as expected by LibTiff isn't what we're expecting,
// abort.
state->errcode = IMAGING_CODEC_MEMORY;
goto decode_err;
}
@ -620,24 +627,11 @@ ImagingLibTiffDecode(
state->errcode = IMAGING_CODEC_BROKEN;
goto decode_err;
}
if (isYCbCr) {
/* To avoid dealing with YCbCr subsampling, let libtiff handle it */
if (!TIFFReadRGBATile(tiff, x, y, (UINT32 *)state->buffer)) {
TRACE(("Decode Error, Tile at %dx%d\n", x, y));
state->errcode = IMAGING_CODEC_BROKEN;
goto decode_err;
}
#if WORDS_BIGENDIAN
TIFFSwabArrayOfLong((UINT32 *)state->buffer, tile_width * tile_length);
#endif
} else {
if (TIFFReadTile(tiff, (tdata_t)state->buffer, x, y, 0, plane) == -1) {
TRACE(("Decode Error, Tile at %dx%d\n", x, y));
state->errcode = IMAGING_CODEC_BROKEN;
goto decode_err;
}
}
TRACE(("Read tile at %dx%d; \n\n", x, y));
@ -649,18 +643,8 @@ ImagingLibTiffDecode(
// UINT8 * bbb = state->buffer + tile_y * row_byte_size;
// TRACE(("chars: %x%x%x%x\n", ((UINT8 *)bbb)[0], ((UINT8 *)bbb)[1], ((UINT8 *)bbb)[2], ((UINT8 *)bbb)[3]));
/*
* For some reason the TIFFReadRGBATile() function
* chooses the lower left corner as the origin.
* Vertically mirror by shuffling the scanlines
* backwards
*/
if (isYCbCr) {
current_line = tile_length - tile_y - 1;
} else {
current_line = tile_y;
}
shuffler((UINT8*) im->image[tile_y + y] + x * im->pixelsize,
state->buffer + current_line * row_byte_size,
@ -670,13 +654,9 @@ ImagingLibTiffDecode(
}
}
}
} else {
if (!isYCbCr) {
_decodeStrip(im, state, tiff, planes, unpackers);
}
else {
_decodeStripYCbCr(im, state, tiff);
}
_decodeStrip(im, state, tiff, planes, unpackers);
}
if (!state->errcode) {
@ -703,6 +683,7 @@ ImagingLibTiffDecode(
}
}
}
}
decode_err:
TIFFClose(tiff);