mewin/libpng
1
0
Fork 0
mirror of https://git.code.sf.net/p/libpng/code.git synced 2025-07-10 18:04:09 +02:00
Code Issues Projects Releases Wiki Activity

[alpha] Revised some comments in pngrtran.c

Browse Source
This commit is contained in:
Glenn Randers-Pehrson
2009-11-28 20:49:13 -06:00
parent 7aa2927db0
commit 7ce8e2e8ad
1 changed files with 9 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
pngrtran.c
View File

@@ -1533,14 +1533,16 @@ png_do_read_transformations(png_structp png_ptr)
/* TO DO: build 16-bit gamma tables */
/* TO DO: expand pixels to 16 bits either here or (better) inside
* png_do_read_premultiply_alpha
*/
if (png_ptr->transformations & PNG_PREMULTIPLY_ALPHA)
png_do_read_premultiply_alpha(&(png_ptr->row_info),
png_ptr->row_buf + 1);
/* TO DO: apply png_ptr->gamma_premultiply to the premultiplied
* samples, using the 16-bit gamma table. We may need to set
* png_ptr->screen_gamma to our output gamma, even though it is
* not necessarily destined to a screen.
*/
# ifdef PNG_READ_16_TO_8_SUPPORTED
if (!(png_ptr->transformations & PNG_PREMULTIPLY_ALPHA))
{
@@ -1549,11 +1551,6 @@ png_do_read_transformations(png_structp png_ptr)
}
# endif
/* TO DO: apply png_ptr->gamma_premultiply to the premultiplied
* samples, using either the 8-bit or 16-bit gamma table as
* appropriate.
*/
#endif
#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
@@ -1562,11 +1559,13 @@ png_do_read_transformations(png_structp png_ptr)
#endif
#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
/* Convert from RGBA to ARGB */
if (png_ptr->transformations & PNG_SWAP_ALPHA)
png_do_read_swap_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
#endif
#ifdef PNG_READ_SWAP_SUPPORTED
/* Swaps byte order on 16 bit depth images */
if (png_ptr->transformations & PNG_SWAP_BYTES)
png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1);
#endif
@@ -2047,9 +2046,7 @@ void /* PRIVATE */
png_do_read_premultiply_alpha(png_row_infop row_info, png_bytep row)
{
/* TO DO: expand to 16 bits, then apply gamma
* before premultiply
*/
/* TO DO: apply gamma before premultiply */
png_debug(1, "in png_do_read_premultiply_alpha");