diff options
Diffstat (limited to 'gfx/cairo/cairo/src/cairo-png.c')
| -rw-r--r-- | gfx/cairo/cairo/src/cairo-png.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/gfx/cairo/cairo/src/cairo-png.c b/gfx/cairo/cairo/src/cairo-png.c index f576047b19..63e3c4cdbd 100644 --- a/gfx/cairo/cairo/src/cairo-png.c +++ b/gfx/cairo/cairo/src/cairo-png.c @@ -407,6 +407,14 @@ write_png (cairo_surface_t *surface, */ png_write_info (png, info); +#ifndef WORDS_BIGENDIAN + /* libpng treats 16-bit data as big-endian by default. Swapping the + * byte-order on little endian ensures the native-endian data can be + * provided to png_write_image. This does not affect 8-bit data. + */ + png_set_swap (png); +#endif + if (png_color_type == PNG_COLOR_TYPE_RGB_ALPHA) { if (clone->format != CAIRO_FORMAT_RGBA128F) png_set_write_user_transform_fn (png, unpremultiply_data); @@ -561,7 +569,6 @@ cairo_surface_write_to_png_stream (cairo_surface_t *surface, return write_png (surface, stream_write_func, &png_closure); } -slim_hidden_def (cairo_surface_write_to_png_stream); static inline int multiply_alpha (int alpha, int color) @@ -702,6 +709,14 @@ read_png (struct png_read_closure_t *png_closure) png_read_info (png, info); +#ifndef WORDS_BIGENDIAN + /* libpng treats 16-bit data as big-endian by default. Swapping the + * byte-order on little endian ensures the native-endian data can be + * provided to png_read_image. This does not affect 8-bit data. + */ + png_set_swap (png); +#endif + png_get_IHDR (png, info, &png_width, &png_height, &depth, &color_type, &interlace, NULL, NULL); |