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Update info structures after doing transformations, thus fixing bug 

Also stopped applying sBIT. Scream if this hurts you :)
This commit is contained in:
Nick Lamb /GIMP 1999-09-13 00:57:52 +00:00
parent 4d1bb0d749
commit 7633468a5f
1 changed files with 23 additions and 12 deletions
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35
plug-ins/common/png.c
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@ -54,7 +54,7 @@
* Constants...
*/
#define PLUG_IN_VERSION "1.1.6 - 17 May 1998"
#define PLUG_IN_VERSION "1.1.8 - 8 Sep 1999"
#define SCALE_WIDTH 125
#define DEFAULT_GAMMA 2.20
@ -298,7 +298,7 @@ load_image(char *filename) /* I - File to load */
end, /* Ending tile row */
num; /* Number of rows to load */
FILE *fp; /* File pointer */
gint32 image, /* Image */
gint32 image = -1, /* Image */
layer; /* Layer */
GDrawable *drawable; /* Drawable for layer */
GPixelRgn pixel_rgn; /* Pixel region for layer */
@ -331,13 +331,22 @@ load_image(char *filename) /* I - File to load */
info = (png_infop)calloc(sizeof(png_info), 1);
#endif /* PNG_LIBPNG_VER > 88 */
if (setjmp(pp->jmpbuf))
{
g_message("%s\nPNG error. File corrupted?", filename);
return image;
}
/*
* Open the file and initialize the PNG read "engine"...
*/
fp = fopen(filename, "rb");
if (fp == NULL)
return (-1);
if (fp == NULL) {
g_message("%s\nis not present or is unreadable", filename);
gimp_quit();
}
png_init_io(pp, fp);
@ -355,19 +364,15 @@ load_image(char *filename) /* I - File to load */
png_read_info(pp, info);
/*
* I have no idea why this used to be the way it was, luckily
* most people don't use 2bit or 4bit indexed images with PNG
* Hopefully this is now fixed once and for all, please tell me if you
* have any problems with <8-bit images -- njl195@zepler.org.uk
*/
if (info->bit_depth < 8)
{
png_set_packing(pp);
if (info->color_type != PNG_COLOR_TYPE_PALETTE) {
if (info->color_type != PNG_COLOR_TYPE_PALETTE)
png_set_expand(pp);
if (info->valid & PNG_INFO_sBIT)
png_set_shift(pp, &(info->sig_bit));
}
}
else if (info->bit_depth == 16)
png_set_strip_16(pp);
@ -380,6 +385,12 @@ load_image(char *filename) /* I - File to load */
num_passes = png_set_interlace_handling(pp);
else
num_passes = 1;
/*
* Update the info structures after the transformations take effect
*/
png_read_update_info(pp, info);
switch (info->color_type)
{
@ -417,7 +428,7 @@ load_image(char *filename) /* I - File to load */
image = gimp_image_new(info->width, info->height, image_type);
if (image == -1)
{
g_print("can't allocate new image\n");
g_message("Can't allocate new image\n%s", filename);
gimp_quit();
};