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gr-utils: loadpng: make it handle indexed PNGs

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This commit is contained in:
Vince Weaver 2017-07-26 23:55:00 -04:00
parent 4841c64ca7
commit 12edf9ea02
1 changed files with 58 additions and 26 deletions
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84
gr-utils/loadpng.c
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@ -54,7 +54,7 @@ int loadpng(char *filename, unsigned char **image_ptr, int *xsize, int *ysize) {
png_structp png_ptr;
png_infop info_ptr;
png_bytep *row_pointers;
// png_byte color_type;
png_byte color_type;
// int number_of_passes;
unsigned char header[8];
@ -96,11 +96,16 @@ int loadpng(char *filename, unsigned char **image_ptr, int *xsize, int *ysize) {
*xsize=width/2;
*ysize=height;
// color_type = png_get_color_type(png_ptr, info_ptr);
color_type = png_get_color_type(png_ptr, info_ptr);
bit_depth = png_get_bit_depth(png_ptr, info_ptr);
if (debug) {
printf("PNG: width=%d height=%d depth=%d\n",width,height,bit_depth);
if (color_type==PNG_COLOR_TYPE_RGB) printf("Type RGB\n");
else if (color_type==PNG_COLOR_TYPE_RGB_ALPHA) printf("Type RGBA\n");
else if (color_type==PNG_COLOR_TYPE_PALETTE) printf("Type palette\n");
}
// number_of_passes = png_set_interlace_handling(png_ptr);
@ -122,33 +127,60 @@ int loadpng(char *filename, unsigned char **image_ptr, int *xsize, int *ysize) {
}
out_ptr=image;
for(y=0;y<height;y+=2) {
for(x=0;x<width/2;x++) {
if (color_type==PNG_COLOR_TYPE_RGB_ALPHA) {
for(y=0;y<height;y+=2) {
for(x=0;x<width/2;x++) {
/* top color */
color= (row_pointers[y][x*2*4]<<16)+
(row_pointers[y][x*2*4+1]<<8)+
(row_pointers[y][x*2*4+2]);
if (debug) {
printf("%x ",color);
/* top color */
color= (row_pointers[y][x*2*4]<<16)+
(row_pointers[y][x*2*4+1]<<8)+
(row_pointers[y][x*2*4+2]);
if (debug) {
printf("%x ",color);
}
a2_color=convert_color(color);
/* bottom color */
color= (row_pointers[y+1][x*2*4]<<16)+
(row_pointers[y+1][x*2*4+1]<<8)+
(row_pointers[y+1][x*2*4+2]);
if (debug) {
printf("%x ",color);
}
a2_color|=(convert_color(color)<<4);
*out_ptr=a2_color;
out_ptr++;
}
a2_color=convert_color(color);
/* bottom color */
color= (row_pointers[y+1][x*2*4]<<16)+
(row_pointers[y+1][x*2*4+1]<<8)+
(row_pointers[y+1][x*2*4+2]);
if (debug) {
printf("%x ",color);
}
a2_color|=(convert_color(color)<<4);
*out_ptr=a2_color;
out_ptr++;
if (debug) printf("\n");
}
if (debug) printf("\n");
}
else if (color_type==PNG_COLOR_TYPE_PALETTE) {
for(y=0;y<height;y+=2) {
for(x=0;x<width/2;x++) {
/* top color */
a2_color=row_pointers[y][x*2];
/* bottom color */
color=row_pointers[y+1][x*2];
a2_color|=(color<<4);
if (debug) {
printf("%x ",a2_color);
}
*out_ptr=a2_color;
out_ptr++;
}
if (debug) printf("\n");
}
}
else {
printf("Unknown color type\n");
}
/* Stripe test image */