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add some printf dbg

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to linnsgif, trying to find the GIF decode bug
This commit is contained in:
John Cupitt 2021-03-02 10:19:22 +00:00
parent 68332663fb
commit 2a087df8fc
1 changed files with 31 additions and 0 deletions
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31
libvips/foreign/libnsgif/libnsgif.c
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@ -571,6 +571,8 @@ static void gif__record_previous_frame(gif_animation *gif)
const uint32_t *frame_data;
uint32_t *prev_frame;
printf( "gif__record_previous_frame:\n" );
if (gif->decoded_frame == GIF_INVALID_FRAME ||
gif->decoded_frame == gif->prev_index) {
/* No frame to copy, or already have this frame recorded. */
@ -613,6 +615,8 @@ static gif_result gif__recover_previous_frame(const gif_animation *gif)
unsigned width = gif->width < gif->prev_width ? gif->width : gif->prev_width;
uint32_t *frame_data;
printf( "gif__recover_previous_frame:\n" );
if (prev_frame == NULL) {
return GIF_FRAME_DATA_ERROR;
}
@ -659,6 +663,31 @@ gif_internal_decode_frame(gif_animation *gif,
unsigned int x, y, decode_y, burst_bytes;
register unsigned char colour;
printf( "gif_internal_decode_frame: frame = %d, clear_image = %d\n",
frame, clear_image );
printf( "gif->frames[frame].disposal_method == " );
switch( gif->frames[frame].disposal_method ) {
case 0:
printf( "NONE\n" );
break;
case GIF_FRAME_COMBINE:
printf( "COMBINE\n" );
break;
case GIF_FRAME_CLEAR:
printf( "CLEAR\n" );
break;
case GIF_FRAME_RESTORE:
printf( "RESTORE\n" );
break;
case GIF_FRAME_QUIRKS_RESTORE:
printf( "QUIRKS_RESTORE\n" );
break;
}
/* Ensure this frame is supposed to be decoded */
if (gif->frames[frame].display == false) {
return GIF_OK;
@ -880,6 +909,7 @@ gif_internal_decode_frame(gif_animation *gif,
}
/* Decompress the data */
printf( "... decompressing frame data\n" );
for (y = 0; y < height; y++) {
if (interlace) {
decode_y = gif_interlaced_line(height, y) + offset_y;
@ -924,6 +954,7 @@ gif_internal_decode_frame(gif_animation *gif,
}
}
} else {
printf( "... clearing frame\n" );
/* Clear our frame */
if (gif->frames[frame].disposal_method == GIF_FRAME_CLEAR) {
for (y = 0; y < height; y++) {