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fix non-animated webp read

This commit is contained in:
John Cupitt 2018-11-26 17:14:57 +00:00
parent 1d64321649
commit 4e182440ef
1 changed files with 40 additions and 23 deletions
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63
libvips/foreign/webp2vips.c
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@ -44,8 +44,8 @@
/*
#define DEBUG_VERBOSE
*/
#define DEBUG
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
@ -134,10 +134,20 @@ typedef struct {
*/
VipsImage *frame;
/* The frame number currently in @frame. Numbered from 1, so 0 means
* before the first frame.
*/
int frame_no;
/* Iterate through the frames with this. iter.frame_num is the number
* of the current loaded frame.
* of the currently loaded frame.
*/
WebPIterator iter;
/* How to junk the current frame when we move on.
*/
WebPMuxAnimDispose dispose_method;
VipsRect dispose_rect;
} Read;
static void
@ -332,6 +342,8 @@ read_new( const char *filename, const void *data, size_t length,
read->fd = 0;
read->demux = NULL;
read->frame = NULL;
read->dispose_method = WEBP_MUX_DISPOSE_NONE;
read->frame_no = 0;
if( read->filename ) {
/* libwebp makes streaming from a file source very hard. We
@ -592,31 +604,22 @@ read_next_frame( Read *read )
{
VipsImage *frame;
/* Any dispose action.
/* Dispose from the previous frame.
*/
if( read->iter.dispose_method == WEBP_MUX_DISPOSE_BACKGROUND ) {
if( read->dispose_method == WEBP_MUX_DISPOSE_BACKGROUND )
/* We must clear the pixels occupied by this webp frame (not
* the whole of the read frame) to the background colour.
*/
VipsRect area = {
read->iter.x_offset,
read->iter.y_offset,
read->iter.width,
read->iter.height
};
vips_image_paint_pel( read->frame,
&area, (VipsPel *) &read->background );
}
&read->dispose_rect, (VipsPel *) &read->background );
/* Fetch the next frame.
/* Note this frame's dispose for next time.
*/
if( !WebPDemuxNextFrame( &read->iter ) ) {
vips_error( "webp2vips", "%s", _( "not enough frames" ) );
return( -1 );
}
read->dispose_method = read->iter.dispose_method;
read->dispose_rect.left = read->iter.x_offset;
read->dispose_rect.top = read->iter.y_offset;
read->dispose_rect.width = read->iter.width;
read->dispose_rect.height = read->iter.height;
#ifdef DEBUG
printf( "webp2vips: frame_num = %d\n", read->iter.frame_num );
@ -649,13 +652,22 @@ read_next_frame( Read *read )
/* Now blend or copy the new pixels into our accumulator.
*/
vips_image_paint_image( read->frame, frame,
read->iter.x_offset, read->iter.y_offset,
read->iter.blend_method == WEBP_MUX_BLEND );
g_object_unref( frame );
/* If there's another frame, move on.
*/
if( read->iter.frame_num < read->frame_count ) {
if( !WebPDemuxNextFrame( &read->iter ) ) {
vips_error( "webp2vips",
"%s", _( "not enough frames" ) );
return( -1 );
}
}
return( 0 );
}
@ -666,7 +678,9 @@ read_webp_generate( VipsRegion *or,
VipsRect *r = &or->valid;
Read *read = (Read *) a;
int frame = r->top / read->frame_height + read->page;
/* iter.frame_num numbers from 1.
*/
int frame = 1 + r->top / read->frame_height + read->page;
int line = r->top % read->frame_height;
#ifdef DEBUG_VERBOSE
@ -675,10 +689,13 @@ read_webp_generate( VipsRegion *or,
g_assert( r->height == 1 );
while( read->iter.frame_num < frame )
while( read->frame_no <= frame ) {
if( read_next_frame( read ) )
return( -1 );
read->frame_no += 1;
}
memcpy( VIPS_REGION_ADDR( or, 0, r->top ),
VIPS_IMAGE_ADDR( read->frame, 0, line ),
VIPS_IMAGE_SIZEOF_LINE( read->frame ) );