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more animated webp load fixes 

webpload scale on load works for animated images
This commit is contained in:
John Cupitt 2019-05-01 16:25:13 +01:00
parent 37865e34f8
commit b1c995b2d9
1 changed files with 81 additions and 32 deletions
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113
libvips/foreign/webp2vips.c
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@ -153,6 +153,39 @@ typedef struct {
VipsRect dispose_rect;
} Read;
const char *
vips__error_webp( VP8StatusCode code )
{
switch( code ) {
case VP8_STATUS_OK:
return( "VP8_STATUS_OK" );
case VP8_STATUS_OUT_OF_MEMORY:
return( "VP8_STATUS_OUT_OF_MEMORY" );
case VP8_STATUS_INVALID_PARAM:
return( "VP8_STATUS_INVALID_PARAM" );
case VP8_STATUS_BITSTREAM_ERROR:
return( "VP8_STATUS_BITSTREAM_ERROR" );
case VP8_STATUS_UNSUPPORTED_FEATURE:
return( "VP8_STATUS_UNSUPPORTED_FEATURE" );
case VP8_STATUS_SUSPENDED:
return( "VP8_STATUS_SUSPENDED" );
case VP8_STATUS_USER_ABORT:
return( "VP8_STATUS_USER_ABORT" );
case VP8_STATUS_NOT_ENOUGH_DATA:
return( "VP8_STATUS_NOT_ENOUGH_DATA" );
default:
return( "<unkown>" );
}
}
static void
vips_image_paint_area( VipsImage *image, const VipsRect *r, const VipsPel *ink )
{
@ -233,32 +266,34 @@ blend_pixel( guint32 A, guint32 B )
return( setRGBA( rR, gR, bR, aR ) );
}
/* Blend sub into frame at left, top.
*/
static void
vips_image_paint_image( VipsImage *image,
VipsImage *ink, int x, int y, gboolean blend )
vips_image_paint_image( VipsImage *frame,
VipsImage *sub, int left, int top, gboolean blend )
{
VipsRect valid = { 0, 0, image->Xsize, image->Ysize };
VipsRect sub = { x, y, ink->Xsize, ink->Ysize };
int ps = VIPS_IMAGE_SIZEOF_PEL( image );
VipsRect frame_rect = { 0, 0, frame->Xsize, frame->Ysize };
VipsRect sub_rect = { left, top, sub->Xsize, sub->Ysize };
int ps = VIPS_IMAGE_SIZEOF_PEL( frame );
VipsRect ovl;
g_assert( VIPS_IMAGE_SIZEOF_PEL( ink ) == ps );
g_assert( VIPS_IMAGE_SIZEOF_PEL( sub ) == ps );
/* Disable blend if we are not RGBA.
*/
if( image->Bands != 4 )
if( frame->Bands != 4 )
blend = FALSE;
vips_rect_intersectrect( &valid, &sub, &ovl );
vips_rect_intersectrect( &frame_rect, &sub_rect, &ovl );
if( !vips_rect_isempty( &ovl ) ) {
VipsPel *p, *q;
int i;
int x, y;
p = VIPS_IMAGE_ADDR( ink, ovl.left - x, ovl.top - y );
q = VIPS_IMAGE_ADDR( image, ovl.left, ovl.top );
p = VIPS_IMAGE_ADDR( sub, ovl.left - left, ovl.top - top );
q = VIPS_IMAGE_ADDR( frame, ovl.left, ovl.top );
for( i = 0; i < ovl.height; i++ ) {
for( y = 0; y < ovl.height; y++ ) {
if( blend ) {
guint32 *A = (guint32 *) p;
guint32 *B = (guint32 *) q;
@ -270,8 +305,8 @@ vips_image_paint_image( VipsImage *image,
memcpy( (char *) q, (char *) p,
ovl.width * ps );
p += VIPS_IMAGE_SIZEOF_LINE( ink );
q += VIPS_IMAGE_SIZEOF_LINE( image );
p += VIPS_IMAGE_SIZEOF_LINE( sub );
q += VIPS_IMAGE_SIZEOF_LINE( frame );
}
}
}
@ -402,11 +437,12 @@ read_header( Read *read, VipsImage *out )
read->frame_width = VIPS_RINT( canvas_width * read->scale );
read->frame_height = VIPS_RINT( canvas_height * read->scale );
if( read->scale != 1.0 ) {
read->config.options.use_scaling = 1;
read->config.options.scaled_width = read->frame_width;
read->config.options.scaled_height = read->frame_height;
}
#ifdef DEBUG
printf( "webp2vips: canvas_width = %d\n", canvas_width );
printf( "webp2vips: canvas_height = %d\n", canvas_height );
printf( "webp2vips: frame_width = %d\n", read->frame_width );
printf( "webp2vips: frame_height = %d\n", read->frame_height );
#endif /*DEBUG*/
flags = WebPDemuxGetI( read->demux, WEBP_FF_FORMAT_FLAGS );
@ -546,6 +582,9 @@ vips__webp_read_file_header( const char *filename, VipsImage *out,
return( 0 );
}
/* Read a single frame -- a width * height block of pixels. This will get
* blended into the accumulator at some offset.
*/
static VipsImage *
read_frame( Read *read,
int width, int height, const guint8 *data, size_t length )
@ -558,7 +597,7 @@ read_frame( Read *read,
frame = vips_image_new_memory();
vips_image_init_fields( frame,
width, height,
width, height,
read->alpha ? 4 : 3,
VIPS_FORMAT_UCHAR, VIPS_CODING_NONE,
VIPS_INTERPRETATION_sRGB,
@ -573,6 +612,11 @@ read_frame( Read *read,
read->config.output.u.RGBA.rgba = VIPS_IMAGE_ADDR( frame, 0, 0 );
read->config.output.u.RGBA.stride = VIPS_IMAGE_SIZEOF_LINE( frame );
read->config.output.u.RGBA.size = VIPS_IMAGE_SIZEOF_IMAGE( frame );
if( read->scale != 1.0 ) {
read->config.options.use_scaling = 1;
read->config.options.scaled_width = width;
read->config.options.scaled_height = height;
}
if( WebPDecode( data, length, &read->config ) != VP8_STATUS_OK ) {
g_object_unref( frame );
@ -587,16 +631,24 @@ static int
read_next_frame( Read *read )
{
VipsImage *frame;
VipsRect area;
#ifdef DEBUG
printf( "read_next_frame:\n" );
#endif /*DEBUG*/
/* Area of this frame, in output image coordinates.
*/
area.left = read->iter.x_offset * read->scale;
area.top = read->iter.y_offset * read->scale;
area.width = read->iter.width * read->scale;
area.height = read->iter.height * read->scale;
/* Dispose from the previous frame.
*/
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 0 (transparent).
/* We must clear the pixels occupied by the previous webp
* frame (not the whole of the read frame) to 0 (transparent).
*
* We do not clear to WEBP_FF_BACKGROUND_COLOR. That's only
* used to composite down to RGB. Perhaps we
@ -611,17 +663,14 @@ read_next_frame( Read *read )
/* Note this frame's dispose for next time.
*/
read->dispose_method = read->iter.dispose_method;
read->dispose_rect.left = read->iter.x_offset * read->scale;
read->dispose_rect.top = read->iter.y_offset * read->scale;
read->dispose_rect.width = read->iter.width * read->scale;
read->dispose_rect.height = read->iter.height * read->scale;
read->dispose_rect = area;
#ifdef DEBUG
printf( "webp2vips: frame_num = %d\n", read->iter.frame_num );
printf( " x_offset = %d\n", read->iter.x_offset );
printf( " y_offset = %d\n", read->iter.y_offset );
printf( " width = %d\n", read->iter.width );
printf( " height = %d\n", read->iter.height );
printf( " left = %d\n", area.left );
printf( " top = %d\n", area.top );
printf( " width = %d\n", area.width );
printf( " height = %d\n", area.height );
printf( " duration = %d\n", read->iter.duration );
printf( " dispose = " );
if( read->iter.dispose_method == WEBP_MUX_DISPOSE_BACKGROUND )
@ -642,14 +691,14 @@ read_next_frame( Read *read )
"not all frames have equal duration" );
if( !(frame = read_frame( read,
read->iter.width, read->iter.height,
area.width, area.height,
read->iter.fragment.bytes, read->iter.fragment.size )) )
return( -1 );
/* 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,
area.left, area.top,
read->iter.blend_method == WEBP_MUX_BLEND );
g_object_unref( frame );