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deprecate webpload @shrink, use @scale instead 

We need a fractional scale for thumbnail on webp to work well. @shrink
still works, but @scale overrides it.
This commit is contained in:
John Cupitt 2019-04-30 18:29:16 +01:00
parent ec0b7e7bdf
commit 394f9baa5e
5 changed files with 70 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
ChangeLog
View File

@ -37,6 +37,7 @@
- dzsave to szi will write all associated images
- remove old c++ and python interfaces
- vipsthumbnail can thumbnail animated and multipage images
- deprecate webpload @shrink, use @scale instead
31/3/19 started 8.7.5
- better buffer sizing in tiff reader [omira-sch]

8
libvips/foreign/pforeign.h
View File

@ -226,14 +226,14 @@ int vips__iswebp_buffer( const void *buf, size_t len );
int vips__iswebp( const char *filename );
int vips__webp_read_file_header( const char *name, VipsImage *out,
int page, int n, int shrink );
int page, int n, double scale );
int vips__webp_read_file( const char *name, VipsImage *out,
int page, int n, int shrink );
int page, int n, double scale );
int vips__webp_read_buffer_header( const void *buf, size_t len, VipsImage *out,
int page, int n, int shrink );
int page, int n, double scale );
int vips__webp_read_buffer( const void *buf, size_t len, VipsImage *out,
int page, int n, int shrink );
int page, int n, double scale );
int vips__webp_write_file( VipsImage *out, const char *filename,
int Q, gboolean lossless, VipsForeignWebpPreset preset,

43
libvips/foreign/webp2vips.c
View File

@ -17,6 +17,9 @@
* - could memleak on some read errors
* 24/4/19
* - fix bg handling in animations
* 30/4/19
* - deprecate shrink, use scale instead, and make it a double ... this
* lets us do faster and more accurate thumbnailing
*/
/*
@ -90,9 +93,9 @@ typedef struct {
*/
int n;
/* Shrink-on-load factor. Use this to set scaled_width.
/* Scale-on-load factor. Use this to set scaled_width.
*/
int shrink;
double scale;
/* Size of final output image.
*/
@ -325,7 +328,7 @@ read_free( Read *read )
static Read *
read_new( const char *filename, const void *data, size_t length,
int page, int n, int shrink )
int page, int n, double scale )
{
Read *read;
@ -337,7 +340,7 @@ read_new( const char *filename, const void *data, size_t length,
read->length = length;
read->page = page;
read->n = n;
read->shrink = shrink;
read->scale = scale;
read->delay = 100;
read->fd = 0;
read->demux = NULL;
@ -394,10 +397,12 @@ read_header( Read *read, VipsImage *out )
canvas_width = WebPDemuxGetI( read->demux, WEBP_FF_CANVAS_WIDTH );
canvas_height = WebPDemuxGetI( read->demux, WEBP_FF_CANVAS_HEIGHT );
read->frame_width = canvas_width / read->shrink;
read->frame_height = canvas_height / read->shrink;
/* We round-to-nearest cf. pdfload etc.
*/
read->frame_width = VIPS_RINT( canvas_width * read->scale );
read->frame_height = VIPS_RINT( canvas_height * read->scale );
if( read->shrink > 1 ) {
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;
@ -521,11 +526,11 @@ read_header( Read *read, VipsImage *out )
int
vips__webp_read_file_header( const char *filename, VipsImage *out,
int page, int n, int shrink )
int page, int n, double scale )
{
Read *read;
if( !(read = read_new( filename, NULL, 0, page, n, shrink )) ) {
if( !(read = read_new( filename, NULL, 0, page, n, scale )) ) {
vips_error( "webp2vips",
_( "unable to open \"%s\"" ), filename );
return( -1 );
@ -606,10 +611,10 @@ 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->dispose_rect.top = read->iter.y_offset;
read->dispose_rect.width = read->iter.width;
read->dispose_rect.height = read->iter.height;
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;
#ifdef DEBUG
printf( "webp2vips: frame_num = %d\n", read->iter.frame_num );
@ -715,11 +720,11 @@ read_image( Read *read, VipsImage *out )
int
vips__webp_read_file( const char *filename, VipsImage *out,
int page, int n, int shrink )
int page, int n, double scale )
{
Read *read;
if( !(read = read_new( filename, NULL, 0, page, n, shrink )) ) {
if( !(read = read_new( filename, NULL, 0, page, n, scale )) ) {
vips_error( "webp2vips",
_( "unable to open \"%s\"" ), filename );
return( -1 );
@ -737,11 +742,11 @@ vips__webp_read_file( const char *filename, VipsImage *out,
int
vips__webp_read_buffer_header( const void *buf, size_t len, VipsImage *out,
int page, int n, int shrink )
int page, int n, double scale )
{
Read *read;
if( !(read = read_new( NULL, buf, len, page, n, shrink )) ) {
if( !(read = read_new( NULL, buf, len, page, n, scale )) ) {
vips_error( "webp2vips",
"%s", _( "unable to open buffer" ) );
return( -1 );
@ -759,11 +764,11 @@ vips__webp_read_buffer_header( const void *buf, size_t len, VipsImage *out,
int
vips__webp_read_buffer( const void *buf, size_t len, VipsImage *out,
int page, int n, int shrink )
int page, int n, double scale )
{
Read *read;
if( !(read = read_new( NULL, buf, len, page, n, shrink )) ) {
if( !(read = read_new( NULL, buf, len, page, n, scale )) ) {
vips_error( "webp2vips",
"%s", _( "unable to open buffer" ) );
return( -1 );

47
libvips/foreign/webpload.c
View File

@ -6,6 +6,8 @@
* - add @shrink
* 1/11/18
* - add @page, @n
* 30/4/19
* - deprecate @shrink, use @scale instead
*/
/*
@ -64,9 +66,13 @@ typedef struct _VipsForeignLoadWebp {
*/
int n;
/* Shrink by this much during load.
/* Scale by this much during load.
*/
int shrink;
double scale;
/* Old and deprecated scaling path.
*/
int shrink;
} VipsForeignLoadWebp;
typedef VipsForeignLoadClass VipsForeignLoadWebpClass;
@ -120,10 +126,20 @@ vips_foreign_load_webp_class_init( VipsForeignLoadWebpClass *class )
G_STRUCT_OFFSET( VipsForeignLoadWebp, n ),
-1, 100000, 1 );
VIPS_ARG_INT( class, "shrink", 22,
VIPS_ARG_DOUBLE( class, "scale", 22,
_( "Scale" ),
_( "Scale factor on load" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignLoadWebp, scale ),
0.0, 1024.0, 1.0 );
/* Old and deprecated scaling API. A float param lets do
* shrink-on-load for thumbnail faster and more accurately.
*/
VIPS_ARG_INT( class, "shrink", 23,
_( "Shrink" ),
_( "Shrink factor on load" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
VIPS_ARGUMENT_OPTIONAL_INPUT | VIPS_ARGUMENT_DEPRECATED,
G_STRUCT_OFFSET( VipsForeignLoadWebp, shrink ),
1, 1024, 1 );
@ -134,6 +150,7 @@ vips_foreign_load_webp_init( VipsForeignLoadWebp *webp )
{
webp->n = 1;
webp->shrink = 1;
webp->scale = 1.0;
}
typedef struct _VipsForeignLoadWebpFile {
@ -168,8 +185,15 @@ vips_foreign_load_webp_file_header( VipsForeignLoad *load )
VipsForeignLoadWebp *webp = (VipsForeignLoadWebp *) load;
VipsForeignLoadWebpFile *file = (VipsForeignLoadWebpFile *) load;
/* BC for the old API.
*/
if( !vips_object_argument_isset( VIPS_OBJECT( load ), "scale" ) &&
vips_object_argument_isset( VIPS_OBJECT( load ), "shrink" ) &&
webp->shrink != 0 )
webp->scale = 1.0 / webp->shrink;
if( vips__webp_read_file_header( file->filename, load->out,
webp->page, webp->n, webp->shrink ) )
webp->page, webp->n, webp->scale ) )
return( -1 );
VIPS_SETSTR( load->out->filename, file->filename );
@ -184,7 +208,7 @@ vips_foreign_load_webp_file_load( VipsForeignLoad *load )
VipsForeignLoadWebpFile *file = (VipsForeignLoadWebpFile *) load;
if( vips__webp_read_file( file->filename, load->real,
webp->page, webp->n, webp->shrink ) )
webp->page, webp->n, webp->scale ) )
return( -1 );
return( 0 );
@ -249,7 +273,7 @@ vips_foreign_load_webp_buffer_header( VipsForeignLoad *load )
if( vips__webp_read_buffer_header( buffer->buf->data,
buffer->buf->length, load->out,
webp->page, webp->n, webp->shrink ) )
webp->page, webp->n, webp->scale ) )
return( -1 );
return( 0 );
@ -263,7 +287,7 @@ vips_foreign_load_webp_buffer_load( VipsForeignLoad *load )
if( vips__webp_read_buffer( buffer->buf->data, buffer->buf->length,
load->real,
webp->page, webp->n, webp->shrink ) )
webp->page, webp->n, webp->scale ) )
return( -1 );
return( 0 );
@ -317,7 +341,7 @@ vips_foreign_load_webp_buffer_init( VipsForeignLoadWebpBuffer *buffer )
*
* * @page: %gint, page (frame) to read
* * @n: %gint, load this many pages
* * @shrink: %gint, shrink by this much on load
* * @scale: %gdouble, scale by this much on load
*
* Read a WebP file into a VIPS image.
*
@ -328,7 +352,8 @@ vips_foreign_load_webp_buffer_init( VipsForeignLoadWebpBuffer *buffer )
* left. Set to -1 to mean "until the end of the document". Use vips_grid()
* to change page layout.
*
* Use @shrink to specify a shrink-on-load factor.
* Use @scale to specify a scale-on-load factor. For example, 2.0 to double
* the size on load.
*
* The loader supports ICC, EXIF and XMP metadata.
*
@ -360,7 +385,7 @@ vips_webpload( const char *filename, VipsImage **out, ... )
*
* * @page: %gint, page (frame) to read
* * @n: %gint, load this many pages
* * @shrink: %gint, shrink by this much on load
* * @scale: %gdouble, scale by this much on load
*
* Read a WebP-formatted memory block into a VIPS image. Exactly as
* vips_webpload(), but read from a memory buffer.

10
libvips/resample/thumbnail.c
View File

@ -510,12 +510,12 @@ vips_thumbnail_open( VipsThumbnail *thumbnail )
}
else if( vips_isprefix( "VipsForeignLoadWebp", thumbnail->loader ) ) {
factor = (int) VIPS_MAX( 1.0,
factor = 1.0 /
vips_thumbnail_calculate_common_shrink( thumbnail,
thumbnail->input_width,
thumbnail->page_height ) );
thumbnail->page_height );
g_info( "loading webp with factor %g pre-shrink", factor );
g_info( "loading webp with factor %g pre-scale", factor );
}
if( !(im = class->open( thumbnail, factor )) )
@ -940,7 +940,7 @@ vips_thumbnail_file_open( VipsThumbnail *thumbnail, double factor )
vips_isprefix( "VipsForeignLoadWebp", thumbnail->loader ) ) {
return( vips_image_new_from_file( file->filename,
"access", VIPS_ACCESS_SEQUENTIAL,
"shrink", (int) factor,
"scale", factor,
NULL ) );
}
else if( vips_isprefix( "VipsForeignLoadOpenslide",
@ -1134,7 +1134,7 @@ vips_thumbnail_buffer_open( VipsThumbnail *thumbnail, double factor )
buffer->buf->data, buffer->buf->length,
buffer->option_string,
"access", VIPS_ACCESS_SEQUENTIAL,
"shrink", (int) factor,
"scale", factor,
NULL ) );
}
else if( vips_isprefix( "VipsForeignLoadOpenslide",