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make pngload from buffer set flags 

and remove some dead code from jpegload
This commit is contained in:
John Cupitt 2017-01-27 11:15:48 +00:00
parent 94434c2359
commit 756e69cf96
4 changed files with 45 additions and 15 deletions
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10
libvips/foreign/jpegload.c
View File

@ -169,14 +169,6 @@ typedef VipsForeignLoadJpegClass VipsForeignLoadJpegFileClass;
G_DEFINE_TYPE( VipsForeignLoadJpegFile, vips_foreign_load_jpeg_file,
vips_foreign_load_jpeg_get_type() );
static VipsForeignFlags
vips_foreign_load_jpeg_file_get_flags_filename( const char *filename )
{
/* The jpeg reader supports sequential read.
*/
return( VIPS_FOREIGN_SEQUENTIAL );
}
static gboolean
vips_foreign_load_jpeg_file_is_a( const char *filename )
{
@ -232,8 +224,6 @@ vips_foreign_load_jpeg_file_class_init( VipsForeignLoadJpegFileClass *class )
*/
foreign_class->priority = 50;
load_class->get_flags_filename =
vips_foreign_load_jpeg_file_get_flags_filename;
load_class->is_a = vips_foreign_load_jpeg_file_is_a;
load_class->header = vips_foreign_load_jpeg_file_header;
load_class->load = vips_foreign_load_jpeg_file_load;

1
libvips/foreign/pforeign.h
View File

@ -183,6 +183,7 @@ int vips__png_read( const char *name, VipsImage *out, gboolean readbehind );
gboolean vips__png_ispng_buffer( const void *buf, size_t len );
int vips__png_ispng( const char *filename );
gboolean vips__png_isinterlaced( const char *filename );
gboolean vips__png_isinterlaced_buffer( const void *buffer, size_t length );
extern const char *vips__png_suffs[];
int vips__png_read_buffer( const void *buffer, size_t length,
VipsImage *out, gboolean readbehind );

27
libvips/foreign/pngload.c
View File

@ -167,12 +167,29 @@ typedef VipsForeignLoadClass VipsForeignLoadPngBufferClass;
G_DEFINE_TYPE( VipsForeignLoadPngBuffer, vips_foreign_load_png_buffer,
VIPS_TYPE_FOREIGN_LOAD );
static VipsForeignFlags
vips_foreign_load_png_buffer_get_flags( VipsForeignLoad *load )
{
VipsForeignLoadPngBuffer *buffer = (VipsForeignLoadPngBuffer *) load;
VipsForeignFlags flags;
flags = 0;
if( vips__png_isinterlaced_buffer( buffer->buf->data,
buffer->buf->length ) )
flags |= VIPS_FOREIGN_PARTIAL;
else
flags |= VIPS_FOREIGN_SEQUENTIAL;
return( flags );
}
static int
vips_foreign_load_png_buffer_header( VipsForeignLoad *load )
{
VipsForeignLoadPngBuffer *png = (VipsForeignLoadPngBuffer *) load;
VipsForeignLoadPngBuffer *buffer = (VipsForeignLoadPngBuffer *) load;
if( vips__png_header_buffer( png->buf->data, png->buf->length,
if( vips__png_header_buffer( buffer->buf->data, buffer->buf->length,
load->out ) )
return( -1 );
@ -182,9 +199,9 @@ vips_foreign_load_png_buffer_header( VipsForeignLoad *load )
static int
vips_foreign_load_png_buffer_load( VipsForeignLoad *load )
{
VipsForeignLoadPngBuffer *png = (VipsForeignLoadPngBuffer *) load;
VipsForeignLoadPngBuffer *buffer = (VipsForeignLoadPngBuffer *) load;
if( vips__png_read_buffer( png->buf->data, png->buf->length,
if( vips__png_read_buffer( buffer->buf->data, buffer->buf->length,
load->real, load->access == VIPS_ACCESS_SEQUENTIAL ) )
return( -1 );
@ -218,7 +235,7 @@ vips_foreign_load_png_buffer_class_init( VipsForeignLoadPngBufferClass *class )
}
static void
vips_foreign_load_png_buffer_init( VipsForeignLoadPngBuffer *png )
vips_foreign_load_png_buffer_init( VipsForeignLoadPngBuffer *buffer )
{
}

22
libvips/foreign/vipspng.c
View File

@ -710,6 +710,28 @@ vips__png_read_buffer( const void *buffer, size_t length, VipsImage *out,
return( 0 );
}
/* Interlaced PNGs need to be entirely decompressed into memory then can be
* served partially from there. Non-interlaced PNGs may be read sequentially.
*/
gboolean
vips__png_isinterlaced_buffer( const void *buffer, size_t length )
{
VipsImage *image;
Read *read;
int interlace_type;
image = vips_image_new();
if( !(read = read_new_buffer( image, buffer, length, FALSE )) ) {
g_object_unref( image );
return( -1 );
}
interlace_type = png_get_interlace_type( read->pPng, read->pInfo );
g_object_unref( image );
return( interlace_type != PNG_INTERLACE_NONE );
}
const char *vips__png_suffs[] = { ".png", NULL };
/* What we track during a PNG write.