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better gif load via magick7

This commit is contained in:
John Cupitt 2016-07-29 12:35:55 +01:00
parent 6d217f6f68
commit 422b029602
2 changed files with 35 additions and 60 deletions
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15
TODO
View File

@ -1,17 +1,6 @@
- try:
- try a gif with transparency
vips magickload images/cramps.gif x.png
we get a four-band png with a strange alpha ... should be 0/255, but it has
greyscale values in
try with convert, get a one-band png, no alpha at all
solution: cramps.gif is tagged as ImageType 4, palette image (not palette
alpha) ... the four channels are RGB + index, index is 0 - 15, the index
values for the gif
we'll need a separate path for each imagetype :-(
- try loading a PNG
- try loading a DICOM

72
libvips/foreign/magick7load.c
View File

@ -316,8 +316,21 @@ vips_foreign_load_magick7_parse( VipsForeignLoadMagick7 *magick7,
*/
out->Xsize = image->columns;
out->Ysize = image->rows;
out->Bands = GetPixelChannels( image );
magick7->frame_height = image->rows;
out->Bands = GetPixelChannels( image );
switch( GetImageType( image ) ) {
case PaletteType:
case PaletteAlphaType:
case PaletteBilevelAlphaType:
/* Palette images include an index channel, which we drop.
*/
out->Bands -= 1;
break;
default:
break;
};
/* Depth can be 'fractional'. You'd think we should use
* GetImageDepth() but that seems to compute something very complex.
@ -451,28 +464,27 @@ vips_foreign_load_magick7_parse( VipsForeignLoadMagick7 *magick7,
return( 0 );
}
#define UNPACK( TYPE, Q, P ) { \
TYPE * restrict tq = (TYPE *) (Q); \
/* We don't bother with GetPixelReadMask((), assume it's everywhere. Don't
* bother with traits, assume taht's always update.
*
* We do skip index channels. Palette images add extra index channels
* containing the index value from the file before colourmap lookup.
*/
#define UNPACK( TYPE ) { \
TYPE * restrict tq = (TYPE *) q; \
int x; \
int b; \
\
for( x = 0; x < r->width; x++ ) { \
if( GetPixelReadMask( image, (P) ) ) { \
for( b = 0; b < GetPixelChannels( image ); b++ ) { \
PixelChannel channel = \
GetPixelChannelChannel( image, b ); \
PixelTrait traits = \
GetPixelChannelTraits( image, channel );\
\
if( (traits & UpdatePixelTrait) == 0 ) \
continue; \
\
tq[b] = (P)[b]; \
} \
if( channel != IndexPixelChannel ) \
*tq++ = p[b]; \
} \
\
(P) += GetPixelChannels( image ); \
tq += GetPixelChannels( image ); \
p += GetPixelChannels( image ); \
} \
}
@ -509,45 +521,19 @@ vips_foreign_load_magick7_fill_region( VipsRegion *or,
switch( im->BandFmt ) {
case VIPS_FORMAT_UCHAR:
{
unsigned char * restrict tq = (unsigned char *) q;
int x;
int b;
for( x = 0; x < r->width; x++ ) {
if( GetPixelReadMask( image, p ) ) {
for( b = 0; b < GetPixelChannels( image ); b++ ) {
PixelChannel channel =
GetPixelChannelChannel( image, b );
PixelTrait traits =
GetPixelChannelTraits( image, channel );
if( (traits & UpdatePixelTrait ) == 0 )
continue;
tq[b] = p[b];
}
}
p += GetPixelChannels( image );
tq += GetPixelChannels( image );
}
}
//UNPACK( unsigned char, q, p );
UNPACK( unsigned char );
break;
case VIPS_FORMAT_USHORT:
UNPACK( unsigned short, q, p );
UNPACK( unsigned short );
break;
case VIPS_FORMAT_FLOAT:
UNPACK( float, q, p );
UNPACK( float );
break;
case VIPS_FORMAT_DOUBLE:
UNPACK( double, q, p );
UNPACK( double );
break;
default: