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wrlib: Improvement in the alpha channel support.

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There are some problems in the alpha channel support, as is
reported at http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=72917

This patch add a new RCombineAlpha function, based on Gimp. This
function is called when needed in the raster.c functions.

This patch is based on the Brad Jorsch <anomie@users.sourceforge.net>
patch for the 0.62.1-0.1 version.

[crmafra: v1 was sent by Rodolfo kix Garcia <kix@kix.es>]
This commit is contained in:
Christophe CURIS
2012-01-15 20:45:54 +01:00
committed by Carlos R. Mafra
parent e06b3005e8
commit 3ed409cbd0
5 changed files with 142 additions and 92 deletions
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3
wrlib/wraster.h
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@@ -356,6 +356,9 @@ void RCombineAreaWithOpaqueness(RImage *image, RImage *src, int sx, int sy,
unsigned width, unsigned height, int dx, int dy,
int opaqueness);
void RCombineAlpha(unsigned char *d, unsigned char *s, int s_has_alpha,
int width, int height, int dwi, int swi, int opacity);
RImage *RScaleImage(RImage *image, unsigned new_width, unsigned new_height);
RImage *RSmoothScaleImage(RImage *src, unsigned new_width,