c197362e9d
2007-11-05 Sven Neumann <sven@gimp.org> * app/widgets/gimpcairo-utils.h: introduced macros to set a single pixel in a Cairo surface without having to worry about endianness. * app/widgets/gimpcairo-utils.c * app/widgets/gimpviewrenderer.c * app/widgets/gimpviewrenderergradient.c * app/widgets/gimpviewrendererpalette.c: use the new macros. svn path=/trunk/; revision=24065
86 lines
2.9 KiB
C
86 lines
2.9 KiB
C
/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* gimpcairo-utils.h
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* Copyright (C) 2007 Sven Neumann <sven@gimp.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef __GIMP_CAIRO_UTILS_H__
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#define __GIMP_CAIRO_UTILS_H__
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void gimp_cairo_set_source_color (cairo_t *cr,
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GimpRGB *color);
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cairo_surface_t * gimp_cairo_create_surface_from_pixbuf (GdkPixbuf *pixbuf);
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#define INT_MULT(a,b,t) ((t) = (a) * (b) + 0x80, ((((t) >> 8) + (t)) >> 8))
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/* some useful macros for writing directly to a Cairo surface */
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/**
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* GIMP_CAIRO_RGB24_SET_PIXEL:
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* @d: pointer to the destination buffer
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* @r: red component
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* @g: green component
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* @b: blue component
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*
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* Sets a single pixel in an Cairo image surface in %CAIRO_FORMAT_RGB24.
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**/
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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#define GIMP_CAIRO_RGB24_SET_PIXEL(d, r, g, b) \
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G_STMT_START { d[0] = (b); d[1] = (g); d[2] = (r); } G_STMT_END
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#else
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#define GIMP_CAIRO_RGB24_SET_PIXEL(d, r, g, b) \
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G_STMT_START { d[1] = (r); d[2] = (g); d[3] = (b); } G_STMT_END
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#endif
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/**
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* GIMP_CAIRO_ARGB32_SET_PIXEL:
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* @d: pointer to the destination buffer
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* @r: red component, not pre-multiplied
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* @g: green component, not pre-multiplied
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* @b: blue component, not pre-multiplied
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* @a: alpha component
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*
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* Sets a single pixel in an Cairo image surface in %CAIRO_FORMAT_ARGB32.
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**/
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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#define GIMP_CAIRO_ARGB32_SET_PIXEL(d, r, g, b, a) \
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G_STMT_START { \
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guint t1, t2, t3; \
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d[0] = INT_MULT ((b), (a), t1); \
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d[1] = INT_MULT ((g), (a), t2); \
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d[2] = INT_MULT ((r), (a), t3); \
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d[3] = (a); \
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} G_STMT_END
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#else
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#define GIMP_CAIRO_ARGB32_SET_PIXEL(d, r, g, b, a) \
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G_STMT_START { \
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guint t1, t2, t3; \
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d[0] = (a); \
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d[1] = INT_MULT ((r), (a), t1); \
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d[2] = INT_MULT ((g), (a), t2); \
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d[3] = INT_MULT ((b), (a), t3); \
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} G_STMT_END
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#endif
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#endif /* __GIMP_CAIRO_UTILS_H__ */
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