mirror of https://github.com/GNOME/gimp.git
157 lines
5.4 KiB
C
157 lines
5.4 KiB
C
/* LIBGIMP - The GIMP Library
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* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
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*
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* gimpcairocolor.h
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* Copyright (C) 2007 Sven Neumann <sven@gimp.org>
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* 2010 Michael Natterer <mitch@gimp.org>
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*
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* This library is free software: you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#ifndef __GIMP_CAIRO_COLOR_H__
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#define __GIMP_CAIRO_COLOR_H__
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void gimp_cairo_set_source_rgb (cairo_t *cr,
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const GimpRGB *color);
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void gimp_cairo_set_source_rgba (cairo_t *cr,
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const GimpRGB *color);
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cairo_pattern_t * gimp_cairo_checkerboard_create (cairo_t *cr,
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gint size,
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const GimpRGB *light,
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const GimpRGB *dark);
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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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* Since: GIMP 2.6
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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_RGB24_GET_PIXEL:
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* @s: pointer to the source 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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* Gets a single pixel from a Cairo image surface in %CAIRO_FORMAT_RGB24.
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*
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* Since: GIMP 2.8
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**/
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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#define GIMP_CAIRO_RGB24_GET_PIXEL(s, r, g, b) \
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G_STMT_START { (b) = s[0]; (g) = s[1]; (r) = s[2]; } G_STMT_END
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#else
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#define GIMP_CAIRO_RGB24_GET_PIXEL(s, r, g, b) \
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G_STMT_START { (r) = s[1]; (g) = s[2]; (b) = s[3]; } 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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* Since: GIMP 2.6
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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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const guint tr = (a) * (r) + 0x80; \
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const guint tg = (a) * (g) + 0x80; \
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const guint tb = (a) * (b) + 0x80; \
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(d)[0] = (((tb) >> 8) + (tb)) >> 8; \
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(d)[1] = (((tg) >> 8) + (tg)) >> 8; \
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(d)[2] = (((tr) >> 8) + (tr)) >> 8; \
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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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const guint tr = (a) * (r) + 0x80; \
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const guint tg = (a) * (g) + 0x80; \
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const guint tb = (a) * (b) + 0x80; \
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(d)[0] = (a); \
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(d)[1] = (((tr) >> 8) + (tr)) >> 8; \
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(d)[2] = (((tg) >> 8) + (tg)) >> 8; \
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(d)[3] = (((tb) >> 8) + (tb)) >> 8; \
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} G_STMT_END
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#endif
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/**
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* GIMP_CAIRO_ARGB32_GET_PIXEL:
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* @s: pointer to the source 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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* Gets a single pixel from a Cairo image surface in %CAIRO_FORMAT_ARGB32.
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*
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* Since: GIMP 2.8
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**/
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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#define GIMP_CAIRO_ARGB32_GET_PIXEL(s, r, g, b, a) \
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G_STMT_START { \
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const guint tb = (s)[0]; \
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const guint tg = (s)[1]; \
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const guint tr = (s)[2]; \
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const guint ta = (s)[3]; \
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(r) = (tr << 8) / (ta + 1); \
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(g) = (tg << 8) / (ta + 1); \
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(b) = (tb << 8) / (ta + 1); \
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(a) = ta; \
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} G_STMT_END
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#else
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#define GIMP_CAIRO_ARGB32_GET_PIXEL(s, r, g, b, a) \
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G_STMT_START { \
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const guint ta = (s)[0]; \
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const guint tr = (s)[1]; \
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const guint tg = (s)[2]; \
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const guint tb = (s)[3]; \
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(r) = (tr << 8) / (ta + 1); \
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(g) = (tg << 8) / (ta + 1); \
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(b) = (tb << 8) / (ta + 1); \
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(a) = ta; \
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} G_STMT_END
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#endif
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#endif /* __GIMP_CAIRO_COLOR_H__ */
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