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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:30:19 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:30:19 +0000 |
commit | 5c1676dfe6d2f3c837a5e074117b45613fd29a72 (patch) | |
tree | cbffb45144febf451e54061db2b21395faf94bfe /libgimpcolor/gimpcairo.h | |
parent | Initial commit. (diff) | |
download | gimp-5c1676dfe6d2f3c837a5e074117b45613fd29a72.tar.xz gimp-5c1676dfe6d2f3c837a5e074117b45613fd29a72.zip |
Adding upstream version 2.10.34.upstream/2.10.34upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | libgimpcolor/gimpcairo.h | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/libgimpcolor/gimpcairo.h b/libgimpcolor/gimpcairo.h new file mode 100644 index 0000000..d96e963 --- /dev/null +++ b/libgimpcolor/gimpcairo.h @@ -0,0 +1,159 @@ +/* LIBGIMP - The GIMP Library + * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball + * + * gimpcairo.h + * Copyright (C) 2007 Sven Neumann <sven@gimp.org> + * 2010-2012 Michael Natterer <mitch@gimp.org> + * + * This library is free software: you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 3 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library. If not, see + * <https://www.gnu.org/licenses/>. + */ + +#ifndef __GIMP_CAIRO_H__ +#define __GIMP_CAIRO_H__ + + +void gimp_cairo_set_source_rgb (cairo_t *cr, + const GimpRGB *color); +void gimp_cairo_set_source_rgba (cairo_t *cr, + const GimpRGB *color); + +cairo_pattern_t * gimp_cairo_checkerboard_create (cairo_t *cr, + gint size, + const GimpRGB *light, + const GimpRGB *dark); + +const Babl * gimp_cairo_surface_get_format (cairo_surface_t *surface); +GeglBuffer * gimp_cairo_surface_create_buffer (cairo_surface_t *surface); + + +/* some useful macros for writing directly to a Cairo surface */ + +/** + * GIMP_CAIRO_RGB24_SET_PIXEL: + * @d: pointer to the destination buffer + * @r: red component + * @g: green component + * @b: blue component + * + * Sets a single pixel in an Cairo image surface in %CAIRO_FORMAT_RGB24. + * + * Since: 2.6 + **/ +#if G_BYTE_ORDER == G_LITTLE_ENDIAN +#define GIMP_CAIRO_RGB24_SET_PIXEL(d, r, g, b) \ + G_STMT_START { d[0] = (b); d[1] = (g); d[2] = (r); } G_STMT_END +#else +#define GIMP_CAIRO_RGB24_SET_PIXEL(d, r, g, b) \ + G_STMT_START { d[1] = (r); d[2] = (g); d[3] = (b); } G_STMT_END +#endif + + +/** + * GIMP_CAIRO_RGB24_GET_PIXEL: + * @s: pointer to the source buffer + * @r: red component + * @g: green component + * @b: blue component + * + * Gets a single pixel from a Cairo image surface in %CAIRO_FORMAT_RGB24. + * + * Since: 2.8 + **/ +#if G_BYTE_ORDER == G_LITTLE_ENDIAN +#define GIMP_CAIRO_RGB24_GET_PIXEL(s, r, g, b) \ + G_STMT_START { (b) = s[0]; (g) = s[1]; (r) = s[2]; } G_STMT_END +#else +#define GIMP_CAIRO_RGB24_GET_PIXEL(s, r, g, b) \ + G_STMT_START { (r) = s[1]; (g) = s[2]; (b) = s[3]; } G_STMT_END +#endif + + +/** + * GIMP_CAIRO_ARGB32_SET_PIXEL: + * @d: pointer to the destination buffer + * @r: red component, not pre-multiplied + * @g: green component, not pre-multiplied + * @b: blue component, not pre-multiplied + * @a: alpha component + * + * Sets a single pixel in an Cairo image surface in %CAIRO_FORMAT_ARGB32. + * + * Since: 2.6 + **/ +#if G_BYTE_ORDER == G_LITTLE_ENDIAN +#define GIMP_CAIRO_ARGB32_SET_PIXEL(d, r, g, b, a) \ + G_STMT_START { \ + const guint tr = (a) * (r) + 0x80; \ + const guint tg = (a) * (g) + 0x80; \ + const guint tb = (a) * (b) + 0x80; \ + (d)[0] = (((tb) >> 8) + (tb)) >> 8; \ + (d)[1] = (((tg) >> 8) + (tg)) >> 8; \ + (d)[2] = (((tr) >> 8) + (tr)) >> 8; \ + (d)[3] = (a); \ + } G_STMT_END +#else +#define GIMP_CAIRO_ARGB32_SET_PIXEL(d, r, g, b, a) \ + G_STMT_START { \ + const guint tr = (a) * (r) + 0x80; \ + const guint tg = (a) * (g) + 0x80; \ + const guint tb = (a) * (b) + 0x80; \ + (d)[0] = (a); \ + (d)[1] = (((tr) >> 8) + (tr)) >> 8; \ + (d)[2] = (((tg) >> 8) + (tg)) >> 8; \ + (d)[3] = (((tb) >> 8) + (tb)) >> 8; \ + } G_STMT_END +#endif + + +/** + * GIMP_CAIRO_ARGB32_GET_PIXEL: + * @s: pointer to the source buffer + * @r: red component, not pre-multiplied + * @g: green component, not pre-multiplied + * @b: blue component, not pre-multiplied + * @a: alpha component + * + * Gets a single pixel from a Cairo image surface in %CAIRO_FORMAT_ARGB32. + * + * Since: 2.8 + **/ +#if G_BYTE_ORDER == G_LITTLE_ENDIAN +#define GIMP_CAIRO_ARGB32_GET_PIXEL(s, r, g, b, a) \ + G_STMT_START { \ + const guint tb = (s)[0]; \ + const guint tg = (s)[1]; \ + const guint tr = (s)[2]; \ + const guint ta = (s)[3]; \ + (r) = (tr << 8) / (ta + 1); \ + (g) = (tg << 8) / (ta + 1); \ + (b) = (tb << 8) / (ta + 1); \ + (a) = ta; \ + } G_STMT_END +#else +#define GIMP_CAIRO_ARGB32_GET_PIXEL(s, r, g, b, a) \ + G_STMT_START { \ + const guint ta = (s)[0]; \ + const guint tr = (s)[1]; \ + const guint tg = (s)[2]; \ + const guint tb = (s)[3]; \ + (r) = (tr << 8) / (ta + 1); \ + (g) = (tg << 8) / (ta + 1); \ + (b) = (tb << 8) / (ta + 1); \ + (a) = ta; \ + } G_STMT_END +#endif + + +#endif /* __GIMP_CAIRO_H__ */ |