mutter/cogl/cogl-color.c
Robert Bragg b72f255c0a Start to reduce dependence on glib
Since we've had several developers from admirable projects say they
would like to use Cogl but would really prefer not to pull in
gobject,gmodule and glib as extra dependencies we are investigating if
we can get to the point where glib is only an optional dependency.
Actually we feel like we only make minimal use of glib anyway, so it may
well be quite straightforward to achieve this.

This adds a --disable-glib configure option that can be used to disable
features that depend on glib.

Actually --disable-glib doesn't strictly disable glib at this point
because it's more helpful if cogl continues to build as we make
incremental progress towards this.

The first use of glib that this patch tackles is the use of
g_return_val_if_fail and g_return_if_fail which have been replaced with
equivalent _COGL_RETURN_VAL_IF_FAIL and _COGL_RETURN_IF_FAIL macros.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
2011-11-01 12:03:02 +00:00

315 lines
6.4 KiB
C

/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2008,2009 Intel Corporation.
*
* 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 2 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 <http://www.gnu.org/licenses/>.
*
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "cogl.h"
#include "cogl-util.h"
#include "cogl-color.h"
#include "cogl-fixed.h"
CoglColor *
cogl_color_new (void)
{
return g_slice_new (CoglColor);
}
CoglColor *
cogl_color_copy (const CoglColor *color)
{
if (G_LIKELY (color))
return g_slice_dup (CoglColor, color);
return NULL;
}
void
cogl_color_free (CoglColor *color)
{
if (G_LIKELY (color))
g_slice_free (CoglColor, color);
}
void
cogl_color_init_from_4ub (CoglColor *color,
guint8 red,
guint8 green,
guint8 blue,
guint8 alpha)
{
_COGL_RETURN_IF_FAIL (color != NULL);
color->red = red;
color->green = green;
color->blue = blue;
color->alpha = alpha;
}
/* XXX: deprecated, use cogl_color_init_from_4ub */
void
cogl_color_set_from_4ub (CoglColor *dest,
guint8 red,
guint8 green,
guint8 blue,
guint8 alpha)
{
cogl_color_init_from_4ub (dest, red, green, blue, alpha);
}
void
cogl_color_init_from_4f (CoglColor *color,
float red,
float green,
float blue,
float alpha)
{
_COGL_RETURN_IF_FAIL (color != NULL);
color->red = (red * 255);
color->green = (green * 255);
color->blue = (blue * 255);
color->alpha = (alpha * 255);
}
/* XXX: deprecated, use cogl_color_init_from_4f */
void
cogl_color_set_from_4f (CoglColor *color,
float red,
float green,
float blue,
float alpha)
{
cogl_color_init_from_4f (color, red, green, blue, alpha);
}
void
cogl_color_init_from_4fv (CoglColor *color,
float *color_array)
{
_COGL_RETURN_IF_FAIL (color != NULL);
color->red = (color_array[0] * 255);
color->green = (color_array[1] * 255);
color->blue = (color_array[2] * 255);
color->alpha = (color_array[3] * 255);
}
unsigned char
cogl_color_get_red_byte (const CoglColor *color)
{
return color->red;
}
float
cogl_color_get_red_float (const CoglColor *color)
{
return (float) color->red / 255.0;
}
float
cogl_color_get_red (const CoglColor *color)
{
return ((float) color->red / 255.0);
}
unsigned char
cogl_color_get_green_byte (const CoglColor *color)
{
return color->green;
}
float
cogl_color_get_green_float (const CoglColor *color)
{
return (float) color->green / 255.0;
}
float
cogl_color_get_green (const CoglColor *color)
{
return ((float) color->green / 255.0);
}
unsigned char
cogl_color_get_blue_byte (const CoglColor *color)
{
return color->blue;
}
float
cogl_color_get_blue_float (const CoglColor *color)
{
return (float) color->blue / 255.0;
}
float
cogl_color_get_blue (const CoglColor *color)
{
return ((float) color->blue / 255.0);
}
unsigned char
cogl_color_get_alpha_byte (const CoglColor *color)
{
return color->alpha;
}
float
cogl_color_get_alpha_float (const CoglColor *color)
{
return (float) color->alpha / 255.0;
}
float
cogl_color_get_alpha (const CoglColor *color)
{
return ((float) color->alpha / 255.0);
}
void
cogl_color_set_red_byte (CoglColor *color,
unsigned char red)
{
color->red = red;
}
void
cogl_color_set_red_float (CoglColor *color,
float red)
{
color->red = red * 255.0;
}
void
cogl_color_set_red (CoglColor *color,
float red)
{
color->red = red * 255.0;
}
void
cogl_color_set_green_byte (CoglColor *color,
unsigned char green)
{
color->green = green;
}
void
cogl_color_set_green_float (CoglColor *color,
float green)
{
color->green = green * 255.0;
}
void
cogl_color_set_green (CoglColor *color,
float green)
{
color->green = green * 255.0;
}
void
cogl_color_set_blue_byte (CoglColor *color,
unsigned char blue)
{
color->blue = blue;
}
void
cogl_color_set_blue_float (CoglColor *color,
float blue)
{
color->blue = blue * 255.0;
}
void
cogl_color_set_blue (CoglColor *color,
float blue)
{
color->blue = blue * 255.0;
}
void
cogl_color_set_alpha_byte (CoglColor *color,
unsigned char alpha)
{
color->alpha = alpha;
}
void
cogl_color_set_alpha_float (CoglColor *color,
float alpha)
{
color->alpha = alpha * 255.0;
}
void
cogl_color_set_alpha (CoglColor *color,
float alpha)
{
color->alpha = alpha * 255.0;
}
void
cogl_color_premultiply (CoglColor *color)
{
color->red = (color->red * color->alpha + 128) / 255;
color->green = (color->green * color->alpha + 128) / 255;
color->blue = (color->blue * color->alpha + 128) / 255;
}
void
cogl_color_unpremultiply (CoglColor *color)
{
if (color->alpha != 0)
{
color->red = (color->red * 255) / color->alpha;
color->green = (color->green * 255) / color->alpha;
color->blue = (color->blue * 255) / color->alpha;
}
}
gboolean
cogl_color_equal (gconstpointer v1, gconstpointer v2)
{
const guint32 *c1 = v1, *c2 = v2;
_COGL_RETURN_VAL_IF_FAIL (v1 != NULL, FALSE);
_COGL_RETURN_VAL_IF_FAIL (v2 != NULL, FALSE);
/* XXX: We don't compare the padding */
return *c1 == *c2 ? TRUE : FALSE;
}
void
_cogl_color_get_rgba_4ubv (const CoglColor *color,
guint8 *dest)
{
memcpy (dest, color, 4);
}