mirror of
https://github.com/brl/mutter.git
synced 2024-12-26 21:02:14 +00:00
10a38bb14f
This adds a public function to read pixels from a framebuffer into a CoglBitmap. This replaces the internal function _cogl_read_pixels_with_rowstride because a CoglBitmap contains a rowstride so it can be used for the same purpose. A CoglBitmap already has public API to make one that points to a CoglPixelBuffer so this function can be used to read pixels into a PBO. It also avoids the need to push the framebuffer on to the context's stack so it provides a function which can be used in the 2.0 API after the stack is removed. Reviewed-by: Robert Bragg <robert@linux.intel.com>
110 lines
3.3 KiB
C
110 lines
3.3 KiB
C
/*
|
|
* Cogl
|
|
*
|
|
* An object oriented GL/GLES Abstraction/Utility Layer
|
|
*
|
|
* Copyright (C) 2010 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/>.
|
|
*
|
|
*
|
|
*/
|
|
|
|
#ifndef __COGL_PRIVATE_H__
|
|
#define __COGL_PRIVATE_H__
|
|
|
|
#include <cogl/cogl-pipeline.h>
|
|
|
|
#include "cogl-context.h"
|
|
|
|
G_BEGIN_DECLS
|
|
|
|
gboolean
|
|
_cogl_gl_update_features (CoglContext *context,
|
|
GError **error);
|
|
|
|
gboolean
|
|
_cogl_gles_update_features (CoglContext *context,
|
|
GError **error);
|
|
|
|
gboolean
|
|
_cogl_check_extension (const char *name, const char *ext);
|
|
|
|
void
|
|
_cogl_clear (const CoglColor *color, unsigned long buffers);
|
|
|
|
void
|
|
_cogl_init (void);
|
|
|
|
void
|
|
_cogl_push_source (CoglPipeline *pipeline, gboolean enable_legacy);
|
|
|
|
gboolean
|
|
_cogl_get_enable_legacy_state (void);
|
|
|
|
/*
|
|
* _cogl_pixel_format_get_bytes_per_pixel:
|
|
* @format: a #CoglPixelFormat
|
|
*
|
|
* Queries how many bytes a pixel of the given @format takes.
|
|
*
|
|
* Return value: The number of bytes taken for a pixel of the given
|
|
* @format.
|
|
*/
|
|
int
|
|
_cogl_pixel_format_get_bytes_per_pixel (CoglPixelFormat format);
|
|
|
|
/*
|
|
* _cogl_pixel_format_has_aligned_components:
|
|
* @format: a #CoglPixelFormat
|
|
*
|
|
* Queries whether the ordering of the components for the given
|
|
* @format depend on the endianness of the host CPU or if the
|
|
* components can be accessed using bit shifting and bitmasking by
|
|
* loading a whole pixel into a word.
|
|
*
|
|
* XXX: If we ever consider making something like this public we
|
|
* should really try to think of a better name and come up with
|
|
* much clearer documentation since it really depends on what
|
|
* point of view you consider this from whether a format like
|
|
* COGL_PIXEL_FORMAT_RGBA_8888 is endian dependent. E.g. If you
|
|
* read an RGBA_8888 pixel into a uint32
|
|
* it's endian dependent how you mask out the different channels.
|
|
* But If you already have separate color components and you want
|
|
* to write them to an RGBA_8888 pixel then the bytes can be
|
|
* written sequentially regardless of the endianness.
|
|
*
|
|
* Return value: %TRUE if you need to consider the host CPU
|
|
* endianness when dealing with the given @format
|
|
* else %FALSE.
|
|
*/
|
|
gboolean
|
|
_cogl_pixel_format_is_endian_dependant (CoglPixelFormat format);
|
|
|
|
/*
|
|
* COGL_PIXEL_FORMAT_CAN_HAVE_PREMULT(format):
|
|
* @format: a #CoglPixelFormat
|
|
*
|
|
* Returns TRUE if the pixel format can take a premult bit. This is
|
|
* currently true for all formats that have an alpha channel except
|
|
* COGL_PIXEL_FORMAT_A_8 (because that doesn't have any other
|
|
* components to multiply by the alpha).
|
|
*/
|
|
#define COGL_PIXEL_FORMAT_CAN_HAVE_PREMULT(format) \
|
|
(((format) & COGL_A_BIT) && (format) != COGL_PIXEL_FORMAT_A_8)
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __COGL_PRIVATE_H__ */
|