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0bce7eac53
As part of an incremental process to have Cogl be a standalone project we
want to re-consider how we organise the Cogl source code.
Currently this is the structure I'm aiming for:
cogl/
cogl/
<put common source here>
winsys/
cogl-glx.c
cogl-wgl.c
driver/
gl/
gles/
os/ ?
utils/
cogl-fixed
cogl-matrix-stack?
cogl-journal?
cogl-primitives?
pango/
The new winsys component is a starting point for migrating window system
code (i.e. x11,glx,wgl,osx,egl etc) from Clutter to Cogl.
The utils/ and pango/ directories aren't added by this commit, but they are
noted because I plan to add them soon.
Overview of the planned structure:
* The winsys/ API is the API that binds OpenGL to a specific window system,
be that X11 or win32 etc. Example are glx, wgl and egl. Much of the logic
under clutter/{glx,osx,win32 etc} should migrate here.
* Note there is also the idea of a winsys-base that may represent a window
system for which there are multiple winsys APIs. An example of this is
x11, since glx and egl may both be used with x11. (currently only Clutter
has the idea of a winsys-base)
* The driver/ represents a specific varient of OpenGL. Currently we have "gl"
representing OpenGL 1.4-2.1 (mostly fixed function) and "gles" representing
GLES 1.1 (fixed funciton) and 2.0 (fully shader based)
* Everything under cogl/ should fundamentally be supporting access to the
GPU. Essentially Cogl's most basic requirement is to provide a nice GPU
Graphics API and drawing a line between this and the utility functionality
we add to support Clutter should help keep this lean and maintainable.
* Code under utils/ as suggested builds on cogl/ adding more convenient
APIs or mechanism to optimize special cases. Broadly speaking you can
compare cogl/ to OpenGL and utils/ to GLU.
* clutter/pango will be moved to clutter/cogl/pango
How some of the internal configure.ac/pkg-config terminology has changed:
backendextra -> CLUTTER_WINSYS_BASE # e.g. "x11"
backendextralib -> CLUTTER_WINSYS_BASE_LIB # e.g. "x11/libclutter-x11.la"
clutterbackend -> {CLUTTER,COGL}_WINSYS # e.g. "glx"
CLUTTER_FLAVOUR -> {CLUTTER,COGL}_WINSYS
clutterbackendlib -> CLUTTER_WINSYS_LIB
CLUTTER_COGL -> COGL_DRIVER # e.g. "gl"
Note: The CLUTTER_FLAVOUR and CLUTTER_COGL defines are kept for apps
As the first thing to take advantage of the new winsys component in Cogl;
cogl_get_proc_address() has been moved from cogl/{gl,gles}/cogl.c into
cogl/common/cogl.c and this common implementation first trys
_cogl_winsys_get_proc_address() but if that fails then it falls back to
gmodule.
461 lines
11 KiB
C
461 lines
11 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2007,2008,2009 Intel Corporation.
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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 2 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, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "cogl.h"
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#include "cogl-internal.h"
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#include "cogl-bitmap-private.h"
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#include <string.h>
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/* TO rgba */
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inline static void
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_cogl_g_to_rgba (const guchar *src, guchar *dst)
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{
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dst[0] = src[0];
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dst[1] = src[0];
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dst[2] = src[0];
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dst[3] = 255;
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}
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inline static void
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_cogl_rgb_to_rgba (const guchar *src, guchar *dst)
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{
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dst[0] = src[0];
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dst[1] = src[1];
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dst[2] = src[2];
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dst[3] = 255;
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}
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inline static void
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_cogl_bgr_to_rgba (const guchar *src, guchar *dst)
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{
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dst[0] = src[2];
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dst[1] = src[1];
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dst[2] = src[0];
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dst[3] = 255;
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}
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inline static void
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_cogl_bgra_to_rgba (const guchar *src, guchar *dst)
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{
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dst[0] = src[2];
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dst[1] = src[1];
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dst[2] = src[0];
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dst[3] = src[3];
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}
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inline static void
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_cogl_argb_to_rgba (const guchar *src, guchar *dst)
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{
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dst[0] = src[1];
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dst[1] = src[2];
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dst[2] = src[3];
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dst[3] = src[0];
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}
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inline static void
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_cogl_abgr_to_rgba (const guchar *src, guchar *dst)
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{
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dst[0] = src[3];
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dst[1] = src[2];
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dst[2] = src[1];
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dst[3] = src[0];
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}
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inline static void
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_cogl_rgba_to_rgba (const guchar *src, guchar *dst)
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{
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dst[0] = src[0];
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dst[1] = src[1];
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dst[2] = src[2];
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dst[3] = src[3];
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}
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/* FROM rgba */
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inline static void
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_cogl_rgba_to_g (const guchar *src, guchar *dst)
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{
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dst[0] = (src[0] + src[1] + src[2]) / 3;
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}
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inline static void
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_cogl_rgba_to_rgb (const guchar *src, guchar *dst)
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{
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dst[0] = src[0];
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dst[1] = src[1];
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dst[2] = src[2];
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}
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inline static void
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_cogl_rgba_to_bgr (const guchar *src, guchar *dst)
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{
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dst[0] = src[2];
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dst[1] = src[1];
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dst[2] = src[0];
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}
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inline static void
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_cogl_rgba_to_bgra (const guchar *src, guchar *dst)
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{
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dst[0] = src[2];
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dst[1] = src[1];
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dst[2] = src[0];
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dst[3] = src[3];
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}
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inline static void
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_cogl_rgba_to_argb (const guchar *src, guchar *dst)
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{
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dst[0] = src[3];
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dst[1] = src[0];
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dst[2] = src[1];
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dst[3] = src[2];
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}
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inline static void
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_cogl_rgba_to_abgr (const guchar *src, guchar *dst)
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{
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dst[0] = src[3];
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dst[1] = src[2];
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dst[2] = src[1];
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dst[3] = src[0];
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}
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/* (Un)Premultiplication */
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inline static void
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_cogl_unpremult_alpha_0 (const guchar *src, guchar *dst)
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{
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dst[0] = 0;
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dst[1] = 0;
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dst[2] = 0;
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dst[3] = 0;
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}
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inline static void
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_cogl_unpremult_alpha_last (const guchar *src, guchar *dst)
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{
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guchar alpha = src[3];
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dst[0] = (src[0] * 255) / alpha;
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dst[1] = (src[1] * 255) / alpha;
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dst[2] = (src[2] * 255) / alpha;
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dst[3] = alpha;
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}
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inline static void
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_cogl_unpremult_alpha_first (const guchar *src, guchar *dst)
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{
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guchar alpha = src[0];
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dst[0] = alpha;
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dst[1] = (src[1] * 255) / alpha;
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dst[2] = (src[2] * 255) / alpha;
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dst[3] = (src[3] * 255) / alpha;
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}
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/* No division form of floor((c*a + 128)/255) (I first encountered
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* this in the RENDER implementation in the X server.) Being exact
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* is important for a == 255 - we want to get exactly c.
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*/
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#define MULT(d,c,a,t) G_STMT_START { t = c * a + 128; d = ((t >> 8) + t) >> 8; } G_STMT_END
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inline static void
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_cogl_premult_alpha_last (const guchar *src, guchar *dst)
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{
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guchar alpha = src[3];
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/* Using a separate temporary per component has given slightly better
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* code generation with GCC in the past; it shouldn't do any worse in
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* any case.
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*/
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guint t1, t2, t3;
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MULT(dst[0], src[0], alpha, t1);
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MULT(dst[1], src[1], alpha, t2);
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MULT(dst[2], src[2], alpha, t3);
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dst[3] = alpha;
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}
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inline static void
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_cogl_premult_alpha_first (const guchar *src, guchar *dst)
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{
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guchar alpha = src[0];
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guint t1, t2, t3;
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dst[0] = alpha;
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MULT(dst[1], src[1], alpha, t1);
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MULT(dst[2], src[2], alpha, t2);
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MULT(dst[3], src[3], alpha, t3);
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}
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#undef MULT
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gboolean
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_cogl_bitmap_fallback_can_convert (CoglPixelFormat src, CoglPixelFormat dst)
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{
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if (src == dst)
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return FALSE;
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switch (src & COGL_UNORDERED_MASK)
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{
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case COGL_PIXEL_FORMAT_G_8:
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case COGL_PIXEL_FORMAT_24:
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case COGL_PIXEL_FORMAT_32:
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if ((dst & COGL_UNORDERED_MASK) != COGL_PIXEL_FORMAT_24 &&
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(dst & COGL_UNORDERED_MASK) != COGL_PIXEL_FORMAT_32 &&
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(dst & COGL_UNORDERED_MASK) != COGL_PIXEL_FORMAT_G_8)
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return FALSE;
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break;
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default:
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return FALSE;
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}
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return TRUE;
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}
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gboolean
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_cogl_bitmap_fallback_can_unpremult (CoglPixelFormat format)
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{
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return ((format & COGL_UNORDERED_MASK) == COGL_PIXEL_FORMAT_32);
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}
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gboolean
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_cogl_bitmap_fallback_can_premult (CoglPixelFormat format)
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{
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return ((format & COGL_UNORDERED_MASK) == COGL_PIXEL_FORMAT_32);
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}
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gboolean
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_cogl_bitmap_fallback_convert (const CoglBitmap *bmp,
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CoglBitmap *dst_bmp,
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CoglPixelFormat dst_format)
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{
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guchar *src;
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guchar *dst;
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gint src_bpp;
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gint dst_bpp;
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gint x,y;
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guchar temp_rgba[4] = {0,0,0,0};
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/* Make sure conversion supported */
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if (!_cogl_bitmap_fallback_can_convert (bmp->format, dst_format))
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return FALSE;
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src_bpp = _cogl_get_format_bpp (bmp->format);
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dst_bpp = _cogl_get_format_bpp (dst_format);
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/* Initialize destination bitmap */
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*dst_bmp = *bmp;
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dst_bmp->rowstride = sizeof(guchar) * dst_bpp * dst_bmp->width;
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dst_bmp->format = ((bmp->format & COGL_PREMULT_BIT) |
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(dst_format & COGL_UNPREMULT_MASK));
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/* Allocate a new buffer to hold converted data */
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dst_bmp->data = g_malloc (sizeof(guchar)
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* dst_bmp->height
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* dst_bmp->rowstride);
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/* FIXME: Optimize */
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for (y = 0; y < bmp->height; y++)
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{
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src = (guchar*)bmp->data + y * bmp->rowstride;
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dst = (guchar*)dst_bmp->data + y * dst_bmp->rowstride;
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for (x = 0; x < bmp->width; x++)
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{
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/* FIXME: Would be nice to at least remove this inner
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* branching, but not sure it can be done without
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* rewriting of the whole loop */
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switch (bmp->format & COGL_UNPREMULT_MASK)
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{
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case COGL_PIXEL_FORMAT_G_8:
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_cogl_g_to_rgba (src, temp_rgba); break;
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case COGL_PIXEL_FORMAT_RGB_888:
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_cogl_rgb_to_rgba (src, temp_rgba); break;
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case COGL_PIXEL_FORMAT_BGR_888:
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_cogl_bgr_to_rgba (src, temp_rgba); break;
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case COGL_PIXEL_FORMAT_RGBA_8888:
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_cogl_rgba_to_rgba (src, temp_rgba); break;
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case COGL_PIXEL_FORMAT_BGRA_8888:
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_cogl_bgra_to_rgba (src, temp_rgba); break;
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case COGL_PIXEL_FORMAT_ARGB_8888:
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_cogl_argb_to_rgba (src, temp_rgba); break;
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case COGL_PIXEL_FORMAT_ABGR_8888:
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_cogl_abgr_to_rgba (src, temp_rgba); break;
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default:
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break;
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}
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switch (dst_format & COGL_UNPREMULT_MASK)
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{
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case COGL_PIXEL_FORMAT_G_8:
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_cogl_rgba_to_g (temp_rgba, dst); break;
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case COGL_PIXEL_FORMAT_RGB_888:
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_cogl_rgba_to_rgb (temp_rgba, dst); break;
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case COGL_PIXEL_FORMAT_BGR_888:
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_cogl_rgba_to_bgr (temp_rgba, dst); break;
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case COGL_PIXEL_FORMAT_RGBA_8888:
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_cogl_rgba_to_rgba (temp_rgba, dst); break;
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case COGL_PIXEL_FORMAT_BGRA_8888:
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_cogl_rgba_to_bgra (temp_rgba, dst); break;
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case COGL_PIXEL_FORMAT_ARGB_8888:
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_cogl_rgba_to_argb (temp_rgba, dst); break;
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case COGL_PIXEL_FORMAT_ABGR_8888:
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_cogl_rgba_to_abgr (temp_rgba, dst); break;
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default:
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break;
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}
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src += src_bpp;
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dst += dst_bpp;
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}
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}
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return TRUE;
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}
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gboolean
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_cogl_bitmap_fallback_unpremult (const CoglBitmap *bmp,
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CoglBitmap *dst_bmp)
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{
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guchar *src;
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guchar *dst;
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gint bpp;
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gint x,y;
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/* Make sure format supported for un-premultiplication */
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if (!_cogl_bitmap_fallback_can_unpremult (bmp->format))
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return FALSE;
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bpp = _cogl_get_format_bpp (bmp->format);
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/* Initialize destination bitmap */
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*dst_bmp = *bmp;
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dst_bmp->format = (bmp->format & COGL_UNPREMULT_MASK);
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/* Allocate a new buffer to hold converted data */
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dst_bmp->data = g_malloc (sizeof(guchar)
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* dst_bmp->height
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* dst_bmp->rowstride);
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for (y = 0; y < bmp->height; y++)
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{
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src = (guchar*)bmp->data + y * bmp->rowstride;
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dst = (guchar*)dst_bmp->data + y * dst_bmp->rowstride;
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if (bmp->format & COGL_AFIRST_BIT)
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{
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for (x = 0; x < bmp->width; x++)
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{
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if (src[0] == 0)
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_cogl_unpremult_alpha_0 (src, dst);
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else
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_cogl_unpremult_alpha_first (src, dst);
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src += bpp;
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dst += bpp;
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}
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}
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else
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{
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for (x = 0; x < bmp->width; x++)
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{
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if (src[0] == 0)
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_cogl_unpremult_alpha_0 (src, dst);
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else
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_cogl_unpremult_alpha_last (src, dst);
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src += bpp;
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dst += bpp;
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}
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}
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}
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return TRUE;
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}
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gboolean
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_cogl_bitmap_fallback_premult (const CoglBitmap *bmp,
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CoglBitmap *dst_bmp)
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{
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guchar *src;
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guchar *dst;
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gint bpp;
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gint x,y;
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/* Make sure format supported for un-premultiplication */
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if (!_cogl_bitmap_fallback_can_premult (bmp->format))
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return FALSE;
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bpp = _cogl_get_format_bpp (bmp->format);
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/* Initialize destination bitmap */
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*dst_bmp = *bmp;
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dst_bmp->format |= COGL_PREMULT_BIT;
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/* Allocate a new buffer to hold converted data */
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dst_bmp->data = g_malloc (sizeof(guchar)
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* dst_bmp->height
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* dst_bmp->rowstride);
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for (y = 0; y < bmp->height; y++)
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{
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src = (guchar*)bmp->data + y * bmp->rowstride;
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dst = (guchar*)dst_bmp->data + y * dst_bmp->rowstride;
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if (bmp->format & COGL_AFIRST_BIT)
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{
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for (x = 0; x < bmp->width; x++)
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{
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_cogl_premult_alpha_first (src, dst);
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src += bpp;
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dst += bpp;
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}
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}
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else
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{
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for (x = 0; x < bmp->width; x++)
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{
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_cogl_premult_alpha_last (src, dst);
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src += bpp;
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dst += bpp;
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}
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}
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}
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return TRUE;
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}
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gboolean
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_cogl_bitmap_fallback_from_file (CoglBitmap *bmp,
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const gchar *filename)
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{
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/* FIXME: use jpeglib, libpng, etc. manually maybe */
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return FALSE;
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}
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