137 lines
4.1 KiB
C
137 lines
4.1 KiB
C
/*
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* Cogl
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*
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* A Low Level GPU Graphics and Utilities API
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*
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* Copyright (C) 2007,2008,2009 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*
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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-util.h"
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#include "cogl-bitmap-private.h"
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#include "cogl-context-private.h"
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#include "cogl-private.h"
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#include "cogl-error-private.h"
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#include <string.h>
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#include <gdk-pixbuf/gdk-pixbuf.h>
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CoglBool
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_cogl_bitmap_get_size_from_file (const char *filename,
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int *width,
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int *height)
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{
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_COGL_RETURN_VAL_IF_FAIL (filename != NULL, FALSE);
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if (gdk_pixbuf_get_file_info (filename, width, height) != NULL)
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return TRUE;
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return FALSE;
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}
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CoglBitmap *
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_cogl_bitmap_from_file (CoglContext *ctx,
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const char *filename,
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CoglError **error)
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{
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static CoglUserDataKey pixbuf_key;
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GdkPixbuf *pixbuf;
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CoglBool has_alpha;
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GdkColorspace color_space;
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CoglPixelFormat pixel_format;
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int width;
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int height;
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int rowstride;
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int bits_per_sample;
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int n_channels;
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CoglBitmap *bmp;
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GError *glib_error = NULL;
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/* Load from file using GdkPixbuf */
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pixbuf = gdk_pixbuf_new_from_file (filename, &glib_error);
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if (pixbuf == NULL)
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{
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_cogl_propagate_gerror (error, glib_error);
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return FALSE;
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}
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/* Get pixbuf properties */
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has_alpha = gdk_pixbuf_get_has_alpha (pixbuf);
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color_space = gdk_pixbuf_get_colorspace (pixbuf);
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width = gdk_pixbuf_get_width (pixbuf);
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height = gdk_pixbuf_get_height (pixbuf);
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rowstride = gdk_pixbuf_get_rowstride (pixbuf);
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bits_per_sample = gdk_pixbuf_get_bits_per_sample (pixbuf);
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n_channels = gdk_pixbuf_get_n_channels (pixbuf);
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/* According to current docs this should be true and so
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* the translation to cogl pixel format below valid */
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g_assert (bits_per_sample == 8);
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if (has_alpha)
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g_assert (n_channels == 4);
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else
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g_assert (n_channels == 3);
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/* Translate to cogl pixel format */
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switch (color_space)
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{
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case GDK_COLORSPACE_RGB:
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/* The only format supported by GdkPixbuf so far */
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pixel_format = has_alpha ?
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COGL_PIXEL_FORMAT_RGBA_8888 :
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COGL_PIXEL_FORMAT_RGB_888;
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break;
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default:
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/* Ouch, spec changed! */
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g_object_unref (pixbuf);
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return FALSE;
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}
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/* We just use the data directly from the pixbuf so that we don't
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have to copy to a seperate buffer. Note that Cogl is expected not
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to read past the end of bpp*width on the last row even if the
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rowstride is much larger so we don't need to worry about
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GdkPixbuf's semantics that it may under-allocate the buffer. */
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bmp = cogl_bitmap_new_for_data (ctx,
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width,
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height,
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pixel_format,
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rowstride,
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gdk_pixbuf_get_pixels (pixbuf));
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cogl_object_set_user_data (COGL_OBJECT (bmp),
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&pixbuf_key,
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pixbuf,
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g_object_unref);
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return bmp;
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}
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