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d18b59d9e6
This creates a CoglBitmap which points into an existing buffer in system memory. That way it can be used to create a texture or to read pixel data into. The function replaces the existing internal function _cogl_bitmap_new_from_data but removes the destroy notify call back. If the application wants notification of destruction it can just use the cogl_object_set_user_data function as normal. Internally there is now a convenience function to create a bitmap for system memory and automatically free the buffer using that mechanism. The name of the function is inspired by cairo_image_surface_create_for_data which has similar semantics. Reviewed-by: Robert Bragg <robert@linux.intel.com>
299 lines
8.3 KiB
C
299 lines
8.3 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, see <http://www.gnu.org/licenses/>.
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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-internal.h"
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#include "cogl-bitmap-private.h"
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#include "cogl-context-private.h"
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#include <string.h>
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#ifdef USE_QUARTZ
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#include <ApplicationServices/ApplicationServices.h>
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#elif defined(USE_GDKPIXBUF)
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#endif
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#ifdef USE_QUARTZ
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gboolean
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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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if (width)
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*width = 0;
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if (height)
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*height = 0;
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return TRUE;
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}
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/* the error does not contain the filename as the caller already has it */
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CoglBitmap *
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_cogl_bitmap_from_file (const char *filename,
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GError **error)
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{
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CFURLRef url;
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CGImageSourceRef image_source;
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CGImageRef image;
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int save_errno;
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CFStringRef type;
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gsize width, height, rowstride;
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guint8 *out_data;
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CGColorSpaceRef color_space;
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CGContextRef bitmap_context;
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g_assert (filename != NULL);
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g_assert (error == NULL || *error == NULL);
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url = CFURLCreateFromFileSystemRepresentation (NULL,
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(guchar *) filename,
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strlen (filename),
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false);
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image_source = CGImageSourceCreateWithURL (url, NULL);
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save_errno = errno;
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CFRelease (url);
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if (image_source == NULL)
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{
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/* doesn't exist, not readable, etc. */
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g_set_error_literal (error,
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COGL_BITMAP_ERROR,
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COGL_BITMAP_ERROR_FAILED,
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g_strerror (save_errno));
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return NULL;
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}
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/* Unknown images would be cleanly caught as zero width/height below, but try
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* to provide better error message
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*/
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type = CGImageSourceGetType (image_source);
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if (type == NULL)
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{
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CFRelease (image_source);
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g_set_error_literal (error,
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COGL_BITMAP_ERROR,
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COGL_BITMAP_ERROR_UNKNOWN_TYPE,
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"Unknown image type");
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return NULL;
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}
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CFRelease (type);
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image = CGImageSourceCreateImageAtIndex (image_source, 0, NULL);
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CFRelease (image_source);
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width = CGImageGetWidth (image);
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height = CGImageGetHeight (image);
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if (width == 0 || height == 0)
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{
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/* incomplete or corrupt */
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CFRelease (image);
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g_set_error_literal (error,
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COGL_BITMAP_ERROR,
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COGL_BITMAP_ERROR_CORRUPT_IMAGE,
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"Image has zero width or height");
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return NULL;
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}
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/* allocate buffer big enough to hold pixel data */
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rowstride = 4 * width;
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out_data = g_malloc0 (height * rowstride);
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/* render to buffer */
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color_space = CGColorSpaceCreateWithName (kCGColorSpaceGenericRGB);
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bitmap_context = CGBitmapContextCreate (out_data,
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width, height, 8,
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rowstride, color_space,
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kCGImageAlphaPremultipliedFirst);
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CGColorSpaceRelease (color_space);
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{
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const CGRect rect = {{0, 0}, {width, height}};
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CGContextDrawImage (bitmap_context, rect, image);
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}
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CGImageRelease (image);
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CGContextRelease (bitmap_context);
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/* store bitmap info */
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return _cogl_bitmap_new_from_data (out_data,
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COGL_PIXEL_FORMAT_ARGB_8888,
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width, height,
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rowstride,
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(CoglBitmapDestroyNotify) g_free,
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NULL);
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}
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#elif defined(USE_GDKPIXBUF)
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gboolean
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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 (const char *filename,
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GError **error)
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{
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static CoglUserDataKey pixbuf_key;
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GdkPixbuf *pixbuf;
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gboolean 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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_COGL_GET_CONTEXT (ctx, NULL);
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_COGL_RETURN_VAL_IF_FAIL (error == NULL || *error == NULL, FALSE);
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/* Load from file using GdkPixbuf */
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pixbuf = gdk_pixbuf_new_from_file (filename, error);
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if (pixbuf == NULL)
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return FALSE;
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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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#else
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#include "stb_image.c"
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gboolean
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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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if (width)
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*width = 0;
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if (height)
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*height = 0;
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return TRUE;
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}
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CoglBitmap *
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_cogl_bitmap_from_file (const char *filename,
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GError **error)
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{
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CoglBitmap *bmp;
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int stb_pixel_format;
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int width;
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int height;
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guint8 *pixels;
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_COGL_RETURN_VAL_IF_FAIL (error == NULL || *error == NULL, FALSE);
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/* Load from file using stb */
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pixels = stbi_load (filename,
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&width, &height, &stb_pixel_format,
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STBI_rgb_alpha);
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if (pixels == NULL)
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return FALSE;
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/* Store bitmap info */
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bmp = _cogl_bitmap_new_from_data (g_memdup (pixels, height * width * 4),
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COGL_PIXEL_FORMAT_RGBA_8888,
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width, height,
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width * 4,
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(CoglBitmapDestroyNotify) g_free,
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NULL);
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free (pixels);
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return bmp;
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}
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#endif
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