4a7dbc0e4e
Cogl no longer has any code that assumes the buffer in a CoglBitmap is allocated to the full size of height*rowstride. We should comment that this is the case so that we remember to keep it that way. This is important for cogl_texture_new_from_data because the application may have created the data from a sub-region of a larger image and in that case it's not safe to read the full rowstride of the last row when the sub region contains the last row of the larger image. http://bugzilla.clutter-project.org/show_bug.cgi?id=2491
309 lines
8.3 KiB
C
309 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.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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#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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gboolean
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_cogl_bitmap_can_convert (CoglPixelFormat src, CoglPixelFormat dst)
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{
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return FALSE;
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}
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gboolean
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_cogl_bitmap_can_unpremult (CoglPixelFormat format)
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{
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return FALSE;
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}
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gboolean
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_cogl_bitmap_can_premult (CoglPixelFormat format)
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{
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return FALSE;
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}
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CoglBitmap *
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_cogl_bitmap_convert (CoglBitmap *bmp,
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CoglPixelFormat dst_format)
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{
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return NULL;
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}
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gboolean
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_cogl_bitmap_unpremult (CoglBitmap *dst_bmp)
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{
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return FALSE;
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}
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gboolean
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_cogl_bitmap_premult (CoglBitmap *dst_bmp)
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{
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return FALSE;
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}
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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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g_assert (filename != NULL);
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g_assert (error == NULL || *error == NULL);
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CFURLRef url = CFURLCreateFromFileSystemRepresentation (NULL, (guchar*)filename, strlen(filename), false);
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CGImageSourceRef image_source = CGImageSourceCreateWithURL (url, NULL);
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int 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 (error, COGL_BITMAP_ERROR, COGL_BITMAP_ERROR_FAILED,
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"%s", 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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CFStringRef 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 (error, COGL_BITMAP_ERROR, 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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CGImageRef image = CGImageSourceCreateImageAtIndex (image_source, 0, NULL);
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CFRelease (image_source);
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gsize width = CGImageGetWidth (image);
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gsize 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 (error, COGL_BITMAP_ERROR, 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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gsize rowstride;
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rowstride = 4 * width;
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guint8 *out_data = g_malloc0 (height * rowstride);
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/* render to buffer */
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CGColorSpaceRef color_space = CGColorSpaceCreateWithName (kCGColorSpaceGenericRGB);
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CGContextRef 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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const CGRect rect = {{0, 0}, {width, height}};
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CGContextDrawImage (bitmap_context, rect, image);
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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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g_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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static void
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_cogl_bitmap_unref_pixbuf (guint8 *pixels,
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void *pixbuf)
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{
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g_object_unref (pixbuf);
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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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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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g_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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return _cogl_bitmap_new_from_data (gdk_pixbuf_get_pixels (pixbuf),
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pixel_format,
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width,
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height,
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rowstride,
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_cogl_bitmap_unref_pixbuf,
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pixbuf);
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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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g_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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