c5205c50d2
The docs for GdkPixbuf say that the last row of the image won't necessarily be allocated to the size of the full rowstride. The rest of Cogl and possibly GL assumes that we can copy the bitmap with memcpy(height*rowstride) so we previously would copy the pixbuf data to ensure this. However if the rowstride is the same as bpp*width then there is no way for the last row to be under-allocated so in this case we can just directly upload from the gdk pixbuf. Now that CoglBitmap can be created with a destroy function we can make it keep a reference to the pixbuf and unref it during its destroy callback. GdkPixbuf seems to always pack the image with no padding between rows even if it is RGB so this should end up always avoiding the memcpy. The fallback code for when we do have to copy the pixbuf is now simplified so that it copies all of the rows in a single loop. We only copy the useful region of each row so this should be safe. The rowstride of the CoglBitmap is now always allocated to bpp*width regardless of the rowstride of the pixbuf.
335 lines
9.1 KiB
C
335 lines
9.1 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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guint8 *pixels;
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guint8 *out_data;
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guint8 *out;
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int r;
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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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/* If the pixbuf is tightly packed then we can create a bitmap that
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directly keeps a reference to the pixbuf to avoid copying the
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data. Otherwise we need to copy because according to the
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GdkPixbuf docs we can't be sure whether the last row will be
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allocated to the length of the full rowstride. */
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if (rowstride == n_channels * width)
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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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pixels = gdk_pixbuf_get_pixels (pixbuf);
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out_data = g_malloc (height * n_channels * width);
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out = out_data;
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for (r = 0; r < height; ++r)
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{
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memcpy (out, pixels, n_channels * width);
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pixels += rowstride;
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out += n_channels * width;
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}
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/* Destroy GdkPixbuf object */
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g_object_unref (pixbuf);
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return _cogl_bitmap_new_from_data (out_data,
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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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(CoglBitmapDestroyNotify) g_free,
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NULL);
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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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