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c78d963e90
For the asynchronous loading we need a function call that parses a file, given its path, and retrieves the image width and height. This commit adds cogl_bitmap_get_size_from_file() to the CoglBitmap API.
358 lines
9.2 KiB
C
358 lines
9.2 KiB
C
/*
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* Clutter COGL
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*
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* A basic GL/GLES Abstraction/Utility Layer
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*
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* Authored By Matthew Allum <mallum@openedhand.com>
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*
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* Copyright (C) 2007 OpenedHand
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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.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_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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return FALSE;
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}
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gboolean
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_cogl_bitmap_unpremult (const CoglBitmap *bmp,
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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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/* lacking GdkPixbuf and other useful GError domains, define one of our own */
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#define COGL_BITMAP_ERROR cogl_bitmap_error_quark ()
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typedef enum {
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COGL_BITMAP_ERROR_FAILED,
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COGL_BITMAP_ERROR_UNKNOWN_TYPE,
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COGL_BITMAP_ERROR_CORRUPT_IMAGE
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} CoglBitmapError;
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GQuark
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cogl_bitmap_error_quark (void)
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{
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return g_quark_from_static_string ("cogl-bitmap-error-quark");
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}
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gboolean
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_cogl_bitmap_get_size_from_file (const gchar *filename,
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gint *width,
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gint *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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gboolean
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_cogl_bitmap_from_file (CoglBitmap *bmp,
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const gchar *filename,
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GError **error)
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{
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g_assert (bmp != NULL);
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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 FALSE;
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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 FALSE;
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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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size_t width = CGImageGetWidth (image);
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size_t 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 FALSE;
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}
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/* allocate buffer big enough to hold pixel data */
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size_t rowstride;
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CGBitmapInfo bitmap_info = CGImageGetBitmapInfo (image);
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if ((bitmap_info & kCGBitmapAlphaInfoMask) == kCGImageAlphaNone)
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{
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bitmap_info = kCGImageAlphaNone;
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rowstride = 3 * width;
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}
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else
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{
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bitmap_info = kCGImageAlphaPremultipliedFirst;
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rowstride = 4 * width;
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}
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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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bitmap_info);
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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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bmp->data = out_data;
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bmp->format = bitmap_info == kCGImageAlphaPremultipliedFirst
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? COGL_PIXEL_FORMAT_ARGB_8888
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: COGL_PIXEL_FORMAT_RGB_888;
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bmp->width = width;
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bmp->height = height;
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bmp->rowstride = rowstride;
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return TRUE;
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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 gchar *filename,
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gint *width,
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gint *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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gboolean
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_cogl_bitmap_from_file (CoglBitmap *bmp,
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const gchar *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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gint width;
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gint height;
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gint rowstride;
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gint bits_per_sample;
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gint n_channels;
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gint last_row_size;
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guchar *pixels;
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guchar *out_data;
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guchar *out;
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gint r;
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g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
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if (bmp == NULL)
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return 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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/* The docs say this is the right way */
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last_row_size = width * ((n_channels * bits_per_sample + 7) / 8);
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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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/* FIXME: Any way to destroy pixbuf but retain pixel data? */
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pixels = gdk_pixbuf_get_pixels (pixbuf);
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out_data = (guchar*) g_malloc (height * rowstride);
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out = out_data;
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/* Copy up to last row */
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for (r = 0; r < height-1; ++r)
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{
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memcpy (out, pixels, rowstride);
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pixels += rowstride;
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out += rowstride;
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}
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/* Copy last row */
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memcpy (out, pixels, last_row_size);
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/* Destroy GdkPixbuf object */
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g_object_unref (pixbuf);
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/* Store bitmap info */
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bmp->data = out_data; /* The stored data the same alignment constraints as a
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* gdkpixbuf but stores a full rowstride in the last
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* scanline
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*/
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bmp->format = pixel_format;
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bmp->width = width;
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bmp->height = height;
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bmp->rowstride = rowstride;
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return TRUE;
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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 gchar *filename,
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gint *width,
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gint *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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gboolean
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_cogl_bitmap_from_file (CoglBitmap *bmp,
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const gchar *filename,
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GError **error)
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{
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gint stb_pixel_format;
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gint width;
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gint height;
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guchar *pixels;
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g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
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if (bmp == NULL)
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return 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->data = g_memdup (pixels, height * width * 4);
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bmp->format = COGL_PIXEL_FORMAT_RGBA_8888;
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bmp->width = width;
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bmp->height = height;
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bmp->rowstride = width * 4;
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free (pixels);
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return TRUE;
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}
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#endif
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