/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2007,2008,2009 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl.h"
#include "cogl-internal.h"
#include "cogl-bitmap-private.h"
#include <string.h>
#ifdef USE_QUARTZ
#include <ApplicationServices/ApplicationServices.h>
#elif defined(USE_GDKPIXBUF)
#include <gdk-pixbuf/gdk-pixbuf.h>
#endif
gboolean
_cogl_bitmap_can_convert (CoglPixelFormat src, CoglPixelFormat dst)
{
return FALSE;
}
gboolean
_cogl_bitmap_can_unpremult (CoglPixelFormat format)
{
return FALSE;
}
gboolean
_cogl_bitmap_can_premult (CoglPixelFormat format)
{
return FALSE;
}
gboolean
_cogl_bitmap_convert (const CoglBitmap *bmp,
CoglBitmap *dst_bmp,
CoglPixelFormat dst_format)
{
return FALSE;
}
gboolean
_cogl_bitmap_unpremult (const CoglBitmap *bmp,
CoglBitmap *dst_bmp)
{
return FALSE;
}
gboolean
_cogl_bitmap_premult (const CoglBitmap *bmp,
CoglBitmap *dst_bmp)
{
return FALSE;
}
#ifdef USE_QUARTZ
/* lacking GdkPixbuf and other useful GError domains, define one of our own */
#define COGL_BITMAP_ERROR cogl_bitmap_error_quark ()
typedef enum {
COGL_BITMAP_ERROR_FAILED,
COGL_BITMAP_ERROR_UNKNOWN_TYPE,
COGL_BITMAP_ERROR_CORRUPT_IMAGE
} CoglBitmapError;
GQuark
cogl_bitmap_error_quark (void)
{
return g_quark_from_static_string ("cogl-bitmap-error-quark");
}
gboolean
_cogl_bitmap_get_size_from_file (const gchar *filename,
gint *width,
gint *height)
{
if (width)
*width = 0;
if (height)
*height = 0;
return TRUE;
}
/* the error does not contain the filename as the caller already has it */
gboolean
_cogl_bitmap_from_file (CoglBitmap *bmp,
const gchar *filename,
GError **error)
{
g_assert (bmp != NULL);
g_assert (filename != NULL);
g_assert (error == NULL || *error == NULL);
CFURLRef url = CFURLCreateFromFileSystemRepresentation (NULL, (guchar*)filename, strlen(filename), false);
CGImageSourceRef image_source = CGImageSourceCreateWithURL (url, NULL);
int save_errno = errno;
CFRelease (url);
if (image_source == NULL)
{
/* doesn't exist, not readable, etc. */
g_set_error (error, COGL_BITMAP_ERROR, COGL_BITMAP_ERROR_FAILED,
"%s", g_strerror (save_errno));
return FALSE;
}
/* Unknown images would be cleanly caught as zero width/height below, but try
* to provide better error message
*/
CFStringRef type = CGImageSourceGetType (image_source);
if (type == NULL)
{
CFRelease (image_source);
g_set_error (error, COGL_BITMAP_ERROR, COGL_BITMAP_ERROR_UNKNOWN_TYPE,
"Unknown image type");
return FALSE;
}
CFRelease (type);
CGImageRef image = CGImageSourceCreateImageAtIndex (image_source, 0, NULL);
CFRelease (image_source);
size_t width = CGImageGetWidth (image);
size_t height = CGImageGetHeight (image);
if (width == 0 || height == 0)
{
/* incomplete or corrupt */
CFRelease (image);
g_set_error (error, COGL_BITMAP_ERROR, COGL_BITMAP_ERROR_CORRUPT_IMAGE,
"Image has zero width or height");
return FALSE;
}
/* allocate buffer big enough to hold pixel data */
size_t rowstride;
CGBitmapInfo bitmap_info = CGImageGetBitmapInfo (image);
if ((bitmap_info & kCGBitmapAlphaInfoMask) == kCGImageAlphaNone)
{
bitmap_info = kCGImageAlphaNone;
rowstride = 3 * width;
}
else
{
bitmap_info = kCGImageAlphaPremultipliedFirst;
rowstride = 4 * width;
}
guint8 *out_data = g_malloc0 (height * rowstride);
/* render to buffer */
CGColorSpaceRef color_space = CGColorSpaceCreateWithName (kCGColorSpaceGenericRGB);
CGContextRef bitmap_context = CGBitmapContextCreate (out_data,
width, height, 8,
rowstride, color_space,
bitmap_info);
CGColorSpaceRelease (color_space);
const CGRect rect = {{0, 0}, {width, height}};
CGContextDrawImage (bitmap_context, rect, image);
CGImageRelease (image);
CGContextRelease (bitmap_context);
/* store bitmap info */
bmp->data = out_data;
bmp->format = bitmap_info == kCGImageAlphaPremultipliedFirst
? COGL_PIXEL_FORMAT_ARGB_8888
: COGL_PIXEL_FORMAT_RGB_888;
bmp->width = width;
bmp->height = height;
bmp->rowstride = rowstride;
return TRUE;
}
#elif defined(USE_GDKPIXBUF)
gboolean
_cogl_bitmap_get_size_from_file (const gchar *filename,
gint *width,
gint *height)
{
g_return_val_if_fail (filename != NULL, FALSE);
if (gdk_pixbuf_get_file_info (filename, width, height) != NULL)
return TRUE;
return FALSE;
}
gboolean
_cogl_bitmap_from_file (CoglBitmap *bmp,
const gchar *filename,
GError **error)
{
GdkPixbuf *pixbuf;
gboolean has_alpha;
GdkColorspace color_space;
CoglPixelFormat pixel_format;
gint width;
gint height;
gint rowstride;
gint bits_per_sample;
gint n_channels;
gint last_row_size;
guchar *pixels;
guchar *out_data;
guchar *out;
gint r;
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
if (bmp == NULL)
return FALSE;
/* Load from file using GdkPixbuf */
pixbuf = gdk_pixbuf_new_from_file (filename, error);
if (pixbuf == NULL)
return FALSE;
/* Get pixbuf properties */
has_alpha = gdk_pixbuf_get_has_alpha (pixbuf);
color_space = gdk_pixbuf_get_colorspace (pixbuf);
width = gdk_pixbuf_get_width (pixbuf);
height = gdk_pixbuf_get_height (pixbuf);
rowstride = gdk_pixbuf_get_rowstride (pixbuf);
bits_per_sample = gdk_pixbuf_get_bits_per_sample (pixbuf);
n_channels = gdk_pixbuf_get_n_channels (pixbuf);
/* The docs say this is the right way */
last_row_size = width * ((n_channels * bits_per_sample + 7) / 8);
/* According to current docs this should be true and so
* the translation to cogl pixel format below valid */
g_assert (bits_per_sample == 8);
if (has_alpha)
g_assert (n_channels == 4);
else
g_assert (n_channels == 3);
/* Translate to cogl pixel format */
switch (color_space)
{
case GDK_COLORSPACE_RGB:
/* The only format supported by GdkPixbuf so far */
pixel_format = has_alpha ?
COGL_PIXEL_FORMAT_RGBA_8888 :
COGL_PIXEL_FORMAT_RGB_888;
break;
default:
/* Ouch, spec changed! */
g_object_unref (pixbuf);
return FALSE;
}
/* FIXME: Any way to destroy pixbuf but retain pixel data? */
pixels = gdk_pixbuf_get_pixels (pixbuf);
out_data = (guchar*) g_malloc (height * rowstride);
out = out_data;
/* Copy up to last row */
for (r = 0; r < height-1; ++r)
{
memcpy (out, pixels, rowstride);
pixels += rowstride;
out += rowstride;
}
/* Copy last row */
memcpy (out, pixels, last_row_size);
/* Destroy GdkPixbuf object */
g_object_unref (pixbuf);
/* Store bitmap info */
bmp->data = out_data; /* The stored data the same alignment constraints as a
* gdkpixbuf but stores a full rowstride in the last
* scanline
*/
bmp->format = pixel_format;
bmp->width = width;
bmp->height = height;
bmp->rowstride = rowstride;
return TRUE;
}
#else
#include "stb_image.c"
gboolean
_cogl_bitmap_get_size_from_file (const gchar *filename,
gint *width,
gint *height)
{
if (width)
*width = 0;
if (height)
*height = 0;
return TRUE;
}
gboolean
_cogl_bitmap_from_file (CoglBitmap *bmp,
const gchar *filename,
GError **error)
{
gint stb_pixel_format;
gint width;
gint height;
guchar *pixels;
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
if (bmp == NULL)
return FALSE;
/* Load from file using stb */
pixels = stbi_load (filename,
&width, &height, &stb_pixel_format,
STBI_rgb_alpha);
if (pixels == NULL)
return FALSE;
/* Store bitmap info */
bmp->data = g_memdup (pixels, height * width * 4);
bmp->format = COGL_PIXEL_FORMAT_RGBA_8888;
bmp->width = width;
bmp->height = height;
bmp->rowstride = width * 4;
free (pixels);
return TRUE;
}
#endif