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mutter-performance-source/cogl/cogl-bitmap-pixbuf.c
Robert Bragg 1686e754a7 bitmap: Adds cogl_android_bitmap_new_from_asset() 
This adds some android specific api for creating a CoglBitmap from an
Android asset.

As part of the work it also seemed like a good time to change the
internal bitmap constructors to take an explicit CoglContext argument
and so the public cogl_bitmap_new_from_file() api was also changed
accordingly to take a CoglContext pointer as the first argument.

Reviewed-by: Neil Roberts <neil@linux.intel.com>

(cherry picked from commit 099d6d1b505b55bbd09c50d081deb41ab5764e19)

  Since we aren't able to break APIs on the 1.12 branch this cherry-pick
  skips the change to cogl_bitmap_new_from_file()
2012-08-06 18:50:22 +01:00

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/*
* 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, see <http://www.gnu.org/licenses/>.
*
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl-util.h"
#include "cogl-internal.h"
#include "cogl-bitmap-private.h"
#include "cogl-context-private.h"
#include "cogl-private.h"
#include <string.h>
#ifdef USE_QUARTZ
#include <ApplicationServices/ApplicationServices.h>
#elif defined(USE_GDKPIXBUF)
#include <gdk-pixbuf/gdk-pixbuf.h>
#endif
#ifdef USE_QUARTZ
CoglBool
_cogl_bitmap_get_size_from_file (const char *filename,
int *width,
int *height)
{
if (width)
*width = 0;
if (height)
*height = 0;
return TRUE;
}
/* the error does not contain the filename as the caller already has it */
CoglBitmap *
_cogl_bitmap_from_file (CoglContext *ctx,
const char *filename,
GError **error)
{
CFURLRef url;
CGImageSourceRef image_source;
CGImageRef image;
int save_errno;
CFStringRef type;
size_t width, height, rowstride;
uint8_t *out_data;
CGColorSpaceRef color_space;
CGContextRef bitmap_context;
CoglBitmap *bmp;
url = CFURLCreateFromFileSystemRepresentation (NULL,
(guchar *) filename,
strlen (filename),
false);
image_source = CGImageSourceCreateWithURL (url, NULL);
save_errno = errno;
CFRelease (url);
if (image_source == NULL)
{
/* doesn't exist, not readable, etc. */
g_set_error_literal (error,
COGL_BITMAP_ERROR,
COGL_BITMAP_ERROR_FAILED,
g_strerror (save_errno));
return NULL;
}
/* Unknown images would be cleanly caught as zero width/height below, but try
* to provide better error message
*/
type = CGImageSourceGetType (image_source);
if (type == NULL)
{
CFRelease (image_source);
g_set_error_literal (error,
COGL_BITMAP_ERROR,
COGL_BITMAP_ERROR_UNKNOWN_TYPE,
"Unknown image type");
return NULL;
}
CFRelease (type);
image = CGImageSourceCreateImageAtIndex (image_source, 0, NULL);
CFRelease (image_source);
width = CGImageGetWidth (image);
height = CGImageGetHeight (image);
if (width == 0 || height == 0)
{
/* incomplete or corrupt */
CFRelease (image);
g_set_error_literal (error,
COGL_BITMAP_ERROR,
COGL_BITMAP_ERROR_CORRUPT_IMAGE,
"Image has zero width or height");
return NULL;
}
/* allocate buffer big enough to hold pixel data */
bmp = _cogl_bitmap_new_with_malloc_buffer (ctx,
width, height,
COGL_PIXEL_FORMAT_ARGB_8888);
rowstride = cogl_bitmap_get_rowstride (bmp);
out_data = _cogl_bitmap_map (bmp,
COGL_BUFFER_ACCESS_WRITE,
COGL_BUFFER_MAP_HINT_DISCARD);
/* render to buffer */
color_space = CGColorSpaceCreateWithName (kCGColorSpaceGenericRGB);
bitmap_context = CGBitmapContextCreate (out_data,
width, height, 8,
rowstride, color_space,
kCGImageAlphaPremultipliedFirst);
CGColorSpaceRelease (color_space);
{
const CGRect rect = {{0, 0}, {width, height}};
CGContextDrawImage (bitmap_context, rect, image);
}
CGImageRelease (image);
CGContextRelease (bitmap_context);
_cogl_bitmap_unmap (bmp);
/* store bitmap info */
return bmp;
}
#elif defined(USE_GDKPIXBUF)
CoglBool
_cogl_bitmap_get_size_from_file (const char *filename,
int *width,
int *height)
{
_COGL_RETURN_VAL_IF_FAIL (filename != NULL, FALSE);
if (gdk_pixbuf_get_file_info (filename, width, height) != NULL)
return TRUE;
return FALSE;
}
CoglBitmap *
_cogl_bitmap_from_file (CoglContext *ctx,
const char *filename,
GError **error)
{
static CoglUserDataKey pixbuf_key;
GdkPixbuf *pixbuf;
CoglBool has_alpha;
GdkColorspace color_space;
CoglPixelFormat pixel_format;
int width;
int height;
int rowstride;
int bits_per_sample;
int n_channels;
CoglBitmap *bmp;
/* 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);
/* 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;
}
/* We just use the data directly from the pixbuf so that we don't
have to copy to a seperate buffer. Note that Cogl is expected not
to read past the end of bpp*width on the last row even if the
rowstride is much larger so we don't need to worry about
GdkPixbuf's semantics that it may under-allocate the buffer. */
bmp = cogl_bitmap_new_for_data (ctx,
width,
height,
pixel_format,
rowstride,
gdk_pixbuf_get_pixels (pixbuf));
cogl_object_set_user_data (COGL_OBJECT (bmp),
&pixbuf_key,
pixbuf,
g_object_unref);
return bmp;
}
#else
#include "stb_image.c"
CoglBool
_cogl_bitmap_get_size_from_file (const char *filename,
int *width,
int *height)
{
if (width)
*width = 0;
if (height)
*height = 0;
return TRUE;
}
/* stb_image.c supports an STBI_grey_alpha format which we don't have
* a corresponding CoglPixelFormat for so as a special case we
* convert this to rgba8888.
*
* If we have a use case where this is an important format to consider
* then it could be worth adding a corresponding CoglPixelFormat
* instead.
*/
static uint8_t *
convert_ra_88_to_rgba_8888 (uint8_t *pixels,
int width,
int height)
{
int x, y;
uint8_t *buf;
size_t in_stride = width * 2;
size_t out_stride = width * 4;
buf = malloc (width * height * 4);
if (buf)
return NULL;
for (y = 0; y < height; y++)
for (x = 0; x < width; x++)
{
uint8_t *src = pixels + in_stride * y + 2 * x;
uint8_t *dst = buf + out_stride * y + 4 * x;
dst[0] = src[0];
dst[1] = src[0];
dst[2] = src[0];
dst[3] = src[1];
}
return buf;
}
static CoglBitmap *
_cogl_bitmap_new_from_stb_pixels (CoglContext *ctx,
uint8_t *pixels,
int stb_pixel_format,
int width,
int height,
GError **error)
{
static CoglUserDataKey bitmap_data_key;
CoglBitmap *bmp;
CoglPixelFormat cogl_format;
size_t stride;
if (pixels == NULL)
{
g_set_error_literal (error,
COGL_BITMAP_ERROR,
COGL_BITMAP_ERROR_FAILED,
"Failed to load image with stb image library");
return NULL;
}
switch (stb_pixel_format)
{
case STBI_grey:
cogl_format = COGL_PIXEL_FORMAT_A_8;
break;
case STBI_grey_alpha:
{
uint8_t *tmp = pixels;
pixels = convert_ra_88_to_rgba_8888 (pixels, width, height);
free (tmp);
if (!pixels)
{
g_set_error_literal (error,
COGL_BITMAP_ERROR,
COGL_BITMAP_ERROR_FAILED,
"Failed to alloc memory to convert "
"gray_alpha to rgba8888");
return NULL;
}
cogl_format = COGL_PIXEL_FORMAT_RGBA_8888;
break;
}
case STBI_rgb:
cogl_format = COGL_PIXEL_FORMAT_RGB_888;
break;
case STBI_rgb_alpha:
cogl_format = COGL_PIXEL_FORMAT_RGBA_8888;
break;
default:
g_warn_if_reached ();
return NULL;
}
stride = width * _cogl_pixel_format_get_bytes_per_pixel (cogl_format);
/* Store bitmap info */
bmp = cogl_bitmap_new_for_data (ctx,
width, height,
cogl_format,
stride,
pixels);
/* Register a destroy function so the pixel data will be freed
automatically when the bitmap object is destroyed */
cogl_object_set_user_data (COGL_OBJECT (bmp), &bitmap_data_key, pixels, free);
return bmp;
}
CoglBitmap *
_cogl_bitmap_from_file (CoglContext *ctx,
const char *filename,
GError **error)
{
int stb_pixel_format;
int width;
int height;
uint8_t *pixels;
pixels = stbi_load (filename,
&width, &height, &stb_pixel_format,
STBI_default);
return _cogl_bitmap_new_from_stb_pixels (ctx, pixels, stb_pixel_format,
width, height,
error);
}
#ifdef COGL_HAS_ANDROID_SUPPORT
CoglBitmap *
_cogl_android_bitmap_new_from_asset (CoglContext *ctx,
AAssetManager *manager,
const char *filename,
GError **error)
{
AAsset *asset;
const void *data;
off_t len;
int stb_pixel_format;
int width;
int height;
uint8_t *pixels;
CoglBitmap *bmp;
asset = AAssetManager_open (manager, filename, AASSET_MODE_BUFFER);
if (!asset)
{
g_set_error_literal (error,
COGL_BITMAP_ERROR,
COGL_BITMAP_ERROR_FAILED,
"Failed to open asset");
return NULL;
}
data = AAsset_getBuffer (asset);
if (!data)
{
g_set_error_literal (error,
COGL_BITMAP_ERROR,
COGL_BITMAP_ERROR_FAILED,
"Failed to ::getBuffer from asset");
return NULL;
}
len = AAsset_getLength (asset);
pixels = stbi_load_from_memory (data, len,
&width, &height,
&stb_pixel_format, STBI_default);
bmp = _cogl_bitmap_new_from_stb_pixels (ctx, pixels, stb_pixel_format,
width, height,
error);
AAsset_close (asset);
return bmp;
}
#endif
#endif
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