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mutter/cogl/cogl-bitmap.c
Neil Roberts 76c2bd8420 cogl-bitmap: Add a public accessor for the underlying pixel buffer 
This adds a small cogl_bitmap_get_buffer public function. Note that
this can return NULL if the bitmap was not created with a pixel
buffer. It might be nice to change this eventually so that all bitmaps
have a pixel buffer.

Reviewed-by: Robert Bragg <robert@linux.intel.com>
2012-03-05 19:02:29 +00:00

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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-debug.h"
#include "cogl-private.h"
#include "cogl-bitmap-private.h"
#include "cogl-buffer-private.h"
#include "cogl-pixel-buffer.h"
#include <string.h>
struct _CoglBitmap
{
CoglHandleObject _parent;
CoglPixelFormat format;
int width;
int height;
int rowstride;
guint8 *data;
CoglBitmapDestroyNotify destroy_fn;
void *destroy_fn_data;
gboolean mapped;
gboolean bound;
/* If this is non-null then 'data' is ignored and instead it is
fetched from this shared bitmap. */
CoglBitmap *shared_bmp;
/* If this is non-null then 'data' is treated as an offset into the
buffer and map will divert to mapping the buffer */
CoglBuffer *buffer;
};
static void _cogl_bitmap_free (CoglBitmap *bmp);
COGL_OBJECT_DEFINE (Bitmap, bitmap);
static void
_cogl_bitmap_free (CoglBitmap *bmp)
{
g_assert (!bmp->mapped);
g_assert (!bmp->bound);
if (bmp->destroy_fn)
bmp->destroy_fn (bmp->data, bmp->destroy_fn_data);
if (bmp->shared_bmp)
cogl_object_unref (bmp->shared_bmp);
if (bmp->buffer)
cogl_object_unref (bmp->buffer);
g_slice_free (CoglBitmap, bmp);
}
gboolean
_cogl_bitmap_convert_premult_status (CoglBitmap *bmp,
CoglPixelFormat dst_format)
{
/* Do we need to unpremultiply? */
if ((bmp->format & COGL_PREMULT_BIT) > 0 &&
(dst_format & COGL_PREMULT_BIT) == 0 &&
COGL_PIXEL_FORMAT_CAN_HAVE_PREMULT (dst_format))
return _cogl_bitmap_unpremult (bmp);
/* Do we need to premultiply? */
if ((bmp->format & COGL_PREMULT_BIT) == 0 &&
COGL_PIXEL_FORMAT_CAN_HAVE_PREMULT (bmp->format) &&
(dst_format & COGL_PREMULT_BIT) > 0)
/* Try premultiplying using imaging library */
return _cogl_bitmap_premult (bmp);
return TRUE;
}
CoglBitmap *
_cogl_bitmap_copy (CoglBitmap *src_bmp)
{
CoglBitmap *dst_bmp;
CoglPixelFormat src_format = cogl_bitmap_get_format (src_bmp);
int bpp = _cogl_pixel_format_get_bytes_per_pixel (src_format);
int width = cogl_bitmap_get_width (src_bmp);
int height = cogl_bitmap_get_height (src_bmp);
int dst_rowstride = width * bpp;
/* Round the rowstride up to the next nearest multiple of 4 bytes */
dst_rowstride = (dst_rowstride + 3) & ~3;
dst_bmp = _cogl_bitmap_new_from_data (g_malloc (dst_rowstride * height),
src_format,
width, height,
dst_rowstride,
(CoglBitmapDestroyNotify) g_free,
NULL);
_cogl_bitmap_copy_subregion (src_bmp,
dst_bmp,
0, 0, /* src_x/y */
0, 0, /* dst_x/y */
width, height);
return dst_bmp;
}
gboolean
_cogl_bitmap_copy_subregion (CoglBitmap *src,
CoglBitmap *dst,
int src_x,
int src_y,
int dst_x,
int dst_y,
int width,
int height)
{
guint8 *srcdata;
guint8 *dstdata;
int bpp;
int line;
gboolean succeeded = FALSE;
/* Intended only for fast copies when format is equal! */
g_assert ((src->format & ~COGL_PREMULT_BIT) ==
(dst->format & ~COGL_PREMULT_BIT));
bpp = _cogl_pixel_format_get_bytes_per_pixel (src->format);
if ((srcdata = _cogl_bitmap_map (src, COGL_BUFFER_ACCESS_READ, 0)))
{
if ((dstdata = _cogl_bitmap_map (dst, COGL_BUFFER_ACCESS_WRITE, 0)))
{
srcdata += src_y * src->rowstride + src_x * bpp;
dstdata += dst_y * dst->rowstride + dst_x * bpp;
for (line=0; line<height; ++line)
{
memcpy (dstdata, srcdata, width * bpp);
srcdata += src->rowstride;
dstdata += dst->rowstride;
}
succeeded = TRUE;
_cogl_bitmap_unmap (dst);
}
_cogl_bitmap_unmap (src);
}
return succeeded;
}
gboolean
cogl_bitmap_get_size_from_file (const char *filename,
int *width,
int *height)
{
return _cogl_bitmap_get_size_from_file (filename, width, height);
}
CoglBitmap *
_cogl_bitmap_new_from_data (guint8 *data,
CoglPixelFormat format,
int width,
int height,
int rowstride,
CoglBitmapDestroyNotify destroy_fn,
void *destroy_fn_data)
{
CoglBitmap *bmp = g_slice_new (CoglBitmap);
bmp->format = format;
bmp->width = width;
bmp->height = height;
bmp->rowstride = rowstride;
bmp->data = data;
bmp->destroy_fn = destroy_fn;
bmp->destroy_fn_data = destroy_fn_data;
bmp->mapped = FALSE;
bmp->bound = FALSE;
bmp->shared_bmp = NULL;
bmp->buffer = NULL;
return _cogl_bitmap_object_new (bmp);
}
CoglBitmap *
_cogl_bitmap_new_shared (CoglBitmap *shared_bmp,
CoglPixelFormat format,
int width,
int height,
int rowstride)
{
CoglBitmap *bmp = _cogl_bitmap_new_from_data (NULL, /* data */
format,
width,
height,
rowstride,
NULL, /* destroy_fn */
NULL /* destroy_fn_data */);
bmp->shared_bmp = cogl_object_ref (shared_bmp);
return bmp;
}
CoglBitmap *
cogl_bitmap_new_from_file (const char *filename,
GError **error)
{
_COGL_RETURN_VAL_IF_FAIL (error == NULL || *error == NULL, COGL_INVALID_HANDLE);
return _cogl_bitmap_from_file (filename, error);
}
CoglBitmap *
cogl_bitmap_new_from_buffer (CoglBuffer *buffer,
CoglPixelFormat format,
int width,
int height,
int rowstride,
int offset)
{
CoglBitmap *bmp;
_COGL_RETURN_VAL_IF_FAIL (cogl_is_buffer (buffer), NULL);
bmp = _cogl_bitmap_new_from_data (NULL, /* data */
format,
width,
height,
rowstride,
NULL, /* destroy_fn */
NULL /* destroy_fn_data */);
bmp->buffer = cogl_object_ref (buffer);
bmp->data = GINT_TO_POINTER (offset);
return bmp;
}
CoglBitmap *
cogl_bitmap_new_with_size (CoglContext *context,
unsigned int width,
unsigned int height,
CoglPixelFormat format)
{
CoglPixelBuffer *pixel_buffer;
CoglBitmap *bitmap;
unsigned int rowstride;
/* creating a buffer to store "any" format does not make sense */
if (G_UNLIKELY (format == COGL_PIXEL_FORMAT_ANY))
return NULL;
/* for now we fallback to cogl_pixel_buffer_new, later, we could ask
* libdrm a tiled buffer for instance */
rowstride = width * _cogl_pixel_format_get_bytes_per_pixel (format);
pixel_buffer = cogl_pixel_buffer_new (context, height * rowstride, NULL);
if (G_UNLIKELY (pixel_buffer == NULL))
return NULL;
bitmap = cogl_bitmap_new_from_buffer (COGL_BUFFER (pixel_buffer),
format,
width, height,
rowstride,
0 /* offset */);
cogl_object_unref (pixel_buffer);
return bitmap;
}
CoglPixelFormat
cogl_bitmap_get_format (CoglBitmap *bitmap)
{
return bitmap->format;
}
void
_cogl_bitmap_set_format (CoglBitmap *bitmap,
CoglPixelFormat format)
{
bitmap->format = format;
}
int
cogl_bitmap_get_width (CoglBitmap *bitmap)
{
return bitmap->width;
}
int
cogl_bitmap_get_height (CoglBitmap *bitmap)
{
return bitmap->height;
}
int
cogl_bitmap_get_rowstride (CoglBitmap *bitmap)
{
return bitmap->rowstride;
}
CoglPixelBuffer *
cogl_bitmap_get_buffer (CoglBitmap *bitmap)
{
while (bitmap->shared_bmp)
bitmap = bitmap->shared_bmp;
return COGL_PIXEL_BUFFER (bitmap->buffer);
}
GQuark
cogl_bitmap_error_quark (void)
{
return g_quark_from_static_string ("cogl-bitmap-error-quark");
}
guint8 *
_cogl_bitmap_map (CoglBitmap *bitmap,
CoglBufferAccess access,
CoglBufferMapHint hints)
{
/* Divert to another bitmap if this data is shared */
if (bitmap->shared_bmp)
return _cogl_bitmap_map (bitmap->shared_bmp, access, hints);
g_assert (!bitmap->mapped);
if (bitmap->buffer)
{
guint8 *data = cogl_buffer_map (bitmap->buffer,
access,
hints);
COGL_NOTE (BITMAP, "A pixel array is being mapped from a bitmap. This "
"usually means that some conversion on the pixel array is "
"needed so a sub-optimal format is being used.");
if (data)
{
bitmap->mapped = TRUE;
return data + GPOINTER_TO_INT (bitmap->data);
}
else
return NULL;
}
else
{
bitmap->mapped = TRUE;
return bitmap->data;
}
}
void
_cogl_bitmap_unmap (CoglBitmap *bitmap)
{
/* Divert to another bitmap if this data is shared */
if (bitmap->shared_bmp)
{
_cogl_bitmap_unmap (bitmap->shared_bmp);
return;
}
g_assert (bitmap->mapped);
bitmap->mapped = FALSE;
if (bitmap->buffer)
cogl_buffer_unmap (bitmap->buffer);
}
guint8 *
_cogl_bitmap_bind (CoglBitmap *bitmap,
CoglBufferAccess access,
CoglBufferMapHint hints)
{
guint8 *ptr;
/* Divert to another bitmap if this data is shared */
if (bitmap->shared_bmp)
return _cogl_bitmap_bind (bitmap->shared_bmp, access, hints);
g_assert (!bitmap->bound);
/* If the bitmap wasn't created from a buffer then the
implementation of bind is the same as map */
if (bitmap->buffer == NULL)
{
guint8 *data = _cogl_bitmap_map (bitmap, access, hints);
if (data)
bitmap->bound = TRUE;
return data;
}
bitmap->bound = TRUE;
if (access == COGL_BUFFER_ACCESS_READ)
ptr = _cogl_buffer_bind (bitmap->buffer,
COGL_BUFFER_BIND_TARGET_PIXEL_UNPACK);
else if (access == COGL_BUFFER_ACCESS_WRITE)
ptr = _cogl_buffer_bind (bitmap->buffer,
COGL_BUFFER_BIND_TARGET_PIXEL_PACK);
else
g_assert_not_reached ();
/* The data pointer actually stores the offset */
return GPOINTER_TO_INT (bitmap->data) + ptr;
}
void
_cogl_bitmap_unbind (CoglBitmap *bitmap)
{
/* Divert to another bitmap if this data is shared */
if (bitmap->shared_bmp)
{
_cogl_bitmap_unbind (bitmap->shared_bmp);
return;
}
g_assert (bitmap->bound);
bitmap->bound = FALSE;
/* If the bitmap wasn't created from a pixel array then the
implementation of unbind is the same as unmap */
if (bitmap->buffer)
_cogl_buffer_unbind (bitmap->buffer);
else
_cogl_bitmap_unmap (bitmap);
}
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