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Add a public cogl_bitmap_new_for_data

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This creates a CoglBitmap which points into an existing buffer in
system memory. That way it can be used to create a texture or to read
pixel data into. The function replaces the existing internal function
_cogl_bitmap_new_from_data but removes the destroy notify call back.
If the application wants notification of destruction it can just use
the cogl_object_set_user_data function as normal. Internally there is
now a convenience function to create a bitmap for system memory and
automatically free the buffer using that mechanism.

The name of the function is inspired by
cairo_image_surface_create_for_data which has similar semantics.

Reviewed-by: Robert Bragg <robert@linux.intel.com>
This commit is contained in:
Neil Roberts
2012-03-13 14:46:18 +00:00
parent f65a895b4f
commit d18b59d9e6
14 changed files with 273 additions and 261 deletions
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20
cogl/cogl-framebuffer.c
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@ -2036,9 +2036,9 @@ cogl_framebuffer_read_pixels_into_bitmap (CoglFramebuffer *framebuffer,
(required_format & ~COGL_PREMULT_BIT) != (format & ~COGL_PREMULT_BIT))
{
CoglBitmap *tmp_bmp;
guint8 *tmp_data;
CoglPixelFormat read_format;
int bpp, rowstride;
guint8 *tmp_data;
int succeeded;
if (ctx->driver == COGL_DRIVER_GL)
@ -2054,22 +2054,24 @@ cogl_framebuffer_read_pixels_into_bitmap (CoglFramebuffer *framebuffer,
read_format = ((read_format & ~COGL_PREMULT_BIT) |
(framebuffer->format & COGL_PREMULT_BIT));
tmp_bmp = _cogl_bitmap_new_with_malloc_buffer (ctx,
width, height,
read_format);
bpp = _cogl_pixel_format_get_bytes_per_pixel (read_format);
rowstride = (width * bpp + 3) & ~3;
tmp_data = g_malloc (rowstride * height);
tmp_bmp = _cogl_bitmap_new_from_data (tmp_data,
read_format,
width, height, rowstride,
(CoglBitmapDestroyNotify) g_free,
NULL);
rowstride = cogl_bitmap_get_rowstride (tmp_bmp);
ctx->texture_driver->prep_gl_for_pixels_download (rowstride, bpp);
tmp_data = _cogl_bitmap_bind (tmp_bmp,
COGL_BUFFER_ACCESS_WRITE,
COGL_BUFFER_MAP_HINT_DISCARD);
GE( ctx, glReadPixels (x, y, width, height,
gl_format, gl_type,
tmp_data) );
_cogl_bitmap_unbind (tmp_bmp);
succeeded = _cogl_bitmap_convert_into_bitmap (tmp_bmp, bitmap);
cogl_object_unref (tmp_bmp);