mirror of
https://github.com/brl/mutter.git
synced 2024-12-23 19:42:05 +00:00
bitmap: Add a function to convert into an existing buffer
This adds _cogl_bitmap_convert_into_bitmap which is the same as _cogl_bitmap_convert except that it writes into an existing bitmap instead of allocating a new one. _cogl_bitmap_convert now just allocates a buffer and calls the new function. This is used in _cogl_read_pixels to avoid allocating a second intermediate buffer when the pixel format to store in is not GL_RGBA. Reviewed-by: Robert Bragg <robert@linux.intel.com>
This commit is contained in:
Neil Roberts
parent
f4cd5aceb9
commit
031dd661c0
@ -342,29 +342,34 @@ _cogl_bitmap_needs_short_temp_buffer (CoglPixelFormat format)
|
||||
g_assert_not_reached ();
|
||||
}
|
||||
|
||||
CoglBitmap *
|
||||
_cogl_bitmap_convert (CoglBitmap *src_bmp,
|
||||
CoglPixelFormat dst_format)
|
||||
gboolean
|
||||
_cogl_bitmap_convert_into_bitmap (CoglBitmap *src_bmp,
|
||||
CoglBitmap *dst_bmp)
|
||||
{
|
||||
guint8 *src_data;
|
||||
guint8 *dst_data;
|
||||
guint8 *src;
|
||||
guint8 *dst;
|
||||
void *tmp_row;
|
||||
int dst_bpp;
|
||||
int src_rowstride;
|
||||
int dst_rowstride;
|
||||
int y;
|
||||
int width, height;
|
||||
CoglPixelFormat src_format;
|
||||
CoglPixelFormat dst_format;
|
||||
gboolean use_16;
|
||||
gboolean need_premult;
|
||||
|
||||
src_format = _cogl_bitmap_get_format (src_bmp);
|
||||
src_rowstride = _cogl_bitmap_get_rowstride (src_bmp);
|
||||
dst_format = _cogl_bitmap_get_format (dst_bmp);
|
||||
dst_rowstride = _cogl_bitmap_get_rowstride (dst_bmp);
|
||||
width = _cogl_bitmap_get_width (src_bmp);
|
||||
height = _cogl_bitmap_get_height (src_bmp);
|
||||
|
||||
_COGL_RETURN_VAL_IF_FAIL (width == _cogl_bitmap_get_width (dst_bmp), FALSE);
|
||||
_COGL_RETURN_VAL_IF_FAIL (height == _cogl_bitmap_get_height (dst_bmp), FALSE);
|
||||
|
||||
need_premult
|
||||
= ((src_format & COGL_PREMULT_BIT) != (dst_format & COGL_PREMULT_BIT) &&
|
||||
src_format != COGL_PIXEL_FORMAT_A_8 &&
|
||||
@ -376,32 +381,44 @@ _cogl_bitmap_convert (CoglBitmap *src_bmp,
|
||||
if ((src_format & ~COGL_PREMULT_BIT) == (dst_format & ~COGL_PREMULT_BIT) &&
|
||||
(!need_premult || _cogl_bitmap_can_premult (dst_format)))
|
||||
{
|
||||
CoglBitmap *dst_bmp = _cogl_bitmap_copy (src_bmp);
|
||||
if (!_cogl_bitmap_copy_subregion (src_bmp, dst_bmp,
|
||||
0, 0, /* src_x / src_y */
|
||||
0, 0, /* dst_x / dst_y */
|
||||
width, height))
|
||||
return FALSE;
|
||||
|
||||
if (need_premult &&
|
||||
!_cogl_bitmap_convert_premult_status (dst_bmp, dst_format))
|
||||
if (need_premult)
|
||||
{
|
||||
cogl_object_unref (dst_bmp);
|
||||
return NULL;
|
||||
if ((dst_format & COGL_PREMULT_BIT))
|
||||
{
|
||||
if (!_cogl_bitmap_premult (dst_bmp))
|
||||
return FALSE;
|
||||
}
|
||||
else
|
||||
{
|
||||
if (!_cogl_bitmap_unpremult (dst_bmp))
|
||||
return FALSE;
|
||||
}
|
||||
}
|
||||
|
||||
return dst_bmp;
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
src_data = _cogl_bitmap_map (src_bmp, COGL_BUFFER_ACCESS_READ, 0);
|
||||
if (src_data == NULL)
|
||||
return NULL;
|
||||
return FALSE;
|
||||
dst_data = _cogl_bitmap_map (dst_bmp,
|
||||
COGL_BUFFER_ACCESS_WRITE,
|
||||
COGL_BUFFER_MAP_HINT_DISCARD);
|
||||
if (dst_data == NULL)
|
||||
{
|
||||
_cogl_bitmap_unmap (src_bmp);
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
use_16 = _cogl_bitmap_needs_short_temp_buffer (dst_format);
|
||||
|
||||
dst_bpp = _cogl_pixel_format_get_bytes_per_pixel (dst_format);
|
||||
|
||||
/* Initialize destination bitmap */
|
||||
dst_rowstride = (sizeof(guint8) * dst_bpp * width + 3) & ~3;
|
||||
|
||||
/* Allocate a new buffer to hold converted data */
|
||||
dst_data = g_malloc (height * dst_rowstride);
|
||||
/* and a buffer to hold a temporary RGBA row */
|
||||
/* Allocate a buffer to hold a temporary RGBA row */
|
||||
tmp_row = g_malloc (width *
|
||||
(use_16 ? sizeof (guint16) : sizeof (guint8)) * 4);
|
||||
|
||||
@ -442,14 +459,45 @@ _cogl_bitmap_convert (CoglBitmap *src_bmp,
|
||||
}
|
||||
|
||||
_cogl_bitmap_unmap (src_bmp);
|
||||
_cogl_bitmap_unmap (dst_bmp);
|
||||
|
||||
g_free (tmp_row);
|
||||
|
||||
return _cogl_bitmap_new_from_data (dst_data,
|
||||
dst_format,
|
||||
width, height, dst_rowstride,
|
||||
(CoglBitmapDestroyNotify) g_free,
|
||||
NULL);
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
CoglBitmap *
|
||||
_cogl_bitmap_convert (CoglBitmap *src_bmp,
|
||||
CoglPixelFormat dst_format)
|
||||
{
|
||||
int dst_bpp;
|
||||
int dst_rowstride;
|
||||
guint8 *dst_data;
|
||||
CoglBitmap *dst_bmp;
|
||||
int width, height;
|
||||
|
||||
width = _cogl_bitmap_get_width (src_bmp);
|
||||
height = _cogl_bitmap_get_height (src_bmp);
|
||||
dst_bpp = _cogl_pixel_format_get_bytes_per_pixel (dst_format);
|
||||
dst_rowstride = (sizeof (guint8) * dst_bpp * width + 3) & ~3;
|
||||
|
||||
/* Allocate a new buffer to hold converted data */
|
||||
dst_data = g_malloc (height * dst_rowstride);
|
||||
|
||||
dst_bmp = _cogl_bitmap_new_from_data (dst_data,
|
||||
dst_format,
|
||||
width, height,
|
||||
dst_rowstride,
|
||||
(CoglBitmapDestroyNotify) g_free,
|
||||
NULL);
|
||||
|
||||
if (!_cogl_bitmap_convert_into_bitmap (src_bmp, dst_bmp))
|
||||
{
|
||||
cogl_object_unref (dst_bmp);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return dst_bmp;
|
||||
}
|
||||
|
||||
gboolean
|
||||
|
||||
@ -87,6 +87,10 @@ CoglBitmap *
|
||||
_cogl_bitmap_convert (CoglBitmap *bmp,
|
||||
CoglPixelFormat dst_format);
|
||||
|
||||
gboolean
|
||||
_cogl_bitmap_convert_into_bitmap (CoglBitmap *src_bmp,
|
||||
CoglBitmap *dst_bmp);
|
||||
|
||||
CoglBitmap *
|
||||
_cogl_bitmap_from_file (const char *filename,
|
||||
GError **error);
|
||||
@ -101,7 +105,7 @@ gboolean
|
||||
_cogl_bitmap_convert_premult_status (CoglBitmap *bmp,
|
||||
CoglPixelFormat dst_format);
|
||||
|
||||
void
|
||||
gboolean
|
||||
_cogl_bitmap_copy_subregion (CoglBitmap *src,
|
||||
CoglBitmap *dst,
|
||||
int src_x,
|
||||
|
||||
@ -128,7 +128,7 @@ _cogl_bitmap_copy (CoglBitmap *src_bmp)
|
||||
return dst_bmp;
|
||||
}
|
||||
|
||||
void
|
||||
gboolean
|
||||
_cogl_bitmap_copy_subregion (CoglBitmap *src,
|
||||
CoglBitmap *dst,
|
||||
int src_x,
|
||||
@ -142,9 +142,12 @@ _cogl_bitmap_copy_subregion (CoglBitmap *src,
|
||||
guint8 *dstdata;
|
||||
int bpp;
|
||||
int line;
|
||||
gboolean succeeded = FALSE;
|
||||
|
||||
/* Intended only for fast copies when format is equal! */
|
||||
g_assert (src->format == dst->format);
|
||||
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)))
|
||||
@ -161,11 +164,15 @@ _cogl_bitmap_copy_subregion (CoglBitmap *src,
|
||||
dstdata += dst->rowstride;
|
||||
}
|
||||
|
||||
succeeded = TRUE;
|
||||
|
||||
_cogl_bitmap_unmap (dst);
|
||||
}
|
||||
|
||||
_cogl_bitmap_unmap (src);
|
||||
}
|
||||
|
||||
return succeeded;
|
||||
}
|
||||
|
||||
gboolean
|
||||
|
||||
16
cogl/cogl.c
16
cogl/cogl.c
@ -484,7 +484,7 @@ _cogl_read_pixels_with_rowstride (int x,
|
||||
(gl_format != GL_RGBA || gl_type != GL_UNSIGNED_BYTE ||
|
||||
rowstride != 4 * width))
|
||||
{
|
||||
CoglBitmap *tmp_bmp, *dst_bmp;
|
||||
CoglBitmap *tmp_bmp;
|
||||
guint8 *tmp_data = g_malloc (width * height * 4);
|
||||
|
||||
tmp_bmp = _cogl_bitmap_new_from_data (tmp_data,
|
||||
@ -500,19 +500,7 @@ _cogl_read_pixels_with_rowstride (int x,
|
||||
GL_RGBA, GL_UNSIGNED_BYTE,
|
||||
tmp_data) );
|
||||
|
||||
/* CoglBitmap doesn't currently have a way to convert without
|
||||
allocating its own buffer so we have to copy the data
|
||||
again */
|
||||
if ((dst_bmp = _cogl_bitmap_convert (tmp_bmp, format)))
|
||||
{
|
||||
_cogl_bitmap_copy_subregion (dst_bmp,
|
||||
bmp,
|
||||
0, 0,
|
||||
0, 0,
|
||||
width, height);
|
||||
cogl_object_unref (dst_bmp);
|
||||
}
|
||||
else
|
||||
if (!_cogl_bitmap_convert_into_bitmap (tmp_bmp, bmp))
|
||||
{
|
||||
/* FIXME: there's no way to report an error here so we'll
|
||||
just have to leave the data initialised */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user