CoglBitmap *
_cogl_texture_prepare_for_upload (CoglBitmap *src_bmp,
CoglPixelFormat dst_format,
CoglPixelFormat *dst_format_out,
GLenum *out_glintformat,
GLenum *out_glformat,
GLenum *out_gltype)
{
CoglPixelFormat src_format = _cogl_bitmap_get_format (src_bmp);
CoglBitmap *dst_bmp;
dst_format = _cogl_texture_determine_internal_format (src_format,
dst_format);
/* OpenGL supports specifying a different format for the internal
format when uploading texture data. We should use this to convert
formats because it is likely to be faster and support more types
than the Cogl bitmap code. However under GLES the internal format
must be the same as the bitmap format and it only supports a
limited number of formats so we must convert using the Cogl
bitmap code instead */
#ifdef HAVE_COGL_GL
/* If the source format does not have the same premult flag as the
dst format then we need to copy and convert it */
if (_cogl_texture_needs_premult_conversion (src_format,
dst_format))
{
dst_bmp = _cogl_bitmap_copy (src_bmp);
if (!_cogl_bitmap_convert_premult_status (dst_bmp,
src_format ^
COGL_PREMULT_BIT))
{
cogl_object_unref (dst_bmp);
return NULL;
}
}
else
dst_bmp = cogl_object_ref (src_bmp);
/* Use the source format from the src bitmap type and the internal
format from the dst format type so that GL can do the
conversion */
_cogl_pixel_format_to_gl (src_format,
NULL, /* internal format */
out_glformat,
out_gltype);
_cogl_pixel_format_to_gl (dst_format,
out_glintformat,
NULL,
NULL);
#else /* HAVE_COGL_GL */
{
CoglPixelFormat closest_format;
closest_format = _cogl_pixel_format_to_gl (dst_format,
out_glintformat,
out_glformat,
out_gltype);
if (closest_format != src_format)
dst_bmp = _cogl_bitmap_convert_format_and_premult (src_bmp,
closest_format);
else
dst_bmp = cogl_object_ref (src_bmp);
}
#endif /* HAVE_COGL_GL */
if (dst_format_out)
*dst_format_out = dst_format;
return dst_bmp;
}
static int
_cogl_texture_2d_get_data (CoglTexture *tex,
CoglPixelFormat format,
unsigned int rowstride,
guint8 *data)
{
CoglTexture2D *tex_2d = COGL_TEXTURE_2D (tex);
int bpp;
int byte_size;
CoglPixelFormat closest_format;
int closest_bpp;
GLenum closest_gl_format;
GLenum closest_gl_type;
CoglBitmap target_bmp;
CoglBitmap new_bmp;
gboolean success;
guint8 *src;
guint8 *dst;
int y;
/* Default to internal format if none specified */
if (format == COGL_PIXEL_FORMAT_ANY)
format = tex_2d->format;
/* Rowstride from texture width if none specified */
bpp = _cogl_get_format_bpp (format);
if (rowstride == 0)
rowstride = tex_2d->width * bpp;
/* Return byte size if only that requested */
byte_size = tex_2d->height * rowstride;
if (data == NULL)
return byte_size;
closest_format =
_cogl_texture_driver_find_best_gl_get_data_format (format,
&closest_gl_format,
&closest_gl_type);
closest_bpp = _cogl_get_format_bpp (closest_format);
target_bmp.width = tex_2d->width;
target_bmp.height = tex_2d->height;
/* Is the requested format supported? */
if (closest_format == format)
{
/* Target user data directly */
target_bmp.format = format;
target_bmp.rowstride = rowstride;
target_bmp.data = data;
}
else
{
/* Target intermediate buffer */
target_bmp.format = closest_format;
target_bmp.rowstride = target_bmp.width * closest_bpp;
target_bmp.data = g_malloc (target_bmp.height * target_bmp.rowstride);
}
_cogl_texture_driver_prep_gl_for_pixels_download (target_bmp.rowstride,
closest_bpp);
GE( glBindTexture (GL_TEXTURE_2D, tex_2d->gl_texture) );
if (!_cogl_texture_driver_gl_get_tex_image (GL_TEXTURE_2D,
closest_gl_format,
closest_gl_type,
target_bmp.data))
{
/* XXX: In some cases _cogl_texture_2d_download_from_gl may
* fail to read back the texture data; such as for GLES which doesn't
* support glGetTexImage, so here we fallback to drawing the texture
* and reading the pixels from the framebuffer. */
_cogl_texture_draw_and_read (tex, &target_bmp,
closest_gl_format,
closest_gl_type);
}
/* Was intermediate used? */
if (closest_format != format)
{
/* Convert to requested format */
success = _cogl_bitmap_convert_format_and_premult (&target_bmp,
&new_bmp,
format);
/* Free intermediate data and return if failed */
g_free (target_bmp.data);
if (!success)
return 0;
/* Copy to user buffer */
for (y = 0; y < new_bmp.height; ++y)
{
src = new_bmp.data + y * new_bmp.rowstride;
dst = data + y * rowstride;
memcpy (dst, src, new_bmp.width);
}
/* Free converted data */
g_free (new_bmp.data);
}
return byte_size;
}
int
cogl_texture_get_data (CoglHandle handle,
CoglPixelFormat format,
unsigned int rowstride,
guint8 *data)
{
CoglTexture *tex;
int bpp;
int byte_size;
CoglPixelFormat closest_format;
int closest_bpp;
GLenum closest_gl_format;
GLenum closest_gl_type;
CoglBitmap *target_bmp;
CoglBitmap *new_bmp;
guint8 *src;
guint8 *dst;
int y;
int tex_width;
int tex_height;
CoglTextureGetData tg_data;
if (!cogl_is_texture (handle))
return 0;
tex = COGL_TEXTURE (handle);
/* Default to internal format if none specified */
if (format == COGL_PIXEL_FORMAT_ANY)
format = cogl_texture_get_format (handle);
tex_width = cogl_texture_get_width (handle);
tex_height = cogl_texture_get_height (handle);
/* Rowstride from texture width if none specified */
bpp = _cogl_get_format_bpp (format);
if (rowstride == 0)
rowstride = tex_width * bpp;
/* Return byte size if only that requested */
byte_size = tex_height * rowstride;
if (data == NULL)
return byte_size;
closest_format =
_cogl_texture_driver_find_best_gl_get_data_format (format,
&closest_gl_format,
&closest_gl_type);
closest_bpp = _cogl_get_format_bpp (closest_format);
/* Is the requested format supported? */
if (closest_format == format)
/* Target user data directly */
target_bmp = _cogl_bitmap_new_from_data (data,
format,
tex_width,
tex_height,
rowstride,
NULL, NULL);
else
{
int target_rowstride = tex_width * closest_bpp;
guint8 *target_data = g_malloc (tex_height * target_rowstride);
target_bmp = _cogl_bitmap_new_from_data (target_data,
closest_format,
tex_width,
tex_height,
target_rowstride,
(CoglBitmapDestroyNotify) g_free,
NULL);
}
tg_data.orig_width = tex_width;
tg_data.orig_height = tex_height;
tg_data.target_bmp = target_bmp;
tg_data.target_bits = _cogl_bitmap_map (target_bmp, COGL_BUFFER_ACCESS_WRITE,
COGL_BUFFER_MAP_HINT_DISCARD);
if (tg_data.target_bits == NULL)
{
cogl_object_unref (target_bmp);
return 0;
}
tg_data.success = TRUE;
/* Iterating through the subtextures allows piecing together
* the data for a sliced texture, and allows us to do the
* read-from-framebuffer logic here in a simple fashion rather than
* passing offsets down through the code. */
_cogl_texture_foreach_sub_texture_in_region (handle,
0, 0, 1, 1,
texture_get_cb,
&tg_data);
_cogl_bitmap_unmap (target_bmp);
/* XXX: In some cases _cogl_texture_2d_download_from_gl may fail
* to read back the texture data; such as for GLES which doesn't
* support glGetTexImage, so here we fallback to drawing the
* texture and reading the pixels from the framebuffer. */
if (!tg_data.success)
_cogl_texture_draw_and_read (tex, target_bmp,
closest_gl_format,
closest_gl_type);
/* Was intermediate used? */
if (closest_format != format)
{
guint8 *new_bmp_data;
int new_bmp_rowstride;
/* Convert to requested format */
new_bmp = _cogl_bitmap_convert_format_and_premult (target_bmp,
format);
/* Free intermediate data and return if failed */
cogl_object_unref (target_bmp);
if (new_bmp == NULL)
return 0;
new_bmp_rowstride = _cogl_bitmap_get_rowstride (new_bmp);
new_bmp_data = _cogl_bitmap_map (new_bmp, COGL_BUFFER_ACCESS_WRITE,
COGL_BUFFER_MAP_HINT_DISCARD);
if (new_bmp_data == NULL)
{
cogl_object_unref (new_bmp);
return 0;
}
/* Copy to user buffer */
for (y = 0; y < tex_height; ++y)
{
src = new_bmp_data + y * new_bmp_rowstride;
dst = data + y * rowstride;
memcpy (dst, src, tex_width * bpp);
}
_cogl_bitmap_unmap (new_bmp);
/* Free converted data */
cogl_object_unref (new_bmp);
}
return byte_size;
}
void
_cogl_read_pixels_with_rowstride (int x,
int y,
int width,
int height,
CoglReadPixelsFlags source,
CoglPixelFormat format,
guint8 *pixels,
int rowstride)
{
CoglFramebuffer *framebuffer = _cogl_get_read_framebuffer ();
int framebuffer_height;
int bpp;
CoglBitmap *bmp;
GLenum gl_intformat;
GLenum gl_format;
GLenum gl_type;
CoglPixelFormat bmp_format;
gboolean pack_invert_set;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_COGL_RETURN_IF_FAIL (source == COGL_READ_PIXELS_COLOR_BUFFER);
if (width == 1 && height == 1 && !framebuffer->clear_clip_dirty)
{
/* If everything drawn so far for this frame is still in the
* Journal then if all of the rectangles only have a flat
* opaque color we have a fast-path for reading a single pixel
* that avoids the relatively high cost of flushing primitives
* to be drawn on the GPU (considering how simple the geometry
* is in this case) and then blocking on the long GPU pipelines
* for the result.
*/
if (_cogl_framebuffer_try_fast_read_pixel (framebuffer,
x, y, source, format,
pixels))
return;
}
/* make sure any batched primitives get emitted to the GL driver
* before issuing our read pixels...
*
* XXX: Note we currently use cogl_flush to ensure *all* journals
* are flushed here and not _cogl_journal_flush because we don't
* track the dependencies between framebuffers so we don't know if
* the current framebuffer depends on the contents of other
* framebuffers which could also have associated journal entries.
*/
cogl_flush ();
_cogl_framebuffer_flush_state (cogl_get_draw_framebuffer (),
framebuffer,
COGL_FRAMEBUFFER_STATE_BIND);
framebuffer_height = cogl_framebuffer_get_height (framebuffer);
/* The y co-ordinate should be given in OpenGL's coordinate system
* so 0 is the bottom row
*
* NB: all offscreen rendering is done upside down so no conversion
* is necissary in this case.
*/
if (!cogl_is_offscreen (framebuffer))
y = framebuffer_height - y - height;
/* Initialise the CoglBitmap */
bpp = _cogl_get_format_bpp (format);
bmp_format = format;
if ((format & COGL_A_BIT))
{
/* We match the premultiplied state of the target buffer to the
* premultiplied state of the framebuffer so that it will get
* converted to the right format below */
if ((framebuffer->format & COGL_PREMULT_BIT))
bmp_format |= COGL_PREMULT_BIT;
else
bmp_format &= ~COGL_PREMULT_BIT;
}
bmp = _cogl_bitmap_new_from_data (pixels,
bmp_format, width, height, rowstride,
NULL, NULL);
ctx->texture_driver->pixel_format_to_gl (format,
&gl_intformat,
&gl_format,
&gl_type);
/* NB: All offscreen rendering is done upside down so there is no need
* to flip in this case... */
if ((ctx->private_feature_flags & COGL_PRIVATE_FEATURE_MESA_PACK_INVERT) &&
!cogl_is_offscreen (framebuffer))
{
GE (ctx, glPixelStorei (GL_PACK_INVERT_MESA, TRUE));
pack_invert_set = TRUE;
}
else
pack_invert_set = FALSE;
/* Under GLES only GL_RGBA with GL_UNSIGNED_BYTE as well as an
implementation specific format under
GL_IMPLEMENTATION_COLOR_READ_FORMAT_OES and
GL_IMPLEMENTATION_COLOR_READ_TYPE_OES is supported. We could try
to be more clever and check if the requested type matches that
but we would need some reliable functions to convert from GL
types to Cogl types. For now, lets just always read in
GL_RGBA/GL_UNSIGNED_BYTE and convert if necessary. We also need
to use this intermediate buffer if the rowstride has padding
because GLES does not support setting GL_ROW_LENGTH */
if (ctx->driver != COGL_DRIVER_GL &&
(gl_format != GL_RGBA || gl_type != GL_UNSIGNED_BYTE ||
rowstride != 4 * width))
{
CoglBitmap *tmp_bmp, *dst_bmp;
guint8 *tmp_data = g_malloc (width * height * 4);
tmp_bmp = _cogl_bitmap_new_from_data (tmp_data,
COGL_PIXEL_FORMAT_RGBA_8888 |
(bmp_format & COGL_PREMULT_BIT),
width, height, 4 * width,
(CoglBitmapDestroyNotify) g_free,
NULL);
ctx->texture_driver->prep_gl_for_pixels_download (4 * width, 4);
GE( ctx, glReadPixels (x, y, width, height,
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_format_and_premult (tmp_bmp,
format)))
{
_cogl_bitmap_copy_subregion (dst_bmp,
bmp,
0, 0,
0, 0,
width, height);
cogl_object_unref (dst_bmp);
}
else
{
/* FIXME: there's no way to report an error here so we'll
just have to leave the data initialised */
}
cogl_object_unref (tmp_bmp);
}
else
{
ctx->texture_driver->prep_gl_for_pixels_download (rowstride, bpp);
GE( ctx, glReadPixels (x, y, width, height, gl_format, gl_type, pixels) );
/* Convert to the premult format specified by the caller
in-place. This will do nothing if the premult status is already
correct. */
_cogl_bitmap_convert_premult_status (bmp, format);
}
/* Currently this function owns the pack_invert state and we don't want this
* to interfere with other Cogl components so all other code can assume that
* we leave the pack_invert state off. */
if (pack_invert_set)
GE (ctx, glPixelStorei (GL_PACK_INVERT_MESA, FALSE));
/* NB: All offscreen rendering is done upside down so there is no need
* to flip in this case... */
if (!cogl_is_offscreen (framebuffer) && !pack_invert_set)
{
guint8 *temprow = g_alloca (rowstride * sizeof (guint8));
/* vertically flip the buffer in-place */
for (y = 0; y < height / 2; y++)
{
if (y != height - y - 1) /* skip center row */
{
memcpy (temprow,
pixels + y * rowstride, rowstride);
memcpy (pixels + y * rowstride,
pixels + (height - y - 1) * rowstride, rowstride);
memcpy (pixels + (height - y - 1) * rowstride,
temprow,
rowstride);
}
}
}
cogl_object_unref (bmp);
}
