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framebuffer: split out GL read_pixels code

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This moves the direct use of GL in cogl-framebuffer.c for handling
cogl_framebuffer_read_pixels_into_bitmap() into
driver/gl/cogl-framebuffer-gl.c and adds a
->framebuffer_read_pixels_into_bitmap vfunc to CoglDriverVtable.

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

(cherry picked from commit 2f893054d6754e6bc7983f061b27c7858f1a593c)
This commit is contained in:
Robert Bragg 2012-11-20 20:05:05 +00:00
parent 36c85da3b8
commit a57195d16d
9 changed files with 414 additions and 363 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
cogl/cogl-driver.h
View File

@ -108,6 +108,14 @@ struct _CoglDriverVtable
int n_attributes,
CoglDrawFlags flags);
CoglBool
(* framebuffer_read_pixels_into_bitmap) (CoglFramebuffer *framebuffer,
int x,
int y,
CoglReadPixelsFlags source,
CoglBitmap *bitmap,
CoglError **error);
/* Destroys any driver specific resources associated with the given
* 2D texture. */
void

370
cogl/cogl-framebuffer.c
View File

@ -30,7 +30,6 @@
#include "cogl-debug.h"
#include "cogl-context-private.h"
#include "cogl-util-gl-private.h"
#include "cogl-display-private.h"
#include "cogl-renderer-private.h"
#include "cogl-object-private.h"
@ -1362,99 +1361,6 @@ _cogl_framebuffer_try_fast_read_pixel (CoglFramebuffer *framebuffer,
return FALSE;
}
static CoglBool
_cogl_framebuffer_slow_read_pixels_workaround (CoglFramebuffer *framebuffer,
int x,
int y,
CoglReadPixelsFlags source,
CoglBitmap *bitmap,
CoglError **error)
{
CoglContext *ctx;
CoglPixelFormat format;
CoglBitmap *pbo;
int width;
int height;
CoglBool res;
uint8_t *dst;
const uint8_t *src;
_COGL_RETURN_VAL_IF_FAIL (source & COGL_READ_PIXELS_COLOR_BUFFER, FALSE);
_COGL_RETURN_VAL_IF_FAIL (cogl_is_framebuffer (framebuffer), FALSE);
ctx = cogl_framebuffer_get_context (framebuffer);
width = cogl_bitmap_get_width (bitmap);
height = cogl_bitmap_get_height (bitmap);
format = cogl_bitmap_get_format (bitmap);
pbo = cogl_bitmap_new_with_size (ctx, width, height, format);
/* Read into the pbo. We need to disable the flipping because the
blit fast path in the driver does not work with
GL_PACK_INVERT_MESA is set */
res = _cogl_framebuffer_read_pixels_into_bitmap (framebuffer,
x, y,
source |
COGL_READ_PIXELS_NO_FLIP,
pbo,
error);
if (!res)
{
cogl_object_unref (pbo);
return FALSE;
}
/* Copy the pixels back into application's buffer */
dst = _cogl_bitmap_map (bitmap,
COGL_BUFFER_ACCESS_WRITE,
COGL_BUFFER_MAP_HINT_DISCARD,
error);
if (!dst)
{
cogl_object_unref (pbo);
return FALSE;
}
src = _cogl_bitmap_map (pbo,
COGL_BUFFER_ACCESS_READ,
0, /* hints */
error);
if (src)
{
int src_rowstride = cogl_bitmap_get_rowstride (pbo);
int dst_rowstride = cogl_bitmap_get_rowstride (bitmap);
int to_copy =
_cogl_pixel_format_get_bytes_per_pixel (format) * width;
int y;
/* If the framebuffer is onscreen we need to flip the
data while copying */
if (!cogl_is_offscreen (framebuffer))
{
src += src_rowstride * (height - 1);
src_rowstride = -src_rowstride;
}
for (y = 0; y < height; y++)
{
memcpy (dst, src, to_copy);
dst += dst_rowstride;
src += src_rowstride;
}
_cogl_bitmap_unmap (pbo);
}
else
res = FALSE;
_cogl_bitmap_unmap (bitmap);
cogl_object_unref (pbo);
return res;
}
CoglBool
_cogl_framebuffer_read_pixels_into_bitmap (CoglFramebuffer *framebuffer,
int x,
@ -1464,17 +1370,8 @@ _cogl_framebuffer_read_pixels_into_bitmap (CoglFramebuffer *framebuffer,
CoglError **error)
{
CoglContext *ctx;
int framebuffer_height;
CoglPixelFormat format;
CoglPixelFormat required_format;
GLenum gl_intformat;
GLenum gl_format;
GLenum gl_type;
CoglBool pack_invert_set;
int width;
int height;
int status = FALSE;
CoglError *ignore_error = NULL;
_COGL_RETURN_VAL_IF_FAIL (source & COGL_READ_PIXELS_COLOR_BUFFER, FALSE);
_COGL_RETURN_VAL_IF_FAIL (cogl_is_framebuffer (framebuffer), FALSE);
@ -1482,11 +1379,8 @@ _cogl_framebuffer_read_pixels_into_bitmap (CoglFramebuffer *framebuffer,
if (!cogl_framebuffer_allocate (framebuffer, error))
return FALSE;
ctx = cogl_framebuffer_get_context (framebuffer);
width = cogl_bitmap_get_width (bitmap);
height = cogl_bitmap_get_height (bitmap);
format = cogl_bitmap_get_format (bitmap);
if (width == 1 && height == 1 && !framebuffer->clear_clip_dirty)
{
@ -1503,268 +1397,18 @@ _cogl_framebuffer_read_pixels_into_bitmap (CoglFramebuffer *framebuffer,
return TRUE;
}
/* Workaround for cases where its faster to read into a temporary
* PBO. This is only worth doing if:
*
* • The GPU is an Intel GPU. In that case there is a known
* fast-path when reading into a PBO that will use the blitter
* instead of the Mesa fallback code. The driver bug will only be
* set if this is the case.
* • We're not already reading into a PBO.
* • The target format is BGRA. The fast-path blit does not get hit
* otherwise.
* • The size of the data is not trivially small. This isn't a
* requirement to hit the fast-path blit but intuitively it feels
* like if the amount of data is too small then the cost of
* allocating a PBO will outweigh the cost of temporarily
* converting the data to floats.
*/
if ((ctx->gpu.driver_bugs &
COGL_GPU_INFO_DRIVER_BUG_MESA_46631_SLOW_READ_PIXELS) &&
(width > 8 || height > 8) &&
(format & ~COGL_PREMULT_BIT) == COGL_PIXEL_FORMAT_BGRA_8888 &&
cogl_bitmap_get_buffer (bitmap) == NULL)
{
ctx = cogl_framebuffer_get_context (framebuffer);
if (_cogl_framebuffer_slow_read_pixels_workaround (framebuffer,
x, y,
source,
bitmap,
&ignore_error))
return TRUE;
else
cogl_error_free (ignore_error);
}
/* make sure any batched primitives get emitted to the GL driver
/* make sure any batched primitives get emitted to the driver
* before issuing our read pixels...
*/
_cogl_framebuffer_flush_journal (framebuffer);
_cogl_framebuffer_flush_state (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;
required_format = ctx->driver_vtable->pixel_format_to_gl (ctx,
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) &&
(source & COGL_READ_PIXELS_NO_FLIP) == 0 &&
!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->private_feature_flags &
COGL_PRIVATE_FEATURE_READ_PIXELS_ANY_FORMAT) &&
(gl_format != GL_RGBA || gl_type != GL_UNSIGNED_BYTE ||
cogl_bitmap_get_rowstride (bitmap) != 4 * width)) ||
(required_format & ~COGL_PREMULT_BIT) != (format & ~COGL_PREMULT_BIT))
{
CoglBitmap *tmp_bmp;
CoglPixelFormat read_format;
int bpp, rowstride;
uint8_t *tmp_data;
CoglBool succeeded;
if ((ctx->private_feature_flags &
COGL_PRIVATE_FEATURE_READ_PIXELS_ANY_FORMAT))
read_format = required_format;
else
{
read_format = COGL_PIXEL_FORMAT_RGBA_8888;
gl_format = GL_RGBA;
gl_type = GL_UNSIGNED_BYTE;
}
if (COGL_PIXEL_FORMAT_CAN_HAVE_PREMULT (read_format))
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,
error);
if (!tmp_bmp)
goto EXIT;
bpp = _cogl_pixel_format_get_bytes_per_pixel (read_format);
rowstride = cogl_bitmap_get_rowstride (tmp_bmp);
ctx->texture_driver->prep_gl_for_pixels_download (ctx,
rowstride,
width,
bpp);
/* Note: we don't worry about catching errors here since we know
* we won't be lazily allocating storage for this buffer so it
* won't fail due to lack of memory. */
tmp_data = _cogl_bitmap_gl_bind (tmp_bmp,
COGL_BUFFER_ACCESS_WRITE,
COGL_BUFFER_MAP_HINT_DISCARD,
NULL);
GE( ctx, glReadPixels (x, y, width, height,
gl_format, gl_type,
tmp_data) );
_cogl_bitmap_gl_unbind (tmp_bmp);
succeeded = _cogl_bitmap_convert_into_bitmap (tmp_bmp, bitmap, error);
cogl_object_unref (tmp_bmp);
if (!succeeded)
goto EXIT;
}
else
{
CoglBitmap *shared_bmp;
CoglPixelFormat bmp_format;
int bpp, rowstride;
CoglBool succeeded = FALSE;
uint8_t *pixels;
CoglError *internal_error = NULL;
rowstride = cogl_bitmap_get_rowstride (bitmap);
/* 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 (COGL_PIXEL_FORMAT_CAN_HAVE_PREMULT (format))
bmp_format = ((format & ~COGL_PREMULT_BIT) |
(framebuffer->format & COGL_PREMULT_BIT));
else
bmp_format = format;
if (bmp_format != format)
shared_bmp = _cogl_bitmap_new_shared (bitmap,
bmp_format,
width, height,
rowstride);
else
shared_bmp = cogl_object_ref (bitmap);
bpp = _cogl_pixel_format_get_bytes_per_pixel (bmp_format);
ctx->texture_driver->prep_gl_for_pixels_download (ctx,
rowstride,
width,
bpp);
pixels = _cogl_bitmap_gl_bind (shared_bmp,
COGL_BUFFER_ACCESS_WRITE,
0, /* hints */
&internal_error);
/* NB: _cogl_bitmap_gl_bind() can return NULL in sucessfull
* cases so we have to explicitly check the cogl error pointer
* to know if there was a problem */
if (internal_error)
{
cogl_object_unref (shared_bmp);
_cogl_propagate_error (error, internal_error);
goto EXIT;
}
GE( ctx, glReadPixels (x, y,
width, height,
gl_format, gl_type,
pixels) );
_cogl_bitmap_gl_unbind (shared_bmp);
/* Convert to the premult format specified by the caller
in-place. This will do nothing if the premult status is already
correct. */
if (_cogl_bitmap_convert_premult_status (shared_bmp, format, error))
succeeded = TRUE;
cogl_object_unref (shared_bmp);
if (!succeeded)
goto EXIT;
}
/* NB: All offscreen rendering is done upside down so there is no need
* to flip in this case... */
if (!cogl_is_offscreen (framebuffer) &&
(source & COGL_READ_PIXELS_NO_FLIP) == 0 &&
!pack_invert_set)
{
uint8_t *temprow;
int rowstride;
uint8_t *pixels;
rowstride = cogl_bitmap_get_rowstride (bitmap);
pixels = _cogl_bitmap_map (bitmap,
COGL_BUFFER_ACCESS_READ |
COGL_BUFFER_ACCESS_WRITE,
0, /* hints */
error);
if (pixels == NULL)
goto EXIT;
temprow = g_alloca (rowstride * sizeof (uint8_t));
/* 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_bitmap_unmap (bitmap);
}
status = TRUE;
EXIT:
/* 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));
return status;
return ctx->driver_vtable->framebuffer_read_pixels_into_bitmap (framebuffer,
x, y,
source,
bitmap,
error);
}
CoglBool

8
cogl/driver/gl/cogl-framebuffer-gl-private.h
View File

@ -86,6 +86,14 @@ _cogl_framebuffer_gl_draw_indexed_attributes (CoglFramebuffer *framebuffer,
int n_attributes,
CoglDrawFlags flags);
CoglBool
_cogl_framebuffer_gl_read_pixels_into_bitmap (CoglFramebuffer *framebuffer,
int x,
int y,
CoglReadPixelsFlags source,
CoglBitmap *bitmap,
CoglError **error);
#endif /* __COGL_FRAMEBUFFER_GL_PRIVATE_H__ */

369
cogl/driver/gl/cogl-framebuffer-gl.c
View File

@ -35,6 +35,7 @@
#include "cogl-texture-gl-private.h"
#include <glib.h>
#include <string.h>
#ifndef GL_FRAMEBUFFER
#define GL_FRAMEBUFFER 0x8D40
@ -1101,3 +1102,371 @@ _cogl_framebuffer_gl_draw_indexed_attributes (CoglFramebuffer *framebuffer,
_cogl_buffer_gl_unbind (buffer);
}
static CoglBool
mesa_46631_slow_read_pixels_workaround (CoglFramebuffer *framebuffer,
int x,
int y,
CoglReadPixelsFlags source,
CoglBitmap *bitmap,
CoglError **error)
{
CoglContext *ctx;
CoglPixelFormat format;
CoglBitmap *pbo;
int width;
int height;
CoglBool res;
uint8_t *dst;
const uint8_t *src;
ctx = cogl_framebuffer_get_context (framebuffer);
width = cogl_bitmap_get_width (bitmap);
height = cogl_bitmap_get_height (bitmap);
format = cogl_bitmap_get_format (bitmap);
pbo = cogl_bitmap_new_with_size (ctx, width, height, format);
/* Read into the pbo. We need to disable the flipping because the
blit fast path in the driver does not work with
GL_PACK_INVERT_MESA is set */
res = _cogl_framebuffer_read_pixels_into_bitmap (framebuffer,
x, y,
source |
COGL_READ_PIXELS_NO_FLIP,
pbo,
error);
if (!res)
{
cogl_object_unref (pbo);
return FALSE;
}
/* Copy the pixels back into application's buffer */
dst = _cogl_bitmap_map (bitmap,
COGL_BUFFER_ACCESS_WRITE,
COGL_BUFFER_MAP_HINT_DISCARD,
error);
if (!dst)
{
cogl_object_unref (pbo);
return FALSE;
}
src = _cogl_bitmap_map (pbo,
COGL_BUFFER_ACCESS_READ,
0, /* hints */
error);
if (src)
{
int src_rowstride = cogl_bitmap_get_rowstride (pbo);
int dst_rowstride = cogl_bitmap_get_rowstride (bitmap);
int to_copy =
_cogl_pixel_format_get_bytes_per_pixel (format) * width;
int y;
/* If the framebuffer is onscreen we need to flip the
data while copying */
if (!cogl_is_offscreen (framebuffer))
{
src += src_rowstride * (height - 1);
src_rowstride = -src_rowstride;
}
for (y = 0; y < height; y++)
{
memcpy (dst, src, to_copy);
dst += dst_rowstride;
src += src_rowstride;
}
_cogl_bitmap_unmap (pbo);
}
else
res = FALSE;
_cogl_bitmap_unmap (bitmap);
cogl_object_unref (pbo);
return res;
}
CoglBool
_cogl_framebuffer_gl_read_pixels_into_bitmap (CoglFramebuffer *framebuffer,
int x,
int y,
CoglReadPixelsFlags source,
CoglBitmap *bitmap,
CoglError **error)
{
CoglContext *ctx = framebuffer->context;
int framebuffer_height = cogl_framebuffer_get_height (framebuffer);
int width = cogl_bitmap_get_width (bitmap);
int height = cogl_bitmap_get_height (bitmap);
CoglPixelFormat format = cogl_bitmap_get_format (bitmap);
CoglPixelFormat required_format;
GLenum gl_intformat;
GLenum gl_format;
GLenum gl_type;
CoglBool pack_invert_set;
int status = FALSE;
/* Workaround for cases where its faster to read into a temporary
* PBO. This is only worth doing if:
*
* • The GPU is an Intel GPU. In that case there is a known
* fast-path when reading into a PBO that will use the blitter
* instead of the Mesa fallback code. The driver bug will only be
* set if this is the case.
* • We're not already reading into a PBO.
* • The target format is BGRA. The fast-path blit does not get hit
* otherwise.
* • The size of the data is not trivially small. This isn't a
* requirement to hit the fast-path blit but intuitively it feels
* like if the amount of data is too small then the cost of
* allocating a PBO will outweigh the cost of temporarily
* converting the data to floats.
*/
if ((ctx->gpu.driver_bugs &
COGL_GPU_INFO_DRIVER_BUG_MESA_46631_SLOW_READ_PIXELS) &&
(width > 8 || height > 8) &&
(format & ~COGL_PREMULT_BIT) == COGL_PIXEL_FORMAT_BGRA_8888 &&
cogl_bitmap_get_buffer (bitmap) == NULL)
{
CoglError *ignore_error = NULL;
if (mesa_46631_slow_read_pixels_workaround (framebuffer,
x, y,
source,
bitmap,
&ignore_error))
return TRUE;
else
cogl_error_free (ignore_error);
}
_cogl_framebuffer_flush_state (framebuffer,
framebuffer,
COGL_FRAMEBUFFER_STATE_BIND);
/* 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;
required_format = ctx->driver_vtable->pixel_format_to_gl (ctx,
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) &&
(source & COGL_READ_PIXELS_NO_FLIP) == 0 &&
!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->private_feature_flags &
COGL_PRIVATE_FEATURE_READ_PIXELS_ANY_FORMAT) &&
(gl_format != GL_RGBA || gl_type != GL_UNSIGNED_BYTE ||
cogl_bitmap_get_rowstride (bitmap) != 4 * width)) ||
(required_format & ~COGL_PREMULT_BIT) != (format & ~COGL_PREMULT_BIT))
{
CoglBitmap *tmp_bmp;
CoglPixelFormat read_format;
int bpp, rowstride;
uint8_t *tmp_data;
CoglBool succeeded;
if ((ctx->private_feature_flags &
COGL_PRIVATE_FEATURE_READ_PIXELS_ANY_FORMAT))
read_format = required_format;
else
{
read_format = COGL_PIXEL_FORMAT_RGBA_8888;
gl_format = GL_RGBA;
gl_type = GL_UNSIGNED_BYTE;
}
if (COGL_PIXEL_FORMAT_CAN_HAVE_PREMULT (read_format))
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,
error);
if (!tmp_bmp)
goto EXIT;
bpp = _cogl_pixel_format_get_bytes_per_pixel (read_format);
rowstride = cogl_bitmap_get_rowstride (tmp_bmp);
ctx->texture_driver->prep_gl_for_pixels_download (ctx,
rowstride,
width,
bpp);
/* Note: we don't worry about catching errors here since we know
* we won't be lazily allocating storage for this buffer so it
* won't fail due to lack of memory. */
tmp_data = _cogl_bitmap_gl_bind (tmp_bmp,
COGL_BUFFER_ACCESS_WRITE,
COGL_BUFFER_MAP_HINT_DISCARD,
NULL);
GE( ctx, glReadPixels (x, y, width, height,
gl_format, gl_type,
tmp_data) );
_cogl_bitmap_gl_unbind (tmp_bmp);
succeeded = _cogl_bitmap_convert_into_bitmap (tmp_bmp, bitmap, error);
cogl_object_unref (tmp_bmp);
if (!succeeded)
goto EXIT;
}
else
{
CoglBitmap *shared_bmp;
CoglPixelFormat bmp_format;
int bpp, rowstride;
CoglBool succeeded = FALSE;
uint8_t *pixels;
CoglError *internal_error = NULL;
rowstride = cogl_bitmap_get_rowstride (bitmap);
/* 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 (COGL_PIXEL_FORMAT_CAN_HAVE_PREMULT (format))
bmp_format = ((format & ~COGL_PREMULT_BIT) |
(framebuffer->format & COGL_PREMULT_BIT));
else
bmp_format = format;
if (bmp_format != format)
shared_bmp = _cogl_bitmap_new_shared (bitmap,
bmp_format,
width, height,
rowstride);
else
shared_bmp = cogl_object_ref (bitmap);
bpp = _cogl_pixel_format_get_bytes_per_pixel (bmp_format);
ctx->texture_driver->prep_gl_for_pixels_download (ctx,
rowstride,
width,
bpp);
pixels = _cogl_bitmap_gl_bind (shared_bmp,
COGL_BUFFER_ACCESS_WRITE,
0, /* hints */
&internal_error);
/* NB: _cogl_bitmap_gl_bind() can return NULL in sucessfull
* cases so we have to explicitly check the cogl error pointer
* to know if there was a problem */
if (internal_error)
{
cogl_object_unref (shared_bmp);
_cogl_propagate_error (error, internal_error);
goto EXIT;
}
GE( ctx, glReadPixels (x, y,
width, height,
gl_format, gl_type,
pixels) );
_cogl_bitmap_gl_unbind (shared_bmp);
/* Convert to the premult format specified by the caller
in-place. This will do nothing if the premult status is already
correct. */
if (_cogl_bitmap_convert_premult_status (shared_bmp, format, error))
succeeded = TRUE;
cogl_object_unref (shared_bmp);
if (!succeeded)
goto EXIT;
}
/* NB: All offscreen rendering is done upside down so there is no need
* to flip in this case... */
if (!cogl_is_offscreen (framebuffer) &&
(source & COGL_READ_PIXELS_NO_FLIP) == 0 &&
!pack_invert_set)
{
uint8_t *temprow;
int rowstride;
uint8_t *pixels;
rowstride = cogl_bitmap_get_rowstride (bitmap);
pixels = _cogl_bitmap_map (bitmap,
COGL_BUFFER_ACCESS_READ |
COGL_BUFFER_ACCESS_WRITE,
0, /* hints */
error);
if (pixels == NULL)
goto EXIT;
temprow = g_alloca (rowstride * sizeof (uint8_t));
/* 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_bitmap_unmap (bitmap);
}
status = TRUE;
EXIT:
/* 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));
return status;
}

1
cogl/driver/gl/gl/cogl-driver-gl.c
View File

@ -634,6 +634,7 @@ _cogl_driver_gl =
_cogl_framebuffer_gl_discard_buffers,
_cogl_framebuffer_gl_draw_attributes,
_cogl_framebuffer_gl_draw_indexed_attributes,
_cogl_framebuffer_gl_read_pixels_into_bitmap,
_cogl_texture_2d_gl_free,
_cogl_texture_2d_gl_can_create,
_cogl_texture_2d_gl_init,

1
cogl/driver/gl/gles/cogl-driver-gles.c
View File

@ -376,6 +376,7 @@ _cogl_driver_gles =
_cogl_framebuffer_gl_discard_buffers,
_cogl_framebuffer_gl_draw_attributes,
_cogl_framebuffer_gl_draw_indexed_attributes,
_cogl_framebuffer_gl_read_pixels_into_bitmap,
_cogl_texture_2d_gl_free,
_cogl_texture_2d_gl_can_create,
_cogl_texture_2d_gl_init,

1
cogl/driver/nop/cogl-driver-nop.c
View File

@ -64,6 +64,7 @@ _cogl_driver_nop =
_cogl_framebuffer_nop_discard_buffers,
_cogl_framebuffer_nop_draw_attributes,
_cogl_framebuffer_nop_draw_indexed_attributes,
_cogl_framebuffer_nop_read_pixels_into_bitmap,
_cogl_texture_2d_nop_free,
_cogl_texture_2d_nop_can_create,
_cogl_texture_2d_nop_init,

8
cogl/driver/nop/cogl-framebuffer-nop-private.h
View File

@ -86,4 +86,12 @@ _cogl_framebuffer_nop_draw_indexed_attributes (CoglFramebuffer *framebuffer,
int n_attributes,
CoglDrawFlags flags);
CoglBool
_cogl_framebuffer_nop_read_pixels_into_bitmap (CoglFramebuffer *framebuffer,
int x,
int y,
CoglReadPixelsFlags source,
CoglBitmap *bitmap,
CoglError **error);
#endif /* _COGL_FRAMEBUFFER_NOP_PRIVATE_H_ */

11
cogl/driver/nop/cogl-framebuffer-nop.c
View File

@ -108,3 +108,14 @@ _cogl_framebuffer_nop_draw_indexed_attributes (CoglFramebuffer *framebuffer,
CoglDrawFlags flags)
{
}
CoglBool
_cogl_framebuffer_nop_read_pixels_into_bitmap (CoglFramebuffer *framebuffer,
int x,
int y,
CoglReadPixelsFlags source,
CoglBitmap *bitmap,
CoglError **error)
{
return TRUE;
}