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mutter/cogl/cogl/cogl-texture.c
Carlos Garnacho 374bb630f0 cogl: Use pixel_format_to_gl_with_target in find_best_gl_get_data_format 
Fixes cogl_texture_get_data() resorting to the wrong conversions when
extracting the texture data. This notably resulted in RGB/RGBA buffers
copied as-is into BGRA buffers, for instance for the fullscreen animation,
or single-window screenshots of such buffers.

https://bugzilla.gnome.org/show_bug.cgi?id=779234
2017-05-18 23:32:39 +02:00

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/*
* Cogl
*
* A Low Level GPU Graphics and Utilities API
*
* Copyright (C) 2007,2008,2009 Intel Corporation.
* Copyright (C) 2010 Red Hat, Inc.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*
*
* Authors:
* Matthew Allum <mallum@openedhand.com>
* Neil Roberts <neil@linux.intel.com>
* Robert Bragg <robert@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "cogl-config.h"
#endif
#include "cogl-util.h"
#include "cogl-bitmap.h"
#include "cogl-bitmap-private.h"
#include "cogl-buffer-private.h"
#include "cogl-pixel-buffer-private.h"
#include "cogl-private.h"
#include "cogl-texture-private.h"
#include "cogl-texture-driver.h"
#include "cogl-texture-2d-sliced-private.h"
#include "cogl-texture-2d-private.h"
#include "cogl-texture-2d-gl.h"
#include "cogl-texture-3d-private.h"
#include "cogl-texture-rectangle-private.h"
#include "cogl-sub-texture-private.h"
#include "cogl-atlas-texture-private.h"
#include "cogl-pipeline.h"
#include "cogl-context-private.h"
#include "cogl-object-private.h"
#include "cogl-object-private.h"
#include "cogl-primitives.h"
#include "cogl-framebuffer-private.h"
#include "cogl1-context.h"
#include "cogl-sub-texture.h"
#include "cogl-primitive-texture.h"
#include "cogl-error-private.h"
#include "cogl-gtype-private.h"
#include <string.h>
#include <stdlib.h>
#include <math.h>
/* This isn't defined in the GLES headers */
#ifndef GL_RED
#define GL_RED 0x1903
#endif
COGL_GTYPE_DEFINE_INTERFACE (Texture, texture);
uint32_t
cogl_texture_error_quark (void)
{
return g_quark_from_static_string ("cogl-texture-error-quark");
}
/* XXX:
* The CoglObject macros don't support any form of inheritance, so for
* now we implement the CoglObject support for the CoglTexture
* abstract class manually.
*/
static GSList *_cogl_texture_types;
void
_cogl_texture_register_texture_type (const CoglObjectClass *klass)
{
_cogl_texture_types = g_slist_prepend (_cogl_texture_types, (void *) klass);
}
CoglBool
cogl_is_texture (void *object)
{
CoglObject *obj = (CoglObject *)object;
GSList *l;
if (object == NULL)
return FALSE;
for (l = _cogl_texture_types; l; l = l->next)
if (l->data == obj->klass)
return TRUE;
return FALSE;
}
void
_cogl_texture_init (CoglTexture *texture,
CoglContext *context,
int width,
int height,
CoglPixelFormat src_format,
CoglTextureLoader *loader,
const CoglTextureVtable *vtable)
{
texture->context = context;
texture->max_level = 0;
texture->width = width;
texture->height = height;
texture->allocated = FALSE;
texture->vtable = vtable;
texture->framebuffers = NULL;
texture->loader = loader;
_cogl_texture_set_internal_format (texture, src_format);
/* Although we want to initialize texture::components according
* to the source format, we always want the internal layout to
* be considered premultiplied by default.
*
* NB: this ->premultiplied state is user configurable so to avoid
* awkward documentation, setting this to 'true' does not depend on
* ->components having an alpha component (we will simply ignore the
* premultiplied status later if there is no alpha component).
* This way we don't have to worry about updating the
* ->premultiplied state in _set_components(). Similarly we don't
* have to worry about updating the ->components state in
* _set_premultiplied().
*/
texture->premultiplied = TRUE;
}
static void
_cogl_texture_free_loader (CoglTexture *texture)
{
if (texture->loader)
{
CoglTextureLoader *loader = texture->loader;
switch (loader->src_type)
{
case COGL_TEXTURE_SOURCE_TYPE_SIZED:
case COGL_TEXTURE_SOURCE_TYPE_EGL_IMAGE:
case COGL_TEXTURE_SOURCE_TYPE_GL_FOREIGN:
case COGL_TEXTURE_SOURCE_TYPE_EGL_IMAGE_EXTERNAL:
break;
case COGL_TEXTURE_SOURCE_TYPE_BITMAP:
cogl_object_unref (loader->src.bitmap.bitmap);
break;
}
g_slice_free (CoglTextureLoader, loader);
texture->loader = NULL;
}
}
CoglTextureLoader *
_cogl_texture_create_loader (void)
{
return g_slice_new0 (CoglTextureLoader);
}
void
_cogl_texture_free (CoglTexture *texture)
{
_cogl_texture_free_loader (texture);
g_free (texture);
}
CoglBool
_cogl_texture_needs_premult_conversion (CoglPixelFormat src_format,
CoglPixelFormat dst_format)
{
return ((src_format & dst_format & COGL_A_BIT) &&
src_format != COGL_PIXEL_FORMAT_A_8 &&
dst_format != COGL_PIXEL_FORMAT_A_8 &&
(src_format & COGL_PREMULT_BIT) !=
(dst_format & COGL_PREMULT_BIT));
}
CoglBool
_cogl_texture_is_foreign (CoglTexture *texture)
{
if (texture->vtable->is_foreign)
return texture->vtable->is_foreign (texture);
else
return FALSE;
}
unsigned int
cogl_texture_get_width (CoglTexture *texture)
{
return texture->width;
}
unsigned int
cogl_texture_get_height (CoglTexture *texture)
{
return texture->height;
}
CoglPixelFormat
_cogl_texture_get_format (CoglTexture *texture)
{
if (!texture->allocated)
cogl_texture_allocate (texture, NULL);
return texture->vtable->get_format (texture);
}
int
cogl_texture_get_max_waste (CoglTexture *texture)
{
return texture->vtable->get_max_waste (texture);
}
int
_cogl_texture_get_n_levels (CoglTexture *texture)
{
int width = cogl_texture_get_width (texture);
int height = cogl_texture_get_height (texture);
int max_dimension = MAX (width, height);
if (cogl_is_texture_3d (texture))
{
CoglTexture3D *tex_3d = COGL_TEXTURE_3D (texture);
max_dimension = MAX (max_dimension, tex_3d->depth);
}
return _cogl_util_fls (max_dimension);
}
void
_cogl_texture_get_level_size (CoglTexture *texture,
int level,
int *width,
int *height,
int *depth)
{
int current_width = cogl_texture_get_width (texture);
int current_height = cogl_texture_get_height (texture);
int current_depth;
int i;
if (cogl_is_texture_3d (texture))
{
CoglTexture3D *tex_3d = COGL_TEXTURE_3D (texture);
current_depth = tex_3d->depth;
}
else
current_depth = 0;
/* NB: The OpenGL spec (like D3D) uses a floor() convention to
* round down the size of a mipmap level when dividing the size
* of the previous level results in a fraction...
*/
for (i = 0; i < level; i++)
{
current_width = MAX (1, current_width >> 1);
current_height = MAX (1, current_height >> 1);
current_depth = MAX (1, current_depth >> 1);
}
if (width)
*width = current_width;
if (height)
*height = current_height;
if (depth)
*depth = current_depth;
}
CoglBool
cogl_texture_is_sliced (CoglTexture *texture)
{
if (!texture->allocated)
cogl_texture_allocate (texture, NULL);
return texture->vtable->is_sliced (texture);
}
/* If this returns FALSE, that implies _foreach_sub_texture_in_region
* will be needed to iterate over multiple sub textures for regions whos
* texture coordinates extend out of the range [0,1]
*/
CoglBool
_cogl_texture_can_hardware_repeat (CoglTexture *texture)
{
if (!texture->allocated)
cogl_texture_allocate (texture, NULL);
return texture->vtable->can_hardware_repeat (texture);
}
/* NB: You can't use this with textures comprised of multiple sub textures (use
* cogl_texture_is_sliced() to check) since coordinate transformation for such
* textures will be different for each slice. */
void
_cogl_texture_transform_coords_to_gl (CoglTexture *texture,
float *s,
float *t)
{
texture->vtable->transform_coords_to_gl (texture, s, t);
}
CoglTransformResult
_cogl_texture_transform_quad_coords_to_gl (CoglTexture *texture,
float *coords)
{
return texture->vtable->transform_quad_coords_to_gl (texture, coords);
}
CoglBool
cogl_texture_get_gl_texture (CoglTexture *texture,
GLuint *out_gl_handle,
GLenum *out_gl_target)
{
if (!texture->allocated)
cogl_texture_allocate (texture, NULL);
return texture->vtable->get_gl_texture (texture,
out_gl_handle, out_gl_target);
}
CoglTextureType
_cogl_texture_get_type (CoglTexture *texture)
{
return texture->vtable->get_type (texture);
}
void
_cogl_texture_pre_paint (CoglTexture *texture, CoglTexturePrePaintFlags flags)
{
/* Assert that the storage for the texture exists already if we're
* about to reference it for painting.
*
* Note: we abort on error here since it's a bit late to do anything
* about it if we fail to allocate the texture and the app could
* have explicitly allocated the texture earlier to handle problems
* gracefully.
*
* XXX: Maybe it could even be considered a programmer error if the
* texture hasn't been allocated by this point since it implies we
* are abount to paint with undefined texture contents?
*/
cogl_texture_allocate (texture, NULL);
texture->vtable->pre_paint (texture, flags);
}
void
_cogl_texture_ensure_non_quad_rendering (CoglTexture *texture)
{
texture->vtable->ensure_non_quad_rendering (texture);
}
CoglBool
_cogl_texture_set_region_from_bitmap (CoglTexture *texture,
int src_x,
int src_y,
int width,
int height,
CoglBitmap *bmp,
int dst_x,
int dst_y,
int level,
CoglError **error)
{
_COGL_RETURN_VAL_IF_FAIL ((cogl_bitmap_get_width (bmp) - src_x)
>= width, FALSE);
_COGL_RETURN_VAL_IF_FAIL ((cogl_bitmap_get_height (bmp) - src_y)
>= height, FALSE);
_COGL_RETURN_VAL_IF_FAIL (width > 0, FALSE);
_COGL_RETURN_VAL_IF_FAIL (height > 0, FALSE);
/* Assert that the storage for this texture has been allocated */
if (!cogl_texture_allocate (texture, error))
return FALSE;
/* Note that we don't prepare the bitmap for upload here because
some backends may be internally using a different format for the
actual GL texture than that reported by
_cogl_texture_get_format. For example the atlas textures are
always stored in an RGBA texture even if the texture format is
advertised as RGB. */
return texture->vtable->set_region (texture,
src_x, src_y,
dst_x, dst_y,
width, height,
level,
bmp,
error);
}
CoglBool
cogl_texture_set_region_from_bitmap (CoglTexture *texture,
int src_x,
int src_y,
int dst_x,
int dst_y,
unsigned int dst_width,
unsigned int dst_height,
CoglBitmap *bitmap)
{
CoglError *ignore_error = NULL;
CoglBool status =
_cogl_texture_set_region_from_bitmap (texture,
src_x, src_y,
dst_width, dst_height,
bitmap,
dst_x, dst_y,
0, /* level */
&ignore_error);
if (!status)
cogl_error_free (ignore_error);
return status;
}
CoglBool
_cogl_texture_set_region (CoglTexture *texture,
int width,
int height,
CoglPixelFormat format,
int rowstride,
const uint8_t *data,
int dst_x,
int dst_y,
int level,
CoglError **error)
{
CoglContext *ctx = texture->context;
CoglBitmap *source_bmp;
CoglBool ret;
_COGL_RETURN_VAL_IF_FAIL (format != COGL_PIXEL_FORMAT_ANY, FALSE);
/* Rowstride from width if none specified */
if (rowstride == 0)
rowstride = _cogl_pixel_format_get_bytes_per_pixel (format) * width;
/* Init source bitmap */
source_bmp = cogl_bitmap_new_for_data (ctx,
width, height,
format,
rowstride,
(uint8_t *) data);
ret = _cogl_texture_set_region_from_bitmap (texture,
0, 0,
width, height,
source_bmp,
dst_x, dst_y,
level,
error);
cogl_object_unref (source_bmp);
return ret;
}
CoglBool
cogl_texture_set_region (CoglTexture *texture,
int src_x,
int src_y,
int dst_x,
int dst_y,
unsigned int dst_width,
unsigned int dst_height,
int width,
int height,
CoglPixelFormat format,
unsigned int rowstride,
const uint8_t *data)
{
CoglError *ignore_error = NULL;
const uint8_t *first_pixel;
int bytes_per_pixel = _cogl_pixel_format_get_bytes_per_pixel (format);
CoglBool status;
/* Rowstride from width if none specified */
if (rowstride == 0)
rowstride = bytes_per_pixel * width;
first_pixel = data + rowstride * src_y + bytes_per_pixel * src_x;
status = _cogl_texture_set_region (texture,
dst_width,
dst_height,
format,
rowstride,
first_pixel,
dst_x,
dst_y,
0,
&ignore_error);
if (!status)
cogl_error_free (ignore_error);
return status;
}
CoglBool
cogl_texture_set_data (CoglTexture *texture,
CoglPixelFormat format,
int rowstride,
const uint8_t *data,
int level,
CoglError **error)
{
int level_width;
int level_height;
_cogl_texture_get_level_size (texture,
level,
&level_width,
&level_height,
NULL);
return _cogl_texture_set_region (texture,
level_width,
level_height,
format,
rowstride,
data,
0, 0, /* dest x, y */
level,
error);
}
/* Reads back the contents of a texture by rendering it to the framebuffer
* and reading back the resulting pixels.
*
* It will perform multiple renders if the texture is larger than the
* current glViewport.
*
* It assumes the projection and modelview have already been setup so
* that rendering to 0,0 with the same width and height of the viewport
* will exactly cover the viewport.
*
* NB: Normally this approach isn't normally used since we can just use
* glGetTexImage, but may be used as a fallback in some circumstances.
*/
static CoglBool
do_texture_draw_and_read (CoglFramebuffer *fb,
CoglPipeline *pipeline,
CoglTexture *texture,
CoglBitmap *target_bmp,
float *viewport,
CoglError **error)
{
float rx1, ry1;
float rx2, ry2;
float tx1, ty1;
float tx2, ty2;
int bw, bh;
CoglBitmap *rect_bmp;
unsigned int tex_width, tex_height;
CoglContext *ctx = fb->context;
tex_width = cogl_texture_get_width (texture);
tex_height = cogl_texture_get_height (texture);
ry2 = 0;
ty2 = 0;
/* Walk Y axis until whole bitmap height consumed */
for (bh = tex_height; bh > 0; bh -= viewport[3])
{
/* Rectangle Y coords */
ry1 = ry2;
ry2 += (bh < viewport[3]) ? bh : viewport[3];
/* Normalized texture Y coords */
ty1 = ty2;
ty2 = (ry2 / (float) tex_height);
rx2 = 0;
tx2 = 0;
/* Walk X axis until whole bitmap width consumed */
for (bw = tex_width; bw > 0; bw-=viewport[2])
{
int width;
int height;
/* Rectangle X coords */
rx1 = rx2;
rx2 += (bw < viewport[2]) ? bw : viewport[2];
width = rx2 - rx1;
height = ry2 - ry1;
/* Normalized texture X coords */
tx1 = tx2;
tx2 = (rx2 / (float) tex_width);
/* Draw a portion of texture */
cogl_framebuffer_draw_textured_rectangle (fb,
pipeline,
0, 0,
rx2 - rx1,
ry2 - ry1,
tx1, ty1,
tx2, ty2);
/* Read into a temporary bitmap */
rect_bmp = _cogl_bitmap_new_with_malloc_buffer
(ctx,
width, height,
COGL_PIXEL_FORMAT_RGBA_8888_PRE,
error);
if (!rect_bmp)
return FALSE;
if (!_cogl_framebuffer_read_pixels_into_bitmap
(fb,
viewport[0], viewport[1],
COGL_READ_PIXELS_COLOR_BUFFER,
rect_bmp,
error))
{
cogl_object_unref (rect_bmp);
return FALSE;
}
/* Copy to target bitmap */
if (!_cogl_bitmap_copy_subregion (rect_bmp,
target_bmp,
0, 0,
rx1, ry1,
width,
height,
error))
{
cogl_object_unref (rect_bmp);
return FALSE;
}
/* Free temp bitmap */
cogl_object_unref (rect_bmp);
}
}
return TRUE;
}
/* Reads back the contents of a texture by rendering it to the framebuffer
* and reading back the resulting pixels.
*
* NB: Normally this approach isn't normally used since we can just use
* glGetTexImage, but may be used as a fallback in some circumstances.
*/
static CoglBool
_cogl_texture_draw_and_read (CoglTexture *texture,
CoglBitmap *target_bmp,
GLuint target_gl_format,
GLuint target_gl_type,
CoglError **error)
{
CoglFramebuffer *framebuffer = cogl_get_draw_framebuffer ();
CoglContext *ctx = framebuffer->context;
float save_viewport[4];
float viewport[4];
CoglBool status = FALSE;
viewport[0] = 0;
viewport[1] = 0;
viewport[2] = cogl_framebuffer_get_width (framebuffer);
viewport[3] = cogl_framebuffer_get_height (framebuffer);
cogl_framebuffer_get_viewport4fv (framebuffer, save_viewport);
_cogl_framebuffer_push_projection (framebuffer);
cogl_framebuffer_orthographic (framebuffer,
0, 0,
viewport[2],
viewport[3],
0, 100);
cogl_framebuffer_push_matrix (framebuffer);
cogl_framebuffer_identity_matrix (framebuffer);
/* Direct copy operation */
if (ctx->texture_download_pipeline == NULL)
{
ctx->texture_download_pipeline = cogl_pipeline_new (ctx);
cogl_pipeline_set_blend (ctx->texture_download_pipeline,
"RGBA = ADD (SRC_COLOR, 0)",
NULL);
}
cogl_pipeline_set_layer_texture (ctx->texture_download_pipeline, 0, texture);
cogl_pipeline_set_layer_combine (ctx->texture_download_pipeline,
0, /* layer */
"RGBA = REPLACE (TEXTURE)",
NULL);
cogl_pipeline_set_layer_filters (ctx->texture_download_pipeline, 0,
COGL_PIPELINE_FILTER_NEAREST,
COGL_PIPELINE_FILTER_NEAREST);
if (!do_texture_draw_and_read (framebuffer,
ctx->texture_download_pipeline,
texture, target_bmp, viewport,
error))
return FALSE;
/* XXX: As an alleged PowerVR driver bug workaround where the driver
* is apparently not maintaining the alpha component of some
* framebuffers we render the alpha component of the texture
* separately to be sure we retrieve all components of the texture.
*
* TODO: verify if this is still an issue
*/
if ((_cogl_texture_get_format (texture) & COGL_A_BIT)/* && a_bits == 0*/)
{
uint8_t *srcdata;
uint8_t *dstdata;
uint8_t *srcpixel;
uint8_t *dstpixel;
int target_width = cogl_bitmap_get_width (target_bmp);
int target_height = cogl_bitmap_get_height (target_bmp);
int target_rowstride = cogl_bitmap_get_rowstride (target_bmp);
int bpp = _cogl_pixel_format_get_bytes_per_pixel (COGL_PIXEL_FORMAT_RGBA_8888);
int alpha_rowstride = bpp * target_width;
CoglBitmap *alpha_bmp;
int x,y;
if ((dstdata = _cogl_bitmap_map (target_bmp,
COGL_BUFFER_ACCESS_WRITE,
COGL_BUFFER_MAP_HINT_DISCARD,
error)) == NULL)
goto EXIT;
/* Create temp bitmap for alpha values */
alpha_bmp =
_cogl_bitmap_new_with_malloc_buffer (ctx,
target_width,
target_height,
COGL_PIXEL_FORMAT_RGBA_8888,
error);
if (!alpha_bmp)
{
_cogl_bitmap_unmap (target_bmp);
goto EXIT;
}
/* Draw alpha values into RGB channels */
cogl_pipeline_set_layer_combine (ctx->texture_download_pipeline,
0, /* layer */
"RGBA = REPLACE (TEXTURE[A])",
NULL);
if (!do_texture_draw_and_read (framebuffer,
ctx->texture_download_pipeline,
texture, alpha_bmp, viewport,
error))
{
cogl_object_unref (alpha_bmp);
_cogl_bitmap_unmap (target_bmp);
goto EXIT;
}
/* Copy temp R to target A */
/* Note: we don't try to catch errors since "mapping" an
* malloc buffer should never fail */
srcdata = _cogl_bitmap_map (alpha_bmp,
COGL_BUFFER_ACCESS_READ,
0 /* hints */,
NULL);
for (y=0; y<target_height; ++y)
{
for (x=0; x<target_width; ++x)
{
srcpixel = srcdata + x*bpp;
dstpixel = dstdata + x*bpp;
dstpixel[3] = srcpixel[0];
}
srcdata += alpha_rowstride;
dstdata += target_rowstride;
}
_cogl_bitmap_unmap (alpha_bmp);
_cogl_bitmap_unmap (target_bmp);
cogl_object_unref (alpha_bmp);
}
status = TRUE;
EXIT:
/* Restore old state */
cogl_framebuffer_pop_matrix (framebuffer);
_cogl_framebuffer_pop_projection (framebuffer);
cogl_framebuffer_set_viewport (framebuffer,
save_viewport[0],
save_viewport[1],
save_viewport[2],
save_viewport[3]);
return status;
}
static CoglBool
get_texture_bits_via_offscreen (CoglTexture *meta_texture,
CoglTexture *sub_texture,
int x,
int y,
int width,
int height,
uint8_t *dst_bits,
unsigned int dst_rowstride,
CoglPixelFormat closest_format)
{
CoglContext *ctx = sub_texture->context;
CoglOffscreen *offscreen;
CoglFramebuffer *framebuffer;
CoglBitmap *bitmap;
CoglBool ret;
CoglError *ignore_error = NULL;
CoglPixelFormat real_format;
if (!cogl_has_feature (ctx, COGL_FEATURE_ID_OFFSCREEN))
return FALSE;
offscreen = _cogl_offscreen_new_with_texture_full
(sub_texture,
COGL_OFFSCREEN_DISABLE_DEPTH_AND_STENCIL,
0);
framebuffer = COGL_FRAMEBUFFER (offscreen);
if (!cogl_framebuffer_allocate (framebuffer, &ignore_error))
{
cogl_error_free (ignore_error);
return FALSE;
}
/* Currently the framebuffer's internal format corresponds to the
* internal format of @sub_texture but in the case of atlas textures
* it's possible that this format doesn't reflect the correct
* premultiplied alpha status or what components are valid since
* atlas textures are always stored in a shared texture with a
* format of _RGBA_8888.
*
* Here we override the internal format to make sure the
* framebuffer's internal format matches the internal format of the
* parent meta_texture instead.
*/
real_format = _cogl_texture_get_format (meta_texture);
_cogl_framebuffer_set_internal_format (framebuffer, real_format);
bitmap = cogl_bitmap_new_for_data (ctx,
width, height,
closest_format,
dst_rowstride,
dst_bits);
ret = _cogl_framebuffer_read_pixels_into_bitmap (framebuffer,
x, y,
COGL_READ_PIXELS_COLOR_BUFFER,
bitmap,
&ignore_error);
if (!ret)
cogl_error_free (ignore_error);
cogl_object_unref (bitmap);
cogl_object_unref (framebuffer);
return ret;
}
static CoglBool
get_texture_bits_via_copy (CoglTexture *texture,
int x,
int y,
int width,
int height,
uint8_t *dst_bits,
unsigned int dst_rowstride,
CoglPixelFormat dst_format)
{
unsigned int full_rowstride;
uint8_t *full_bits;
CoglBool ret = TRUE;
int bpp;
int full_tex_width, full_tex_height;
full_tex_width = cogl_texture_get_width (texture);
full_tex_height = cogl_texture_get_height (texture);
bpp = _cogl_pixel_format_get_bytes_per_pixel (dst_format);
full_rowstride = bpp * full_tex_width;
full_bits = g_malloc (full_rowstride * full_tex_height);
if (texture->vtable->get_data (texture,
dst_format,
full_rowstride,
full_bits))
{
uint8_t *dst = dst_bits;
uint8_t *src = full_bits + x * bpp + y * full_rowstride;
int i;
for (i = 0; i < height; i++)
{
memcpy (dst, src, bpp * width);
dst += dst_rowstride;
src += full_rowstride;
}
}
else
ret = FALSE;
g_free (full_bits);
return ret;
}
typedef struct
{
CoglTexture *meta_texture;
int orig_width;
int orig_height;
CoglBitmap *target_bmp;
uint8_t *target_bits;
CoglBool success;
CoglError *error;
} CoglTextureGetData;
static void
texture_get_cb (CoglTexture *subtexture,
const float *subtexture_coords,
const float *virtual_coords,
void *user_data)
{
CoglTextureGetData *tg_data = user_data;
CoglTexture *meta_texture = tg_data->meta_texture;
CoglPixelFormat closest_format = cogl_bitmap_get_format (tg_data->target_bmp);
int bpp = _cogl_pixel_format_get_bytes_per_pixel (closest_format);
unsigned int rowstride = cogl_bitmap_get_rowstride (tg_data->target_bmp);
int subtexture_width = cogl_texture_get_width (subtexture);
int subtexture_height = cogl_texture_get_height (subtexture);
int x_in_subtexture = (int) (0.5 + subtexture_width * subtexture_coords[0]);
int y_in_subtexture = (int) (0.5 + subtexture_height * subtexture_coords[1]);
int width = ((int) (0.5 + subtexture_width * subtexture_coords[2])
- x_in_subtexture);
int height = ((int) (0.5 + subtexture_height * subtexture_coords[3])
- y_in_subtexture);
int x_in_bitmap = (int) (0.5 + tg_data->orig_width * virtual_coords[0]);
int y_in_bitmap = (int) (0.5 + tg_data->orig_height * virtual_coords[1]);
uint8_t *dst_bits;
if (!tg_data->success)
return;
dst_bits = tg_data->target_bits + x_in_bitmap * bpp + y_in_bitmap * rowstride;
/* If we can read everything as a single slice, then go ahead and do that
* to avoid allocating an FBO. We'll leave it up to the GL implementation to
* do glGetTexImage as efficiently as possible. (GLES doesn't have that,
* so we'll fall through)
*/
if (x_in_subtexture == 0 && y_in_subtexture == 0 &&
width == subtexture_width && height == subtexture_height)
{
if (subtexture->vtable->get_data (subtexture,
closest_format,
rowstride,
dst_bits))
return;
}
/* Next best option is a FBO and glReadPixels */
if (get_texture_bits_via_offscreen (meta_texture,
subtexture,
x_in_subtexture, y_in_subtexture,
width, height,
dst_bits,
rowstride,
closest_format))
return;
/* Getting ugly: read the entire texture, copy out the part we want */
if (get_texture_bits_via_copy (subtexture,
x_in_subtexture, y_in_subtexture,
width, height,
dst_bits,
rowstride,
closest_format))
return;
/* No luck, the caller will fall back to the draw-to-backbuffer and
* read implementation */
tg_data->success = FALSE;
}
int
cogl_texture_get_data (CoglTexture *texture,
CoglPixelFormat format,
unsigned int rowstride,
uint8_t *data)
{
CoglContext *ctx = texture->context;
int bpp;
int byte_size;
CoglPixelFormat closest_format;
GLenum closest_gl_format;
GLenum closest_gl_type;
CoglBitmap *target_bmp;
int tex_width;
int tex_height;
CoglPixelFormat texture_format;
CoglError *ignore_error = NULL;
CoglTextureGetData tg_data;
texture_format = _cogl_texture_get_format (texture);
/* Default to internal format if none specified */
if (format == COGL_PIXEL_FORMAT_ANY)
format = texture_format;
tex_width = cogl_texture_get_width (texture);
tex_height = cogl_texture_get_height (texture);
/* Rowstride from texture width if none specified */
bpp = _cogl_pixel_format_get_bytes_per_pixel (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 =
ctx->texture_driver->find_best_gl_get_data_format (ctx,
texture_format,
format,
&closest_gl_format,
&closest_gl_type);
/* We can assume that whatever data GL gives us will have the
premult status of the original texture */
if (COGL_PIXEL_FORMAT_CAN_HAVE_PREMULT (closest_format))
closest_format = ((closest_format & ~COGL_PREMULT_BIT) |
(texture_format & COGL_PREMULT_BIT));
/* If the application is requesting a conversion from a
* component-alpha texture and the driver doesn't support them
* natively then we can only read into an alpha-format buffer. In
* this case the driver will be faking the alpha textures with a
* red-component texture and it won't swizzle to the correct format
* while reading */
if (!_cogl_has_private_feature (ctx, COGL_PRIVATE_FEATURE_ALPHA_TEXTURES))
{
if (texture_format == COGL_PIXEL_FORMAT_A_8)
{
closest_format = COGL_PIXEL_FORMAT_A_8;
closest_gl_format = GL_RED;
closest_gl_type = GL_UNSIGNED_BYTE;
}
else if (format == COGL_PIXEL_FORMAT_A_8)
{
/* If we are converting to a component-alpha texture then we
* need to read all of the components to a temporary buffer
* because there is no way to get just the 4th component.
* Note: it doesn't matter whether the texture is
* pre-multiplied here because we're only going to look at
* the alpha component */
closest_format = COGL_PIXEL_FORMAT_RGBA_8888;
closest_gl_format = GL_RGBA;
closest_gl_type = GL_UNSIGNED_BYTE;
}
}
/* Is the requested format supported? */
if (closest_format == format)
/* Target user data directly */
target_bmp = cogl_bitmap_new_for_data (ctx,
tex_width,
tex_height,
format,
rowstride,
data);
else
{
target_bmp = _cogl_bitmap_new_with_malloc_buffer (ctx,
tex_width, tex_height,
closest_format,
&ignore_error);
if (!target_bmp)
{
cogl_error_free (ignore_error);
return 0;
}
}
tg_data.target_bits = _cogl_bitmap_map (target_bmp, COGL_BUFFER_ACCESS_WRITE,
COGL_BUFFER_MAP_HINT_DISCARD,
&ignore_error);
if (tg_data.target_bits)
{
tg_data.meta_texture = texture;
tg_data.orig_width = tex_width;
tg_data.orig_height = tex_height;
tg_data.target_bmp = target_bmp;
tg_data.error = NULL;
tg_data.success = TRUE;
/* If there are any dependent framebuffers on the texture then we
need to flush their journals so the texture contents will be
up-to-date */
_cogl_texture_flush_journal_rendering (texture);
/* 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_meta_texture_foreach_in_region (COGL_META_TEXTURE (texture),
0, 0, 1, 1,
COGL_PIPELINE_WRAP_MODE_REPEAT,
COGL_PIPELINE_WRAP_MODE_REPEAT,
texture_get_cb,
&tg_data);
_cogl_bitmap_unmap (target_bmp);
}
else
{
cogl_error_free (ignore_error);
tg_data.success = FALSE;
}
/* 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)
{
if (!_cogl_texture_draw_and_read (texture, target_bmp,
closest_gl_format,
closest_gl_type,
&ignore_error))
{
/* We have no more fallbacks so we just give up and
* hope for the best */
g_warning ("Failed to read texture since draw-and-read "
"fallback failed: %s", ignore_error->message);
cogl_error_free (ignore_error);
cogl_object_unref (target_bmp);
return 0;
}
}
/* Was intermediate used? */
if (closest_format != format)
{
CoglBitmap *new_bmp;
CoglBool result;
CoglError *error = NULL;
/* Convert to requested format directly into the user's buffer */
new_bmp = cogl_bitmap_new_for_data (ctx,
tex_width, tex_height,
format,
rowstride,
data);
result = _cogl_bitmap_convert_into_bitmap (target_bmp, new_bmp, &error);
if (!result)
{
cogl_error_free (error);
/* Return failure after cleaning up */
byte_size = 0;
}
cogl_object_unref (new_bmp);
}
cogl_object_unref (target_bmp);
return byte_size;
}
static void
_cogl_texture_framebuffer_destroy_cb (void *user_data,
void *instance)
{
CoglTexture *tex = user_data;
CoglFramebuffer *framebuffer = instance;
tex->framebuffers = g_list_remove (tex->framebuffers, framebuffer);
}
void
_cogl_texture_associate_framebuffer (CoglTexture *texture,
CoglFramebuffer *framebuffer)
{
static CoglUserDataKey framebuffer_destroy_notify_key;
/* Note: we don't take a reference on the framebuffer here because
* that would introduce a circular reference. */
texture->framebuffers = g_list_prepend (texture->framebuffers, framebuffer);
/* Since we haven't taken a reference on the framebuffer we setup
* some private data so we will be notified if it is destroyed... */
_cogl_object_set_user_data (COGL_OBJECT (framebuffer),
&framebuffer_destroy_notify_key,
texture,
_cogl_texture_framebuffer_destroy_cb);
}
const GList *
_cogl_texture_get_associated_framebuffers (CoglTexture *texture)
{
return texture->framebuffers;
}
void
_cogl_texture_flush_journal_rendering (CoglTexture *texture)
{
GList *l;
/* It could be that a referenced texture is part of a framebuffer
* which has an associated journal that must be flushed before it
* can be sampled from by the current primitive... */
for (l = texture->framebuffers; l; l = l->next)
_cogl_framebuffer_flush_journal (l->data);
}
/* This function lets you define a meta texture as a grid of textures
* whereby the x and y grid-lines are defined by an array of
* CoglSpans. With that grid based description this function can then
* iterate all the cells of the grid that lye within a region
* specified as virtual, meta-texture, coordinates. This function can
* also cope with regions that extend beyond the original meta-texture
* grid by iterating cells repeatedly according to the wrap_x/y
* arguments.
*
* To differentiate between texture coordinates of a specific, real,
* slice texture and the texture coordinates of a composite, meta
* texture, the coordinates of the meta texture are called "virtual"
* coordinates and the coordinates of spans are called "slice"
* coordinates.
*
* Note: no guarantee is given about the order in which the slices
* will be visited.
*
* Note: The slice coordinates passed to @callback are always
* normalized coordinates even if the span coordinates aren't
* normalized.
*/
void
_cogl_texture_spans_foreach_in_region (CoglSpan *x_spans,
int n_x_spans,
CoglSpan *y_spans,
int n_y_spans,
CoglTexture **textures,
float *virtual_coords,
float x_normalize_factor,
float y_normalize_factor,
CoglPipelineWrapMode wrap_x,
CoglPipelineWrapMode wrap_y,
CoglMetaTextureCallback callback,
void *user_data)
{
CoglSpanIter iter_x;
CoglSpanIter iter_y;
float slice_coords[4];
float span_virtual_coords[4];
/* Iterate the y axis of the virtual rectangle */
for (_cogl_span_iter_begin (&iter_y,
y_spans,
n_y_spans,
y_normalize_factor,
virtual_coords[1],
virtual_coords[3],
wrap_y);
!_cogl_span_iter_end (&iter_y);
_cogl_span_iter_next (&iter_y))
{
if (iter_y.flipped)
{
slice_coords[1] = iter_y.intersect_end;
slice_coords[3] = iter_y.intersect_start;
span_virtual_coords[1] = iter_y.intersect_end;
span_virtual_coords[3] = iter_y.intersect_start;
}
else
{
slice_coords[1] = iter_y.intersect_start;
slice_coords[3] = iter_y.intersect_end;
span_virtual_coords[1] = iter_y.intersect_start;
span_virtual_coords[3] = iter_y.intersect_end;
}
/* Map the current intersection to normalized slice coordinates */
slice_coords[1] = (slice_coords[1] - iter_y.pos) / iter_y.span->size;
slice_coords[3] = (slice_coords[3] - iter_y.pos) / iter_y.span->size;
/* Iterate the x axis of the virtual rectangle */
for (_cogl_span_iter_begin (&iter_x,
x_spans,
n_x_spans,
x_normalize_factor,
virtual_coords[0],
virtual_coords[2],
wrap_x);
!_cogl_span_iter_end (&iter_x);
_cogl_span_iter_next (&iter_x))
{
CoglTexture *span_tex;
if (iter_x.flipped)
{
slice_coords[0] = iter_x.intersect_end;
slice_coords[2] = iter_x.intersect_start;
span_virtual_coords[0] = iter_x.intersect_end;
span_virtual_coords[2] = iter_x.intersect_start;
}
else
{
slice_coords[0] = iter_x.intersect_start;
slice_coords[2] = iter_x.intersect_end;
span_virtual_coords[0] = iter_x.intersect_start;
span_virtual_coords[2] = iter_x.intersect_end;
}
/* Map the current intersection to normalized slice coordinates */
slice_coords[0] = (slice_coords[0] - iter_x.pos) / iter_x.span->size;
slice_coords[2] = (slice_coords[2] - iter_x.pos) / iter_x.span->size;
/* Pluck out the cogl texture for this span */
span_tex = textures[iter_y.index * n_x_spans + iter_x.index];
callback (COGL_TEXTURE (span_tex),
slice_coords,
span_virtual_coords,
user_data);
}
}
}
void
_cogl_texture_set_allocated (CoglTexture *texture,
CoglPixelFormat internal_format,
int width,
int height)
{
_cogl_texture_set_internal_format (texture, internal_format);
texture->width = width;
texture->height = height;
texture->allocated = TRUE;
_cogl_texture_free_loader (texture);
}
CoglBool
cogl_texture_allocate (CoglTexture *texture,
CoglError **error)
{
if (texture->allocated)
return TRUE;
if (texture->components == COGL_TEXTURE_COMPONENTS_RG &&
!cogl_has_feature (texture->context, COGL_FEATURE_ID_TEXTURE_RG))
_cogl_set_error (error,
COGL_TEXTURE_ERROR,
COGL_TEXTURE_ERROR_FORMAT,
"A red-green texture was requested but the driver "
"does not support them");
texture->allocated = texture->vtable->allocate (texture, error);
return texture->allocated;
}
void
_cogl_texture_set_internal_format (CoglTexture *texture,
CoglPixelFormat internal_format)
{
texture->premultiplied = FALSE;
if (internal_format == COGL_PIXEL_FORMAT_ANY)
internal_format = COGL_PIXEL_FORMAT_RGBA_8888_PRE;
if (internal_format == COGL_PIXEL_FORMAT_A_8)
{
texture->components = COGL_TEXTURE_COMPONENTS_A;
return;
}
else if (internal_format == COGL_PIXEL_FORMAT_RG_88)
{
texture->components = COGL_TEXTURE_COMPONENTS_RG;
return;
}
else if (internal_format & COGL_DEPTH_BIT)
{
texture->components = COGL_TEXTURE_COMPONENTS_DEPTH;
return;
}
else if (internal_format & COGL_A_BIT)
{
texture->components = COGL_TEXTURE_COMPONENTS_RGBA;
if (internal_format & COGL_PREMULT_BIT)
texture->premultiplied = TRUE;
return;
}
else
texture->components = COGL_TEXTURE_COMPONENTS_RGB;
}
CoglPixelFormat
_cogl_texture_determine_internal_format (CoglTexture *texture,
CoglPixelFormat src_format)
{
switch (texture->components)
{
case COGL_TEXTURE_COMPONENTS_DEPTH:
if (src_format & COGL_DEPTH_BIT)
return src_format;
else
{
CoglContext *ctx = texture->context;
if (_cogl_has_private_feature (ctx,
COGL_PRIVATE_FEATURE_EXT_PACKED_DEPTH_STENCIL) ||
_cogl_has_private_feature (ctx,
COGL_PRIVATE_FEATURE_OES_PACKED_DEPTH_STENCIL))
{
return COGL_PIXEL_FORMAT_DEPTH_24_STENCIL_8;
}
else
return COGL_PIXEL_FORMAT_DEPTH_16;
}
case COGL_TEXTURE_COMPONENTS_A:
return COGL_PIXEL_FORMAT_A_8;
case COGL_TEXTURE_COMPONENTS_RG:
return COGL_PIXEL_FORMAT_RG_88;
case COGL_TEXTURE_COMPONENTS_RGB:
if (src_format != COGL_PIXEL_FORMAT_ANY &&
!(src_format & COGL_A_BIT) && !(src_format & COGL_DEPTH_BIT))
return src_format;
else
return COGL_PIXEL_FORMAT_RGB_888;
case COGL_TEXTURE_COMPONENTS_RGBA:
{
CoglPixelFormat format;
if (src_format != COGL_PIXEL_FORMAT_ANY &&
(src_format & COGL_A_BIT) && src_format != COGL_PIXEL_FORMAT_A_8)
format = src_format;
else
format = COGL_PIXEL_FORMAT_RGBA_8888;
if (texture->premultiplied)
{
if (COGL_PIXEL_FORMAT_CAN_HAVE_PREMULT (format))
return format |= COGL_PREMULT_BIT;
else
return COGL_PIXEL_FORMAT_RGBA_8888_PRE;
}
else
return format & ~COGL_PREMULT_BIT;
}
}
g_return_val_if_reached (COGL_PIXEL_FORMAT_RGBA_8888_PRE);
}
void
cogl_texture_set_components (CoglTexture *texture,
CoglTextureComponents components)
{
_COGL_RETURN_IF_FAIL (!texture->allocated);
if (texture->components == components)
return;
texture->components = components;
}
CoglTextureComponents
cogl_texture_get_components (CoglTexture *texture)
{
return texture->components;
}
void
cogl_texture_set_premultiplied (CoglTexture *texture,
CoglBool premultiplied)
{
_COGL_RETURN_IF_FAIL (!texture->allocated);
premultiplied = !!premultiplied;
if (texture->premultiplied == premultiplied)
return;
texture->premultiplied = premultiplied;
}
CoglBool
cogl_texture_get_premultiplied (CoglTexture *texture)
{
return texture->premultiplied;
}
void
_cogl_texture_copy_internal_format (CoglTexture *src,
CoglTexture *dest)
{
cogl_texture_set_components (dest, src->components);
cogl_texture_set_premultiplied (dest, src->premultiplied);
}
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