cairo_int_status_t
_cairo_composite_rectangles_lazy_init_for_glyphs (cairo_composite_rectangles_t *extents,
cairo_surface_t *surface,
cairo_operator_t op,
const cairo_pattern_t *source,
cairo_scaled_font_t *scaled_font,
cairo_glyph_t *glyphs,
int num_glyphs,
const cairo_clip_t *clip,
cairo_bool_t *overlap)
{
cairo_status_t status;
cairo_bool_t should_be_lazy = TRUE;
if (! _cairo_composite_rectangles_init (extents, surface, op, source,
clip, &should_be_lazy))
return CAIRO_INT_STATUS_NOTHING_TO_DO;
status = _cairo_scaled_font_glyph_device_extents (scaled_font,
glyphs, num_glyphs,
&extents->source,
overlap);
if (unlikely (status))
return status;
extents->clip = _cairo_clip_copy (clip);
return CAIRO_INT_STATUS_SUCCESS;
}
cairo_int_status_t
_cairo_composite_rectangles_init_for_glyphs (cairo_composite_rectangles_t *extents,
int surface_width, int surface_height,
cairo_operator_t op,
const cairo_pattern_t *source,
cairo_scaled_font_t *scaled_font,
cairo_glyph_t *glyphs,
int num_glyphs,
cairo_clip_t *clip,
cairo_bool_t *overlap)
{
cairo_status_t status;
if (! _cairo_composite_rectangles_init (extents,
surface_width, surface_height,
op, source, clip))
{
return CAIRO_INT_STATUS_NOTHING_TO_DO;
}
status = _cairo_scaled_font_glyph_device_extents (scaled_font,
glyphs, num_glyphs,
&extents->mask,
overlap);
if (unlikely (status))
return status;
return _cairo_composite_rectangles_intersect (extents);
}
cairo_status_t
_cairo_surface_fallback_show_glyphs (cairo_surface_t *surface,
cairo_operator_t op,
const cairo_pattern_t *source,
cairo_glyph_t *glyphs,
int num_glyphs,
cairo_scaled_font_t *scaled_font)
{
cairo_status_t status;
cairo_rectangle_int_t extents;
cairo_show_glyphs_info_t glyph_info;
status = _cairo_surface_get_extents (surface, &extents);
if (unlikely (status))
return status;
if (_cairo_operator_bounded_by_mask (op)) {
cairo_rectangle_int_t glyph_extents;
status = _cairo_scaled_font_glyph_device_extents (scaled_font,
glyphs,
num_glyphs,
&glyph_extents);
if (unlikely (status))
return status;
if (! _cairo_rectangle_intersect (&extents, &glyph_extents))
return CAIRO_STATUS_SUCCESS;
}
status = _cairo_clip_intersect_to_rectangle (surface->clip, &extents);
if (unlikely (status))
return status;
glyph_info.font = scaled_font;
glyph_info.glyphs = glyphs;
glyph_info.num_glyphs = num_glyphs;
status = _clip_and_composite (surface->clip,
op,
source,
_cairo_surface_old_show_glyphs_draw_func,
&glyph_info,
surface,
&extents);
return status;
}
cairo_int_status_t
_cairo_composite_rectangles_init_for_glyphs (cairo_composite_rectangles_t *extents,
cairo_surface_t *surface,
cairo_operator_t op,
const cairo_pattern_t *source,
cairo_scaled_font_t *scaled_font,
cairo_glyph_t *glyphs,
int num_glyphs,
const cairo_clip_t *clip,
cairo_bool_t *overlap)
{
cairo_status_t status;
if (! _cairo_composite_rectangles_init (extents, surface, op, source, clip))
return CAIRO_INT_STATUS_NOTHING_TO_DO;
/* Computing the exact bbox and the overlap is expensive.
* First perform a cheap test to see if the glyphs are all clipped out.
*/
if (extents->is_bounded & CAIRO_OPERATOR_BOUND_BY_MASK &&
_cairo_scaled_font_glyph_approximate_extents (scaled_font,
glyphs, num_glyphs,
&extents->mask))
{
if (! _cairo_rectangle_intersect (&extents->bounded, &extents->mask))
return CAIRO_INT_STATUS_NOTHING_TO_DO;
}
status = _cairo_scaled_font_glyph_device_extents (scaled_font,
glyphs, num_glyphs,
&extents->mask,
overlap);
if (unlikely (status))
return status;
if (overlap && *overlap &&
scaled_font->options.antialias == CAIRO_ANTIALIAS_NONE &&
_cairo_pattern_is_opaque_solid (&extents->source_pattern.base))
{
*overlap = FALSE;
}
return _cairo_composite_rectangles_intersect (extents, clip);
}
static cairo_int_status_t
_cairo_analysis_surface_show_text_glyphs (void *abstract_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const char *utf8,
int utf8_len,
cairo_glyph_t *glyphs,
int num_glyphs,
const cairo_text_cluster_t *clusters,
int num_clusters,
cairo_text_cluster_flags_t cluster_flags,
cairo_scaled_font_t *scaled_font,
cairo_rectangle_int_t *show_text_glyphs_extents)
{
cairo_analysis_surface_t *surface = abstract_surface;
cairo_status_t status, backend_status;
cairo_rectangle_int_t extents, glyph_extents;
cairo_bool_t is_empty;
/* Adapted from _cairo_surface_show_glyphs */
backend_status = CAIRO_INT_STATUS_UNSUPPORTED;
if (surface->target->backend->show_text_glyphs)
backend_status = surface->target->backend->show_text_glyphs (surface->target, op,
source,
utf8, utf8_len,
glyphs, num_glyphs,
clusters, num_clusters, cluster_flags,
scaled_font, NULL);
if (backend_status == CAIRO_INT_STATUS_UNSUPPORTED && surface->target->backend->show_glyphs) {
int remaining_glyphs = num_glyphs;
backend_status = surface->target->backend->show_glyphs (surface->target, op,
source,
glyphs, num_glyphs,
scaled_font,
&remaining_glyphs, NULL);
glyphs += num_glyphs - remaining_glyphs;
num_glyphs = remaining_glyphs;
if (remaining_glyphs == 0)
backend_status = CAIRO_STATUS_SUCCESS;
}
if (backend_status == CAIRO_INT_STATUS_ANALYZE_META_SURFACE_PATTERN)
backend_status = _analyze_meta_surface_pattern (surface, source);
status = _cairo_surface_get_extents (&surface->base, &extents);
if (_cairo_status_is_error (status))
return status;
if (_cairo_operator_bounded_by_source (op)) {
cairo_rectangle_int_t source_extents;
status = _cairo_pattern_get_extents (source, &source_extents);
if (unlikely (status))
return status;
is_empty = _cairo_rectangle_intersect (&extents, &source_extents);
}
is_empty = _cairo_rectangle_intersect (&extents, &surface->current_clip);
if (_cairo_operator_bounded_by_mask (op)) {
status = _cairo_scaled_font_glyph_device_extents (scaled_font,
glyphs,
num_glyphs,
&glyph_extents);
if (unlikely (status))
return status;
is_empty = _cairo_rectangle_intersect (&extents, &glyph_extents);
}
if (show_text_glyphs_extents)
*show_text_glyphs_extents = extents;
status = _add_operation (surface, &extents, backend_status);
return status;
}
static cairo_int_status_t
_cairo_analysis_surface_show_text_glyphs (void *abstract_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const char *utf8,
int utf8_len,
cairo_glyph_t *glyphs,
int num_glyphs,
const cairo_text_cluster_t *clusters,
int num_clusters,
cairo_text_cluster_flags_t cluster_flags,
cairo_scaled_font_t *scaled_font,
const cairo_clip_t *clip)
{
cairo_analysis_surface_t *surface = abstract_surface;
cairo_int_status_t status, backend_status;
cairo_rectangle_int_t extents, glyph_extents;
/* Adapted from _cairo_surface_show_glyphs */
backend_status = CAIRO_INT_STATUS_UNSUPPORTED;
if (surface->target->backend->show_text_glyphs != NULL) {
backend_status =
surface->target->backend->show_text_glyphs (surface->target, op,
source,
utf8, utf8_len,
glyphs, num_glyphs,
clusters, num_clusters,
cluster_flags,
scaled_font,
clip);
if (_cairo_int_status_is_error (backend_status))
return backend_status;
}
if (backend_status == CAIRO_INT_STATUS_UNSUPPORTED &&
surface->target->backend->show_glyphs != NULL)
{
backend_status =
surface->target->backend->show_glyphs (surface->target, op,
source,
glyphs, num_glyphs,
scaled_font,
clip);
if (_cairo_int_status_is_error (backend_status))
return backend_status;
}
if (backend_status == CAIRO_INT_STATUS_ANALYZE_RECORDING_SURFACE_PATTERN)
backend_status = _analyze_recording_surface_pattern (surface, source);
_cairo_analysis_surface_operation_extents (surface,
op, source, clip,
&extents);
if (_cairo_operator_bounded_by_mask (op)) {
status = _cairo_scaled_font_glyph_device_extents (scaled_font,
glyphs,
num_glyphs,
&glyph_extents,
NULL);
if (unlikely (status))
return status;
_cairo_rectangle_intersect (&extents, &glyph_extents);
}
return _add_operation (surface, &extents, backend_status);
}
cairo_int_status_t
_cairo_gl_surface_show_glyphs (void *abstract_dst,
cairo_operator_t op,
const cairo_pattern_t *source,
cairo_glyph_t *glyphs,
int num_glyphs,
cairo_scaled_font_t *scaled_font,
cairo_clip_t *clip,
int *remaining_glyphs)
{
cairo_gl_surface_t *dst = abstract_dst;
cairo_rectangle_int_t surface_extents;
cairo_rectangle_int_t extents;
cairo_region_t *clip_region = NULL;
cairo_solid_pattern_t solid_pattern;
cairo_bool_t overlap, use_mask = FALSE;
cairo_status_t status;
if (! GLEW_ARB_vertex_buffer_object)
return UNSUPPORTED ("requires ARB_vertex_buffer_object");
if (! _cairo_gl_operator_is_supported (op))
return UNSUPPORTED ("unsupported operator");
if (! _cairo_operator_bounded_by_mask (op))
use_mask |= TRUE;
/* For CLEAR, cairo's rendering equation (quoting Owen's description in:
* http://lists.cairographics.org/archives/cairo/2005-August/004992.html)
* is:
* mask IN clip ? src OP dest : dest
* or more simply:
* mask IN CLIP ? 0 : dest
*
* where the ternary operator A ? B : C is (A * B) + ((1 - A) * C).
*
* The model we use in _cairo_gl_set_operator() is Render's:
* src IN mask IN clip OP dest
* which would boil down to:
* 0 (bounded by the extents of the drawing).
*
* However, we can do a Render operation using an opaque source
* and DEST_OUT to produce:
* 1 IN mask IN clip DEST_OUT dest
* which is
* mask IN clip ? 0 : dest
*/
if (op == CAIRO_OPERATOR_CLEAR) {
_cairo_pattern_init_solid (&solid_pattern, CAIRO_COLOR_WHITE,
CAIRO_CONTENT_COLOR);
source = &solid_pattern.base;
op = CAIRO_OPERATOR_DEST_OUT;
}
/* For SOURCE, cairo's rendering equation is:
* (mask IN clip) ? src OP dest : dest
* or more simply:
* (mask IN clip) ? src : dest.
*
* If we just used the Render equation, we would get:
* (src IN mask IN clip) OP dest
* or:
* (src IN mask IN clip) bounded by extents of the drawing.
*
* The trick is that for GL blending, we only get our 4 source values
* into the blender, and since we need all 4 components of source, we
* can't also get the mask IN clip into the blender. But if we did
* two passes we could make it work:
* dest = (mask IN clip) DEST_OUT dest
* dest = src IN mask IN clip ADD dest
*
* But for now, composite via an intermediate mask.
*/
if (op == CAIRO_OPERATOR_SOURCE)
use_mask |= TRUE;
/* XXX we don't need ownership of the font as we use a global
* glyph cache -- but we do need scaled_glyph eviction notification. :-(
*/
if (! _cairo_gl_surface_owns_font (dst, scaled_font))
return UNSUPPORTED ("do not control font");
/* If the glyphs overlap, we need to build an intermediate mask rather
* then perform the compositing directly.
*/
status = _cairo_scaled_font_glyph_device_extents (scaled_font,
glyphs, num_glyphs,
&extents,
&overlap);
if (unlikely (status))
return status;
use_mask |= overlap;
if (clip != NULL) {
status = _cairo_clip_get_region (clip, &clip_region);
/* the empty clip should never be propagated this far */
assert (status != CAIRO_INT_STATUS_NOTHING_TO_DO);
if (unlikely (_cairo_status_is_error (status)))
return status;
use_mask |= status == CAIRO_INT_STATUS_UNSUPPORTED;
if (! _cairo_rectangle_intersect (&extents,
_cairo_clip_get_extents (clip)))
goto EMPTY;
}
surface_extents.x = surface_extents.y = 0;
surface_extents.width = dst->width;
surface_extents.height = dst->height;
if (! _cairo_rectangle_intersect (&extents, &surface_extents))
goto EMPTY;
if (use_mask) {
return _cairo_gl_surface_show_glyphs_via_mask (dst, op,
source,
glyphs, num_glyphs,
&extents,
scaled_font,
clip,
remaining_glyphs);
}
return _render_glyphs (dst, extents.x, extents.y,
op, source,
glyphs, num_glyphs, &extents,
scaled_font, clip_region, remaining_glyphs);
EMPTY:
*remaining_glyphs = 0;
if (! _cairo_operator_bounded_by_mask (op))
return _cairo_surface_paint (&dst->base, op, source, clip);
else
return CAIRO_STATUS_SUCCESS;
}
static cairo_int_status_t
_cairo_analysis_surface_show_glyphs (void *abstract_surface,
cairo_operator_t op,
cairo_pattern_t *source,
cairo_glyph_t *glyphs,
int num_glyphs,
cairo_scaled_font_t *scaled_font,
int *remaining_glyphs)
{
cairo_analysis_surface_t *surface = abstract_surface;
cairo_status_t status, backend_status;
cairo_rectangle_int_t extents, glyph_extents;
/* Adapted from _cairo_surface_show_glyphs */
if (surface->target->backend->show_glyphs)
backend_status = (*surface->target->backend->show_glyphs) (surface->target, op,
source,
glyphs, num_glyphs,
scaled_font,
remaining_glyphs);
else if (surface->target->backend->show_text_glyphs)
backend_status = surface->target->backend->show_text_glyphs (surface->target, op,
source,
NULL, 0,
glyphs, num_glyphs,
NULL, 0,
FALSE,
scaled_font);
else
backend_status = CAIRO_INT_STATUS_UNSUPPORTED;
if (backend_status == CAIRO_INT_STATUS_ANALYZE_META_SURFACE_PATTERN)
backend_status = _analyze_meta_surface_pattern (surface, source);
status = _cairo_surface_get_extents (&surface->base, &extents);
if (status && status != CAIRO_INT_STATUS_UNSUPPORTED)
return status;
if (_cairo_operator_bounded_by_source (op)) {
cairo_rectangle_int_t source_extents;
status = _cairo_pattern_get_extents (source, &source_extents);
if (status)
return status;
_cairo_rectangle_intersect (&extents, &source_extents);
}
_cairo_rectangle_intersect (&extents, &surface->current_clip);
if (_cairo_operator_bounded_by_mask (op)) {
status = _cairo_scaled_font_glyph_device_extents (scaled_font,
glyphs,
num_glyphs,
&glyph_extents);
if (status)
return status;
_cairo_rectangle_intersect (&extents, &glyph_extents);
}
status = _add_operation (surface, &extents, backend_status);
return status;
}
