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Add and incorporate _cairo_gstate_transform_glyphs_to_backend

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After changing _cairo_gstate_show_glyphs and _cairo_gstate_glyph_path to use
this function, we see a significant speedup due to the elimination of redundant
FP calculations.
This commit is contained in:
Dan Amelang 2006-11-20 14:31:28 -08:00 • committed by Carl Worth
parent 6cfb4a01e0
commit b7cd46ddc2
1 changed files with 72 additions and 20 deletions
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92
src/cairo-gstate.c
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@ -61,6 +61,12 @@ _cairo_gstate_ensure_scaled_font (cairo_gstate_t *gstate);
static void
_cairo_gstate_unset_scaled_font (cairo_gstate_t *gstate);
static void
_cairo_gstate_transform_glyphs_to_backend (cairo_gstate_t *gstate,
const cairo_glyph_t *glyphs,
int num_glyphs,
cairo_glyph_t *transformed_glyphs);
/**
* _cairo_gstate_create:
* @target: a #cairo_surface_t, not NULL
@ -1466,7 +1472,6 @@ _cairo_gstate_show_glyphs (cairo_gstate_t *gstate,
cairo_status_t status;
cairo_pattern_union_t source_pattern;
cairo_glyph_t *transformed_glyphs;
int i;
if (gstate->source->status)
return gstate->source->status;
@ -1483,15 +1488,8 @@ _cairo_gstate_show_glyphs (cairo_gstate_t *gstate,
if (transformed_glyphs == NULL)
return CAIRO_STATUS_NO_MEMORY;
for (i = 0; i < num_glyphs; ++i)
{
transformed_glyphs[i].index = glyphs[i].index;
transformed_glyphs[i].x = glyphs[i].x + gstate->font_matrix.x0;
transformed_glyphs[i].y = glyphs[i].y + gstate->font_matrix.y0;
_cairo_gstate_user_to_backend (gstate,
&transformed_glyphs[i].x,
&transformed_glyphs[i].y);
}
_cairo_gstate_transform_glyphs_to_backend (gstate, glyphs, num_glyphs,
transformed_glyphs);
_cairo_gstate_copy_transformed_source (gstate, &source_pattern.base);
@ -1515,7 +1513,6 @@ _cairo_gstate_glyph_path (cairo_gstate_t *gstate,
cairo_path_fixed_t *path)
{
cairo_status_t status;
int i;
cairo_glyph_t *transformed_glyphs = NULL;
status = _cairo_gstate_ensure_scaled_font (gstate);
@ -1526,15 +1523,8 @@ _cairo_gstate_glyph_path (cairo_gstate_t *gstate,
if (transformed_glyphs == NULL)
return CAIRO_STATUS_NO_MEMORY;
for (i = 0; i < num_glyphs; ++i)
{
transformed_glyphs[i].index = glyphs[i].index;
transformed_glyphs[i].x = glyphs[i].x + gstate->font_matrix.x0;
transformed_glyphs[i].y = glyphs[i].y + gstate->font_matrix.y0;
_cairo_gstate_user_to_backend (gstate,
&(transformed_glyphs[i].x),
&(transformed_glyphs[i].y));
}
_cairo_gstate_transform_glyphs_to_backend (gstate, glyphs, num_glyphs,
transformed_glyphs);
status = _cairo_scaled_font_glyph_path (gstate->scaled_font,
transformed_glyphs, num_glyphs,
@ -1558,3 +1548,65 @@ _cairo_gstate_get_antialias (cairo_gstate_t *gstate)
{
return gstate->antialias;
}
/**
* _cairo_gstate_transform_glyphs_to_backend:
* @gstate: a #cairo_gstate_t
* @glyphs: the array of #cairo_glyph_t objects to be transformed
* @num_glyphs: the number of elements in @glyphs
* @transformed_glyphs: a pre-allocated array of at least @num_glyphs
* #cairo_glyph_t objects
*
* Transform an array of glyphs to backend space by first adding the offset
* of the font matrix, then transforming from user space to backend space.
* The result of the transformation is placed in @transformed_glyphs.
**/
static void
_cairo_gstate_transform_glyphs_to_backend (cairo_gstate_t *gstate,
const cairo_glyph_t *glyphs,
int num_glyphs,
cairo_glyph_t *transformed_glyphs)
{
int i;
cairo_matrix_t *ctm = &gstate->ctm;
cairo_matrix_t *device_transform = &gstate->target->device_transform;
if (_cairo_matrix_is_identity (ctm) &&
_cairo_matrix_is_identity (device_transform))
{
memcpy (transformed_glyphs, glyphs, num_glyphs * sizeof (cairo_glyph_t));
}
else if (_cairo_matrix_is_translation (ctm) &&
_cairo_matrix_is_translation (device_transform))
{
double tx = gstate->font_matrix.x0 + ctm->x0 + device_transform->x0;
double ty = gstate->font_matrix.y0 + ctm->y0 + device_transform->y0;
for (i = 0; i < num_glyphs; i++)
{
transformed_glyphs[i].index = glyphs[i].index;
transformed_glyphs[i].x = glyphs[i].x + tx;
transformed_glyphs[i].y = glyphs[i].y + ty;
}
}
else
{
cairo_matrix_t aggregate_transform;
cairo_matrix_init_translate (&aggregate_transform,
gstate->font_matrix.x0,
gstate->font_matrix.y0);
cairo_matrix_multiply (&aggregate_transform,
&aggregate_transform, ctm);
cairo_matrix_multiply (&aggregate_transform,
&aggregate_transform, device_transform);
for (i = 0; i < num_glyphs; i++)
{
transformed_glyphs[i] = glyphs[i];
cairo_matrix_transform_point (&aggregate_transform,
&transformed_glyphs[i].x,
&transformed_glyphs[i].y);
}
}
}