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mutter/clutter/pango/cogl-pango-render.c
Emmanuele Bassi b5cc7a4044 2008-10-30 Emmanuele Bassi <ebassi@linux.intel.com> 
Bug 1215 - Move the Pango renderer to the public API

	* clutter/pango/*: Rename PangoClutter -> CoglPango.

	* clutter/Makefile.am:
	* clutter/clutter-backend.c:
	* clutter/clutter-entry.c:
	* clutter/clutter-label.c:
	* clutter/clutter-main.[ch]:
	* clutter/clutter-private.h: Update the users of the Pango
	renderer API.

	* README: Update release notes.
2008-10-30 17:11:29 +00:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By Matthew Allum <mallum@openedhand.com>
*
* Copyright (C) 2008 OpenedHand
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifndef PANGO_ENABLE_BACKEND
#define PANGO_ENABLE_BACKEND 1
#endif
#include <pango/pango-fontmap.h>
#include <pango/pangocairo.h>
#include <pango/pango-renderer.h>
#include <cairo.h>
#include "cogl-pango-private.h"
#include "cogl-pango-glyph-cache.h"
#include "../clutter-debug.h"
struct _CoglPangoRenderer
{
PangoRenderer parent_instance;
/* The color to draw the glyphs with */
CoglColor color;
/* Two caches of glyphs as textures, one with mipmapped textures and
one without */
CoglPangoGlyphCache *glyph_cache;
CoglPangoGlyphCache *mipmapped_glyph_cache;
gboolean use_mipmapping;
};
struct _CoglPangoRendererClass
{
PangoRendererClass class_instance;
};
#define COGL_PANGO_UNIT_TO_FIXED(x) ((x) << (COGL_FIXED_Q - 10))
static void cogl_pango_renderer_finalize (GObject *object);
static void cogl_pango_renderer_draw_glyphs (PangoRenderer *renderer,
PangoFont *font,
PangoGlyphString *glyphs,
int x,
int y);
static void cogl_pango_renderer_draw_rectangle (PangoRenderer *renderer,
PangoRenderPart part,
int x,
int y,
int width,
int height);
static void cogl_pango_renderer_draw_trapezoid (PangoRenderer *renderer,
PangoRenderPart part,
double y1,
double x11,
double x21,
double y2,
double x12,
double x22);
static GObjectClass *parent_class = NULL;
G_DEFINE_TYPE (CoglPangoRenderer, cogl_pango_renderer,
PANGO_TYPE_RENDERER);
static void
cogl_pango_renderer_init (CoglPangoRenderer *priv)
{
priv->glyph_cache = cogl_pango_glyph_cache_new (FALSE);
priv->mipmapped_glyph_cache = cogl_pango_glyph_cache_new (TRUE);
priv->use_mipmapping = FALSE;
}
static void
cogl_pango_renderer_class_init (CoglPangoRendererClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
object_class->finalize = cogl_pango_renderer_finalize;
renderer_class->draw_glyphs = cogl_pango_renderer_draw_glyphs;
renderer_class->draw_rectangle = cogl_pango_renderer_draw_rectangle;
renderer_class->draw_trapezoid = cogl_pango_renderer_draw_trapezoid;
}
static void
cogl_pango_renderer_finalize (GObject *object)
{
CoglPangoRenderer *priv = COGL_PANGO_RENDERER (object);
cogl_pango_glyph_cache_free (priv->mipmapped_glyph_cache);
cogl_pango_glyph_cache_free (priv->glyph_cache);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
void
cogl_pango_render_layout_subpixel (PangoLayout *layout,
int x,
int y,
const CoglColor *color,
int flags)
{
PangoContext *context;
PangoFontMap *font_map;
PangoRenderer *renderer;
CoglPangoRenderer *priv;
context = pango_layout_get_context (layout);
font_map = pango_context_get_font_map (context);
g_return_if_fail (COGL_PANGO_IS_FONT_MAP (font_map));
renderer = cogl_pango_font_map_get_renderer
(COGL_PANGO_FONT_MAP (font_map));
priv = COGL_PANGO_RENDERER (renderer);
priv->color = *color;
pango_renderer_draw_layout (renderer, layout, x, y);
}
void
cogl_pango_render_layout (PangoLayout *layout,
int x,
int y,
const CoglColor *color,
int flags)
{
cogl_pango_render_layout_subpixel (layout,
x * PANGO_SCALE,
y * PANGO_SCALE,
color,
flags);
}
void
cogl_pango_render_layout_line (PangoLayoutLine *line,
int x,
int y,
const CoglColor *color)
{
PangoContext *context;
PangoFontMap *font_map;
PangoRenderer *renderer;
CoglPangoRenderer *priv;
context = pango_layout_get_context (line->layout);
font_map = pango_context_get_font_map (context);
g_return_if_fail (COGL_PANGO_IS_FONT_MAP (font_map));
renderer = cogl_pango_font_map_get_renderer
(COGL_PANGO_FONT_MAP (font_map));
priv = COGL_PANGO_RENDERER (renderer);
priv->color = *color;
pango_renderer_draw_layout_line (renderer, line, x, y);
}
void
_cogl_pango_renderer_clear_glyph_cache (CoglPangoRenderer *renderer)
{
cogl_pango_glyph_cache_clear (renderer->glyph_cache);
cogl_pango_glyph_cache_clear (renderer->mipmapped_glyph_cache);
}
void
_cogl_pango_renderer_set_use_mipmapping (CoglPangoRenderer *renderer,
gboolean value)
{
renderer->use_mipmapping = value;
}
gboolean
_cogl_pango_renderer_get_use_mipmapping (CoglPangoRenderer *renderer)
{
return renderer->use_mipmapping;
}
static CoglPangoGlyphCacheValue *
cogl_pango_renderer_get_cached_glyph (PangoRenderer *renderer,
PangoFont *font,
PangoGlyph glyph)
{
CoglPangoRenderer *priv = COGL_PANGO_RENDERER (renderer);
CoglPangoGlyphCacheValue *value;
CoglPangoGlyphCache *glyph_cache;
glyph_cache = priv->use_mipmapping
? priv->mipmapped_glyph_cache : priv->glyph_cache;
if ((value = cogl_pango_glyph_cache_lookup (glyph_cache,
font,
glyph)) == NULL)
{
cairo_surface_t *surface;
cairo_t *cr;
cairo_scaled_font_t *scaled_font;
PangoRectangle ink_rect;
cairo_glyph_t cairo_glyph;
pango_font_get_glyph_extents (font, glyph, &ink_rect, NULL);
pango_extents_to_pixels (&ink_rect, NULL);
surface = cairo_image_surface_create (CAIRO_FORMAT_A8,
ink_rect.width,
ink_rect.height);
cr = cairo_create (surface);
scaled_font = pango_cairo_font_get_scaled_font (PANGO_CAIRO_FONT (font));
cairo_set_scaled_font (cr, scaled_font);
cairo_glyph.x = -ink_rect.x;
cairo_glyph.y = -ink_rect.y;
/* The PangoCairo glyph numbers directly map to Cairo glyph
numbers */
cairo_glyph.index = glyph;
cairo_show_glyphs (cr, &cairo_glyph, 1);
cairo_destroy (cr);
cairo_surface_flush (surface);
/* Copy the glyph to the cache */
value = cogl_pango_glyph_cache_set
(glyph_cache, font, glyph,
cairo_image_surface_get_data (surface),
cairo_image_surface_get_width (surface),
cairo_image_surface_get_height (surface),
cairo_image_surface_get_stride (surface),
ink_rect.x, ink_rect.y);
cairo_surface_destroy (surface);
CLUTTER_NOTE (PANGO, "cache fail %i", glyph);
}
else
CLUTTER_NOTE (PANGO, "cache success %i", glyph);
return value;
}
void
cogl_pango_ensure_glyph_cache_for_layout (PangoLayout *layout)
{
PangoContext *context;
PangoFontMap *fontmap;
PangoRenderer *renderer;
PangoLayoutIter *iter;
g_return_if_fail (PANGO_IS_LAYOUT (layout));
context = pango_layout_get_context (layout);
fontmap = pango_context_get_font_map (context);
g_return_if_fail (COGL_PANGO_IS_FONT_MAP (fontmap));
renderer = cogl_pango_font_map_get_renderer
(COGL_PANGO_FONT_MAP (fontmap));
if ((iter = pango_layout_get_iter (layout)) == NULL)
return;
do
{
PangoLayoutLine *line;
GSList *l;
line = pango_layout_iter_get_line_readonly (iter);
for (l = line->runs; l; l = l->next)
{
PangoLayoutRun *run = l->data;
PangoGlyphString *glyphs = run->glyphs;
int i;
for (i = 0; i < glyphs->num_glyphs; i++)
{
PangoGlyphInfo *gi = &glyphs->glyphs[i];
cogl_pango_renderer_get_cached_glyph (renderer,
run->item->analysis.font,
gi->glyph);
}
}
}
while (pango_layout_iter_next_line (iter));
pango_layout_iter_free (iter);
}
static void
cogl_pango_renderer_set_color_for_part (PangoRenderer *renderer,
PangoRenderPart part)
{
PangoColor *pango_color = pango_renderer_get_color (renderer, part);
CoglPangoRenderer *priv = COGL_PANGO_RENDERER (renderer);
CoglColor color;
if (pango_color)
{
cogl_color_set_from_4ub (&color,
pango_color->red >> 8,
pango_color->green >> 8,
pango_color->blue >> 8,
cogl_color_get_alpha_byte (&priv->color));
}
else
color = priv->color;
cogl_color (&color);
}
static void
cogl_pango_renderer_draw_box (int x, int y,
int width, int height)
{
cogl_path_rectangle (COGL_FIXED_FROM_INT (x),
COGL_FIXED_FROM_INT (y - height),
COGL_FIXED_FROM_INT (width),
COGL_FIXED_FROM_INT (height));
cogl_path_stroke ();
}
static void
cogl_pango_renderer_get_device_units (PangoRenderer *renderer,
int xin,
int yin,
CoglFixed *xout,
CoglFixed *yout)
{
const PangoMatrix *matrix;
if ((matrix = pango_renderer_get_matrix (renderer)))
{
/* Convert user-space coords to device coords */
*xout = COGL_FIXED_FROM_FLOAT ((xin * matrix->xx + yin * matrix->xy)
/ PANGO_SCALE + matrix->x0);
*yout = COGL_FIXED_FROM_FLOAT ((yin * matrix->yy + xin * matrix->yx)
/ PANGO_SCALE + matrix->y0);
}
else
{
*xout = COGL_PANGO_UNIT_TO_FIXED (xin);
*yout = COGL_PANGO_UNIT_TO_FIXED (yin);
}
}
static void
cogl_pango_renderer_draw_rectangle (PangoRenderer *renderer,
PangoRenderPart part,
int x,
int y,
int width,
int height)
{
CoglFixed x1, x2, y1, y2;
cogl_pango_renderer_set_color_for_part (renderer, part);
cogl_pango_renderer_get_device_units (renderer, x, y,
&x1, &y1);
cogl_pango_renderer_get_device_units (renderer, x + width, y + height,
&x2, &y2);
cogl_rectanglex (x1, y1, x2 - x1, y2 - y1);
}
static void
cogl_pango_renderer_draw_trapezoid (PangoRenderer *renderer,
PangoRenderPart part,
double y1,
double x11,
double x21,
double y2,
double x12,
double x22)
{
CoglFixed points[8];
points[0] = COGL_FIXED_FROM_FLOAT (x11);
points[1] = COGL_FIXED_FROM_FLOAT (y1);
points[2] = COGL_FIXED_FROM_FLOAT (x12);
points[3] = COGL_FIXED_FROM_FLOAT (y2);
points[4] = COGL_FIXED_FROM_FLOAT (x22);
points[5] = points[3];
points[6] = COGL_FIXED_FROM_FLOAT (x21);
points[7] = points[1];
cogl_pango_renderer_set_color_for_part (renderer, part);
cogl_path_polygon (points, 4);
cogl_path_fill ();
}
static void
cogl_pango_renderer_draw_glyphs (PangoRenderer *renderer,
PangoFont *font,
PangoGlyphString *glyphs,
int xi,
int yi)
{
CoglPangoGlyphCacheValue *cache_value;
int i;
cogl_pango_renderer_set_color_for_part (renderer,
PANGO_RENDER_PART_FOREGROUND);
for (i = 0; i < glyphs->num_glyphs; i++)
{
PangoGlyphInfo *gi = glyphs->glyphs + i;
CoglFixed x, y;
cogl_pango_renderer_get_device_units (renderer,
xi + gi->geometry.x_offset,
yi + gi->geometry.y_offset,
&x, &y);
if ((gi->glyph & PANGO_GLYPH_UNKNOWN_FLAG))
{
PangoFontMetrics *metrics;
if (font == NULL ||
(metrics = pango_font_get_metrics (font, NULL)) == NULL)
{
cogl_pango_renderer_draw_box (COGL_FIXED_TO_INT (x),
COGL_FIXED_TO_INT (y),
PANGO_UNKNOWN_GLYPH_WIDTH,
PANGO_UNKNOWN_GLYPH_HEIGHT);
}
else
{
cogl_pango_renderer_draw_box (COGL_FIXED_TO_INT (x),
COGL_FIXED_TO_INT (y),
metrics->approximate_char_width
/ PANGO_SCALE,
metrics->ascent / PANGO_SCALE);
pango_font_metrics_unref (metrics);
}
}
else
{
/* Get the texture containing the glyph. This will create
the cache entry if there isn't already one */
cache_value =
cogl_pango_renderer_get_cached_glyph (renderer,
font,
gi->glyph);
if (cache_value == NULL)
cogl_pango_renderer_draw_box (COGL_FIXED_TO_INT (x),
COGL_FIXED_TO_INT (y),
PANGO_UNKNOWN_GLYPH_WIDTH,
PANGO_UNKNOWN_GLYPH_HEIGHT);
else
{
CoglFixed width, height;
x += COGL_FIXED_FROM_INT (cache_value->draw_x);
y += COGL_FIXED_FROM_INT (cache_value->draw_y);
width = x + COGL_FIXED_FROM_INT (cache_value->draw_width);
height = y + COGL_FIXED_FROM_INT (cache_value->draw_height);
/* Render the glyph from the texture */
cogl_texture_rectangle (cache_value->texture,
x, y,
width, height,
cache_value->tx1, cache_value->ty1,
cache_value->tx2, cache_value->ty2);
}
}
xi += gi->geometry.width;
}
}
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