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8a1eca7287
The CoglPango code falls under the COGL "jurisdiction"; this means that it cannot include Clutter headers unless strictly necessary. The CoglPangoRenderer code was using the CLUTTER_NOTE() macro. Now that COGL has it's own COGL_NOTE() similar macro, CoglPango should use that and avoid including clutter-debug.h (which pulls in clutter-private.h which in turn pulls in clutter-actor.h). A new flag, COGL_DEBUG_PANGO, has been added to the COGL debug flags.
637 lines
20 KiB
C
637 lines
20 KiB
C
/*
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* Clutter.
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*
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* An OpenGL based 'interactive canvas' library.
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*
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* Authored By Matthew Allum <mallum@openedhand.com>
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*
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* Copyright (C) 2008 OpenedHand
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifndef PANGO_ENABLE_BACKEND
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#define PANGO_ENABLE_BACKEND 1
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#endif
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#include <pango/pango-fontmap.h>
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#include <pango/pangocairo.h>
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#include <pango/pango-renderer.h>
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#include <cairo.h>
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#include "cogl-pango-private.h"
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#include "cogl-pango-glyph-cache.h"
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struct _CoglPangoRenderer
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{
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PangoRenderer parent_instance;
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/* The material used to texture from the glyph cache with */
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CoglHandle glyph_material;
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/* The material used for solid fills. (boxes, rectangles + trapezoids) */
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CoglHandle solid_material;
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/* Two caches of glyphs as textures, one with mipmapped textures and
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one without */
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CoglPangoGlyphCache *glyph_cache;
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CoglPangoGlyphCache *mipmapped_glyph_cache;
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gboolean use_mipmapping;
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/* Array of rectangles to draw from the current texture */
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GArray *glyph_rectangles;
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CoglHandle glyph_texture;
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};
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struct _CoglPangoRendererClass
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{
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PangoRendererClass class_instance;
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};
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static void
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cogl_pango_renderer_glyphs_end (CoglPangoRenderer *priv)
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{
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if (priv->glyph_rectangles->len > 0)
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{
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float *rectangles = (float *) priv->glyph_rectangles->data;
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cogl_material_set_layer (priv->glyph_material, 0, priv->glyph_texture);
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cogl_set_source (priv->glyph_material);
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cogl_rectangles_with_texture_coords (rectangles,
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priv->glyph_rectangles->len / 8);
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g_array_set_size (priv->glyph_rectangles, 0);
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}
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}
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static void
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cogl_pango_renderer_draw_glyph (CoglPangoRenderer *priv,
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CoglPangoGlyphCacheValue *cache_value,
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float x1,
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float y1)
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{
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float x2, y2;
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float *p;
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if (priv->glyph_rectangles->len > 0
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&& priv->glyph_texture != cache_value->texture)
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cogl_pango_renderer_glyphs_end (priv);
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priv->glyph_texture = cache_value->texture;
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x2 = x1 + (float) cache_value->draw_width;
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y2 = y1 + (float) cache_value->draw_height;
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g_array_set_size (priv->glyph_rectangles, priv->glyph_rectangles->len + 8);
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p = &g_array_index (priv->glyph_rectangles, float,
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priv->glyph_rectangles->len - 8);
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*(p++) = x1; *(p++) = y1;
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*(p++) = x2; *(p++) = y2;
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*(p++) = cache_value->tx1; *(p++) = cache_value->ty1;
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*(p++) = cache_value->tx2; *(p++) = cache_value->ty2;
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}
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static void cogl_pango_renderer_finalize (GObject *object);
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static void cogl_pango_renderer_draw_glyphs (PangoRenderer *renderer,
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PangoFont *font,
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PangoGlyphString *glyphs,
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int x,
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int y);
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static void cogl_pango_renderer_draw_rectangle (PangoRenderer *renderer,
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PangoRenderPart part,
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int x,
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int y,
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int width,
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int height);
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static void cogl_pango_renderer_draw_trapezoid (PangoRenderer *renderer,
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PangoRenderPart part,
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double y1,
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double x11,
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double x21,
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double y2,
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double x12,
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double x22);
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G_DEFINE_TYPE (CoglPangoRenderer, cogl_pango_renderer, PANGO_TYPE_RENDERER);
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static void
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cogl_pango_renderer_init (CoglPangoRenderer *priv)
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{
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priv->glyph_material = cogl_material_new ();
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/* The default combine mode of materials is to modulate (A x B) the texture
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* RGBA channels with the RGBA channels of the previous layer (which in our
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* case is just the solid font color)
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*
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* Since our glyph cache textures are component alpha textures, and so the
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* RGB channels are defined as (0, 0, 0) we don't want to modulate the RGB
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* channels, instead we want to simply replace them with our solid font
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* color...
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*
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* XXX: we could really do with a neat string based way for describing
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* combine modes, like: "REPLACE(PREVIOUS[RGB])"
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* XXX: potentially materials could have a fuzzy default combine mode
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* such that they default to this for component alpha textures? This would
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* give the same semantics as the old-style GL_MODULATE mode but sounds a
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* bit hacky.
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*/
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cogl_material_set_layer_combine_function (
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priv->glyph_material,
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0, /* layer */
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COGL_MATERIAL_LAYER_COMBINE_CHANNELS_RGB,
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COGL_MATERIAL_LAYER_COMBINE_FUNC_REPLACE);
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cogl_material_set_layer_combine_arg_src (
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priv->glyph_material,
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0, /* layer */
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0, /* arg */
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COGL_MATERIAL_LAYER_COMBINE_CHANNELS_RGB,
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COGL_MATERIAL_LAYER_COMBINE_SRC_PREVIOUS);
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priv->solid_material = cogl_material_new ();
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priv->glyph_cache = cogl_pango_glyph_cache_new (FALSE);
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priv->mipmapped_glyph_cache = cogl_pango_glyph_cache_new (TRUE);
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priv->use_mipmapping = FALSE;
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priv->glyph_rectangles = g_array_new (FALSE, FALSE, sizeof (float));
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}
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static void
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cogl_pango_renderer_class_init (CoglPangoRendererClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (klass);
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object_class->finalize = cogl_pango_renderer_finalize;
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renderer_class->draw_glyphs = cogl_pango_renderer_draw_glyphs;
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renderer_class->draw_rectangle = cogl_pango_renderer_draw_rectangle;
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renderer_class->draw_trapezoid = cogl_pango_renderer_draw_trapezoid;
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}
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static void
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cogl_pango_renderer_finalize (GObject *object)
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{
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CoglPangoRenderer *priv = COGL_PANGO_RENDERER (object);
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cogl_pango_glyph_cache_free (priv->mipmapped_glyph_cache);
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cogl_pango_glyph_cache_free (priv->glyph_cache);
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g_array_free (priv->glyph_rectangles, TRUE);
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G_OBJECT_CLASS (cogl_pango_renderer_parent_class)->finalize (object);
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}
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static CoglPangoRenderer *
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cogl_pango_get_renderer_from_context (PangoContext *context)
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{
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PangoFontMap *font_map;
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PangoRenderer *renderer;
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CoglPangoFontMap *font_map_priv;
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font_map = pango_context_get_font_map (context);
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g_return_val_if_fail (COGL_PANGO_IS_FONT_MAP (font_map), NULL);
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font_map_priv = COGL_PANGO_FONT_MAP (font_map);
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renderer = cogl_pango_font_map_get_renderer (font_map_priv);
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g_return_val_if_fail (COGL_PANGO_IS_RENDERER (renderer), NULL);
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return COGL_PANGO_RENDERER (renderer);
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}
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/**
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* cogl_pango_render_layout_subpixel:
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* @layout: a #PangoLayout
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* @x: FIXME
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* @y: FIXME
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* @color: color to use when rendering the layout
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* @flags: flags to pass to the renderer
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*
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* FIXME
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*
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* Since: 1.0
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*/
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void
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cogl_pango_render_layout_subpixel (PangoLayout *layout,
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int x,
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int y,
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const CoglColor *color,
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int flags)
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{
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PangoContext *context;
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CoglPangoRenderer *priv;
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context = pango_layout_get_context (layout);
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priv = cogl_pango_get_renderer_from_context (context);
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if (G_UNLIKELY (!priv))
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return;
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cogl_material_set_color (priv->glyph_material, color);
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cogl_material_set_color (priv->solid_material, color);
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pango_renderer_draw_layout (PANGO_RENDERER (priv), layout, x, y);
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}
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/**
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* cogl_pango_render_layout:
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* @layout: a #PangoLayout
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* @x: X coordinate to render the layout at
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* @y: Y coordinate to render the layout at
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* @color: color to use when rendering the layout
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* @flags: flags to pass to the renderer
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*
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* Renders @layout.
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*
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* Since: 1.0
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*/
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void
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cogl_pango_render_layout (PangoLayout *layout,
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int x,
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int y,
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const CoglColor *color,
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int flags)
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{
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cogl_pango_render_layout_subpixel (layout,
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x * PANGO_SCALE,
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y * PANGO_SCALE,
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color,
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flags);
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}
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/**
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* cogl_pango_render_layout_line:
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* @line: a #PangoLayoutLine
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* @x: X coordinate to render the line at
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* @y: Y coordinate to render the line at
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* @color: color to use when rendering the line
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*
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* Renders @line at the given coordinates using the given color.
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*
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* Since: 1.0
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*/
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void
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cogl_pango_render_layout_line (PangoLayoutLine *line,
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int x,
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int y,
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const CoglColor *color)
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{
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PangoContext *context;
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CoglPangoRenderer *priv;
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context = pango_layout_get_context (line->layout);
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priv = cogl_pango_get_renderer_from_context (context);
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if (G_UNLIKELY (!priv))
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return;
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cogl_material_set_color (priv->glyph_material, color);
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cogl_material_set_color (priv->solid_material, color);
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pango_renderer_draw_layout_line (PANGO_RENDERER (priv), line, x, y);
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}
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void
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_cogl_pango_renderer_clear_glyph_cache (CoglPangoRenderer *renderer)
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{
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cogl_pango_glyph_cache_clear (renderer->glyph_cache);
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cogl_pango_glyph_cache_clear (renderer->mipmapped_glyph_cache);
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}
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void
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_cogl_pango_renderer_set_use_mipmapping (CoglPangoRenderer *renderer,
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gboolean value)
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{
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renderer->use_mipmapping = value;
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}
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gboolean
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_cogl_pango_renderer_get_use_mipmapping (CoglPangoRenderer *renderer)
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{
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return renderer->use_mipmapping;
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}
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static CoglPangoGlyphCacheValue *
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cogl_pango_renderer_get_cached_glyph (PangoRenderer *renderer,
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PangoFont *font,
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PangoGlyph glyph)
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{
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CoglPangoRenderer *priv = COGL_PANGO_RENDERER (renderer);
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CoglPangoGlyphCacheValue *value;
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CoglPangoGlyphCache *glyph_cache;
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glyph_cache = priv->use_mipmapping ? priv->mipmapped_glyph_cache
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: priv->glyph_cache;
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value = cogl_pango_glyph_cache_lookup (glyph_cache, font, glyph);
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if (value == NULL)
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{
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cairo_surface_t *surface;
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cairo_t *cr;
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cairo_scaled_font_t *scaled_font;
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PangoRectangle ink_rect;
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cairo_glyph_t cairo_glyph;
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pango_font_get_glyph_extents (font, glyph, &ink_rect, NULL);
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pango_extents_to_pixels (&ink_rect, NULL);
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surface = cairo_image_surface_create (CAIRO_FORMAT_A8,
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ink_rect.width,
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ink_rect.height);
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cr = cairo_create (surface);
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scaled_font = pango_cairo_font_get_scaled_font (PANGO_CAIRO_FONT (font));
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cairo_set_scaled_font (cr, scaled_font);
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cairo_glyph.x = -ink_rect.x;
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cairo_glyph.y = -ink_rect.y;
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/* The PangoCairo glyph numbers directly map to Cairo glyph
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numbers */
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cairo_glyph.index = glyph;
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cairo_show_glyphs (cr, &cairo_glyph, 1);
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cairo_destroy (cr);
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cairo_surface_flush (surface);
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/* Copy the glyph to the cache */
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value =
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cogl_pango_glyph_cache_set (glyph_cache, font, glyph,
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cairo_image_surface_get_data (surface),
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cairo_image_surface_get_width (surface),
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cairo_image_surface_get_height (surface),
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cairo_image_surface_get_stride (surface),
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ink_rect.x, ink_rect.y);
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cairo_surface_destroy (surface);
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COGL_NOTE (PANGO, "cache fail %i", glyph);
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}
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else
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COGL_NOTE (PANGO, "cache success %i", glyph);
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return value;
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}
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void
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cogl_pango_ensure_glyph_cache_for_layout (PangoLayout *layout)
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{
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PangoContext *context;
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PangoRenderer *renderer;
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PangoLayoutIter *iter;
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g_return_if_fail (PANGO_IS_LAYOUT (layout));
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if ((iter = pango_layout_get_iter (layout)) == NULL)
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return;
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context = pango_layout_get_context (layout);
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renderer =
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PANGO_RENDERER (cogl_pango_get_renderer_from_context (context));
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do
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{
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PangoLayoutLine *line;
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GSList *l;
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line = pango_layout_iter_get_line_readonly (iter);
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for (l = line->runs; l; l = l->next)
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{
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PangoLayoutRun *run = l->data;
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PangoGlyphString *glyphs = run->glyphs;
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int i;
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for (i = 0; i < glyphs->num_glyphs; i++)
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{
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PangoGlyphInfo *gi = &glyphs->glyphs[i];
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cogl_pango_renderer_get_cached_glyph (renderer,
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run->item->analysis.font,
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gi->glyph);
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}
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}
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}
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while (pango_layout_iter_next_line (iter));
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pango_layout_iter_free (iter);
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}
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static void
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cogl_pango_renderer_set_color_for_part (PangoRenderer *renderer,
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PangoRenderPart part)
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{
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PangoColor *pango_color = pango_renderer_get_color (renderer, part);
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CoglPangoRenderer *priv = COGL_PANGO_RENDERER (renderer);
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if (pango_color)
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{
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CoglColor color;
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guint8 red = pango_color->red >> 8;
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guint8 green = pango_color->green >> 8;
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guint8 blue = pango_color->blue >> 8;
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guint8 alpha;
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cogl_material_get_color (priv->solid_material, &color);
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alpha = cogl_color_get_alpha_byte (&color);
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cogl_material_set_color4ub (priv->solid_material,
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red, green, blue, alpha);
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cogl_material_set_color4ub (priv->glyph_material,
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red, green, blue, alpha);
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}
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}
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static void
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cogl_pango_renderer_draw_box (PangoRenderer *renderer,
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int x,
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int y,
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int width,
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int height)
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{
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CoglPangoRenderer *priv = COGL_PANGO_RENDERER (renderer);
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cogl_set_source (priv->solid_material);
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cogl_path_rectangle ((float)(x),
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(float)(y - height),
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(float)(width),
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(float)(height));
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cogl_path_stroke ();
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}
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static void
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cogl_pango_renderer_get_device_units (PangoRenderer *renderer,
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int xin,
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int yin,
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float *xout,
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float *yout)
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{
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const PangoMatrix *matrix;
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if ((matrix = pango_renderer_get_matrix (renderer)))
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{
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/* Convert user-space coords to device coords */
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*xout = ((xin * matrix->xx + yin * matrix->xy)
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/ PANGO_SCALE + matrix->x0);
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*yout = ((yin * matrix->yy + xin * matrix->yx)
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/ PANGO_SCALE + matrix->y0);
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}
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else
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{
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*xout = PANGO_PIXELS (xin);
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*yout = PANGO_PIXELS (yin);
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}
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}
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static void
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cogl_pango_renderer_draw_rectangle (PangoRenderer *renderer,
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PangoRenderPart part,
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int x,
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int y,
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int width,
|
|
int height)
|
|
{
|
|
CoglPangoRenderer *priv = COGL_PANGO_RENDERER (renderer);
|
|
float 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_set_source (priv->solid_material);
|
|
cogl_rectangle (x1, y1, x2, y2);
|
|
}
|
|
|
|
static void
|
|
cogl_pango_renderer_draw_trapezoid (PangoRenderer *renderer,
|
|
PangoRenderPart part,
|
|
double y1,
|
|
double x11,
|
|
double x21,
|
|
double y2,
|
|
double x12,
|
|
double x22)
|
|
{
|
|
CoglPangoRenderer *priv = COGL_PANGO_RENDERER (renderer);
|
|
float points[8];
|
|
|
|
points[0] = (x11);
|
|
points[1] = (y1);
|
|
points[2] = (x12);
|
|
points[3] = (y2);
|
|
points[4] = (x22);
|
|
points[5] = points[3];
|
|
points[6] = (x21);
|
|
points[7] = points[1];
|
|
|
|
cogl_pango_renderer_set_color_for_part (renderer, part);
|
|
|
|
cogl_set_source (priv->solid_material);
|
|
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)
|
|
{
|
|
CoglPangoRenderer *priv = (CoglPangoRenderer *) renderer;
|
|
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;
|
|
float 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;
|
|
|
|
cogl_pango_renderer_glyphs_end (priv);
|
|
|
|
if (font == NULL ||
|
|
(metrics = pango_font_get_metrics (font, NULL)) == NULL)
|
|
{
|
|
cogl_pango_renderer_draw_box (renderer,
|
|
x,
|
|
y,
|
|
PANGO_UNKNOWN_GLYPH_WIDTH,
|
|
PANGO_UNKNOWN_GLYPH_HEIGHT);
|
|
}
|
|
else
|
|
{
|
|
cogl_pango_renderer_draw_box (renderer,
|
|
x,
|
|
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_glyphs_end (priv);
|
|
|
|
cogl_pango_renderer_draw_box (renderer,
|
|
x,
|
|
y,
|
|
PANGO_UNKNOWN_GLYPH_WIDTH,
|
|
PANGO_UNKNOWN_GLYPH_HEIGHT);
|
|
}
|
|
else
|
|
{
|
|
float width, height;
|
|
|
|
x += (float)(cache_value->draw_x);
|
|
y += (float)(cache_value->draw_y);
|
|
|
|
width = x + (float)(cache_value->draw_width);
|
|
height = y + (float)(cache_value->draw_height);
|
|
|
|
cogl_pango_renderer_draw_glyph (priv, cache_value, x, y);
|
|
}
|
|
}
|
|
|
|
xi += gi->geometry.width;
|
|
}
|
|
|
|
cogl_pango_renderer_glyphs_end (priv);
|
|
}
|