/* * Clutter. * * An OpenGL based 'interactive canvas' library. * * Authored By Matthew Allum * * 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 . */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #ifndef PANGO_ENABLE_BACKEND #define PANGO_ENABLE_BACKEND 1 #endif #include #include #include #include #include "cogl-pango-private.h" #include "cogl-pango-glyph-cache.h" #include "cogl-pango-display-list.h" struct _CoglPangoRenderer { PangoRenderer parent_instance; /* The material used to texture from the glyph cache with */ CoglHandle glyph_material; /* The material used for solid fills. (boxes, rectangles + trapezoids) */ CoglHandle solid_material; /* Caches of glyphs as textures */ CoglPangoGlyphCache *glyph_cache; /* The current display list that is being built */ CoglPangoDisplayList *display_list; }; struct _CoglPangoRendererClass { PangoRendererClass class_instance; }; typedef struct _CoglPangoRendererQdata CoglPangoRendererQdata; /* An instance of this struct gets attached to each PangoLayout to cache the VBO and to detect changes to the layout */ struct _CoglPangoRendererQdata { /* The cache of the geometry for the layout */ CoglPangoDisplayList *display_list; /* A reference to the first line of the layout. This is just used to detect changes */ PangoLayoutLine *first_line; }; static void cogl_pango_renderer_draw_glyph (CoglPangoRenderer *priv, CoglPangoGlyphCacheValue *cache_value, float x1, float y1) { float x2, y2; g_return_if_fail (priv->display_list != NULL); x2 = x1 + (float) cache_value->draw_width; y2 = y1 + (float) cache_value->draw_height; _cogl_pango_display_list_add_texture (priv->display_list, cache_value->texture, x1, y1, x2, y2, cache_value->tx1, cache_value->ty1, cache_value->tx2, cache_value->ty2); } 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); G_DEFINE_TYPE (CoglPangoRenderer, cogl_pango_renderer, PANGO_TYPE_RENDERER); static void cogl_pango_renderer_init (CoglPangoRenderer *priv) { priv->glyph_material = cogl_material_new (); /* The default combine mode of materials is to modulate (A x B) the texture * RGBA channels with the RGBA channels of the previous layer (which in our * case is just the font color) * * Since the RGB for an alpha texture is defined as 0, this gives us: * * result.rgb = color.rgb * 0 * result.a = color.a * texture.a * * What we want is premultiplied rgba values: * * result.rgba = color.rgb * texture.a * result.a = color.a * texture.a */ cogl_material_set_layer_combine (priv->glyph_material, 0, /* layer */ "RGBA = MODULATE (PREVIOUS, TEXTURE[A])", NULL); priv->solid_material = cogl_material_new (); priv->glyph_cache = cogl_pango_glyph_cache_new (); _cogl_pango_renderer_set_use_mipmapping (priv, FALSE); } static void cogl_pango_renderer_class_init (CoglPangoRendererClass *klass) { GObjectClass *object_class = G_OBJECT_CLASS (klass); PangoRendererClass *renderer_class = PANGO_RENDERER_CLASS (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->glyph_cache); G_OBJECT_CLASS (cogl_pango_renderer_parent_class)->finalize (object); } static CoglPangoRenderer * cogl_pango_get_renderer_from_context (PangoContext *context) { PangoFontMap *font_map; PangoRenderer *renderer; CoglPangoFontMap *font_map_priv; font_map = pango_context_get_font_map (context); g_return_val_if_fail (COGL_PANGO_IS_FONT_MAP (font_map), NULL); font_map_priv = COGL_PANGO_FONT_MAP (font_map); renderer = cogl_pango_font_map_get_renderer (font_map_priv); g_return_val_if_fail (COGL_PANGO_IS_RENDERER (renderer), NULL); return COGL_PANGO_RENDERER (renderer); } static GQuark cogl_pango_render_get_qdata_key (void) { static GQuark key = 0; if (G_UNLIKELY (key == 0)) key = g_quark_from_static_string ("CoglPangoDisplayList"); return key; } static void cogl_pango_render_qdata_destroy (CoglPangoRendererQdata *qdata) { if (qdata->display_list) _cogl_pango_display_list_free (qdata->display_list); if (qdata->first_line) pango_layout_line_unref (qdata->first_line); g_slice_free (CoglPangoRendererQdata, qdata); } /** * cogl_pango_render_layout_subpixel: * @layout: a #PangoLayout * @x: FIXME * @y: FIXME * @color: color to use when rendering the layout * @flags: flags to pass to the renderer * * FIXME * * Since: 1.0 */ void cogl_pango_render_layout_subpixel (PangoLayout *layout, int x, int y, const CoglColor *color, int flags) { PangoContext *context; CoglPangoRenderer *priv; CoglPangoRendererQdata *qdata; context = pango_layout_get_context (layout); priv = cogl_pango_get_renderer_from_context (context); if (G_UNLIKELY (!priv)) return; qdata = g_object_get_qdata (G_OBJECT (layout), cogl_pango_render_get_qdata_key ()); if (qdata == NULL) { qdata = g_slice_new0 (CoglPangoRendererQdata); g_object_set_qdata_full (G_OBJECT (layout), cogl_pango_render_get_qdata_key (), qdata, (GDestroyNotify) cogl_pango_render_qdata_destroy); } /* Check if the layout has changed since the last build of the display list. This trick was suggested by Behdad Esfahbod here: http://mail.gnome.org/archives/gtk-i18n-list/2009-May/msg00019.html */ if (qdata->display_list && qdata->first_line && qdata->first_line->layout != layout) { _cogl_pango_display_list_free (qdata->display_list); qdata->display_list = NULL; } if (qdata->display_list == NULL) { qdata->display_list = _cogl_pango_display_list_new (); priv->display_list = qdata->display_list; pango_renderer_draw_layout (PANGO_RENDERER (priv), layout, 0, 0); priv->display_list = NULL; } cogl_push_matrix (); cogl_translate (x / (gfloat) PANGO_SCALE, y / (gfloat) PANGO_SCALE, 0); _cogl_pango_display_list_render (qdata->display_list, color, priv->glyph_material, priv->solid_material); cogl_pop_matrix (); /* Keep a reference to the first line of the layout so we can detect changes */ if (qdata->first_line) { pango_layout_line_unref (qdata->first_line); qdata->first_line = NULL; } if (pango_layout_get_line_count (layout) > 0) { qdata->first_line = pango_layout_get_line (layout, 0); pango_layout_line_ref (qdata->first_line); } } /** * cogl_pango_render_layout: * @layout: a #PangoLayout * @x: X coordinate to render the layout at * @y: Y coordinate to render the layout at * @color: color to use when rendering the layout * @flags: flags to pass to the renderer * * Renders @layout. * * Since: 1.0 */ 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); } /** * cogl_pango_render_layout_line: * @line: a #PangoLayoutLine * @x: X coordinate to render the line at * @y: Y coordinate to render the line at * @color: color to use when rendering the line * * Renders @line at the given coordinates using the given color. * * Since: 1.0 */ void cogl_pango_render_layout_line (PangoLayoutLine *line, int x, int y, const CoglColor *color) { PangoContext *context; CoglPangoRenderer *priv; context = pango_layout_get_context (line->layout); priv = cogl_pango_get_renderer_from_context (context); if (G_UNLIKELY (!priv)) return; priv->display_list = _cogl_pango_display_list_new (); pango_renderer_draw_layout_line (PANGO_RENDERER (priv), line, x, y); _cogl_pango_display_list_render (priv->display_list, color, priv->glyph_material, priv->solid_material); _cogl_pango_display_list_free (priv->display_list); priv->display_list = NULL; } void _cogl_pango_renderer_clear_glyph_cache (CoglPangoRenderer *renderer) { cogl_pango_glyph_cache_clear (renderer->glyph_cache); } void _cogl_pango_renderer_set_use_mipmapping (CoglPangoRenderer *renderer, gboolean value) { if (value) cogl_material_set_layer_filters (renderer->glyph_material, 0, COGL_MATERIAL_FILTER_LINEAR_MIPMAP_LINEAR, COGL_MATERIAL_FILTER_LINEAR); else cogl_material_set_layer_filters (renderer->glyph_material, 0, COGL_MATERIAL_FILTER_LINEAR, COGL_MATERIAL_FILTER_LINEAR); } gboolean _cogl_pango_renderer_get_use_mipmapping (CoglPangoRenderer *renderer) { const GList *layers = cogl_material_get_layers (renderer->glyph_material); g_return_val_if_fail (layers != NULL, FALSE); return (cogl_material_layer_get_min_filter (layers->data) == COGL_MATERIAL_FILTER_LINEAR_MIPMAP_LINEAR); } static CoglPangoGlyphCacheValue * cogl_pango_renderer_get_cached_glyph (PangoRenderer *renderer, PangoFont *font, PangoGlyph glyph) { CoglPangoRenderer *priv = COGL_PANGO_RENDERER (renderer); CoglPangoGlyphCacheValue *value; value = cogl_pango_glyph_cache_lookup (priv->glyph_cache, font, glyph); if (value == 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 (priv->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); COGL_NOTE (PANGO, "cache fail %i", glyph); } else COGL_NOTE (PANGO, "cache success %i", glyph); return value; } void cogl_pango_ensure_glyph_cache_for_layout (PangoLayout *layout) { PangoContext *context; PangoRenderer *renderer; PangoLayoutIter *iter; g_return_if_fail (PANGO_IS_LAYOUT (layout)); if ((iter = pango_layout_get_iter (layout)) == NULL) return; context = pango_layout_get_context (layout); renderer = PANGO_RENDERER (cogl_pango_get_renderer_from_context (context)); 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); if (pango_color) { CoglColor color; cogl_color_set_from_4ub (&color, pango_color->red >> 8, pango_color->green >> 8, pango_color->blue >> 8, 0xff); _cogl_pango_display_list_set_color_override (priv->display_list, &color); } else _cogl_pango_display_list_remove_color_override (priv->display_list); } static void cogl_pango_renderer_draw_box (PangoRenderer *renderer, int x, int y, int width, int height) { CoglPangoRenderer *priv = COGL_PANGO_RENDERER (renderer); g_return_if_fail (priv->display_list != NULL); _cogl_pango_display_list_add_rectangle (priv->display_list, x, y - height, x + width, y); } static void cogl_pango_renderer_get_device_units (PangoRenderer *renderer, int xin, int yin, float *xout, float *yout) { const PangoMatrix *matrix; if ((matrix = pango_renderer_get_matrix (renderer))) { /* Convert user-space coords to device coords */ *xout = ((xin * matrix->xx + yin * matrix->xy) / PANGO_SCALE + matrix->x0); *yout = ((yin * matrix->yy + xin * matrix->yx) / PANGO_SCALE + matrix->y0); } else { *xout = PANGO_PIXELS (xin); *yout = PANGO_PIXELS (yin); } } static void cogl_pango_renderer_draw_rectangle (PangoRenderer *renderer, PangoRenderPart part, int x, int y, int width, int height) { CoglPangoRenderer *priv = COGL_PANGO_RENDERER (renderer); float x1, x2, y1, y2; g_return_if_fail (priv->display_list != NULL); 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_pango_display_list_add_rectangle (priv->display_list, 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]; g_return_if_fail (priv->display_list != NULL); 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_pango_display_list_add_trapezoid (priv->display_list, y1, x11, x21, y2, x12, x22); } 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; 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_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; } }