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Diffstat (limited to 'examples/viewer-pangocairo.c')
| -rw-r--r-- | examples/viewer-pangocairo.c | 425 |
1 files changed, 0 insertions, 425 deletions
diff --git a/examples/viewer-pangocairo.c b/examples/viewer-pangocairo.c deleted file mode 100644 index 16c6d8bf..00000000 --- a/examples/viewer-pangocairo.c +++ /dev/null @@ -1,425 +0,0 @@ -/* viewer-pangocairo.c: PangoCairo viewer backend. - * - * Copyright (C) 1999,2004,2005 Red Hat, Inc. - * Copyright (C) 2001 Sun Microsystems - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Library 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 - * Library General Public License for more details. - * - * You should have received a copy of the GNU Library General Public - * License along with this library; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 02111-1307, USA. - */ - -#include <config.h> - -#include "renderdemo.h" -#include "viewer-cairo.h" - -#include <pango/pangocairo.h> - -typedef struct -{ - const CairoViewerIface *iface; - - gpointer backend; - - PangoFontMap *fontmap; - cairo_font_options_t *font_options; -} CairoViewer; - -/* TODO: hinting */ -static gpointer -pangocairo_view_create (const PangoViewer *klass) -{ - CairoViewer *instance; - - instance = g_slice_new (CairoViewer); - - instance->iface = get_default_cairo_viewer_iface (); - instance->backend = instance->iface->backend_class->create (instance->iface->backend_class); - - instance->fontmap = pango_cairo_font_map_get_default (); - pango_cairo_font_map_set_resolution (PANGO_CAIRO_FONT_MAP (instance->fontmap), opt_dpi); - - instance->font_options = cairo_font_options_create (); - if (opt_hinting != HINT_DEFAULT) - { - cairo_font_options_set_hint_metrics (instance->font_options, CAIRO_HINT_METRICS_ON); - - if (opt_hinting == HINT_NONE) - cairo_font_options_set_hint_style (instance->font_options, CAIRO_HINT_STYLE_NONE); - else if (opt_hinting == HINT_FULL) - cairo_font_options_set_hint_style (instance->font_options, CAIRO_HINT_STYLE_FULL); - } - - return instance; -} - -static void -pangocairo_view_destroy (gpointer instance) -{ - CairoViewer *c = (CairoViewer *) instance; - - cairo_font_options_destroy (c->font_options); - - g_object_unref (c->fontmap); - - c->iface->backend_class->destroy (c->backend); - - g_slice_free (CairoViewer, c); -} - -static PangoContext * -pangocairo_view_get_context (gpointer instance) -{ - CairoViewer *c = (CairoViewer *) instance; - PangoContext *context; - - context = pango_cairo_font_map_create_context (PANGO_CAIRO_FONT_MAP (c->fontmap)); - pango_cairo_context_set_font_options (context, c->font_options); - - return context; -} - -typedef struct -{ - gpointer backend; - - cairo_surface_t *cairo; -} CairoSurface; - -static gpointer -pangocairo_view_create_surface (gpointer instance, - int width, - int height) -{ - CairoViewer *c = (CairoViewer *) instance; - CairoSurface *surface; - - surface = g_slice_new (CairoSurface); - - surface->backend = c->iface->backend_class->create_surface (c->backend, - width, height); - - surface->cairo = c->iface->create_surface (c->backend, - surface->backend, - width, height); - - return surface; -} - -static void -pangocairo_view_destroy_surface (gpointer instance, - gpointer surface) -{ - CairoViewer *c = (CairoViewer *) instance; - CairoSurface *c_surface = (CairoSurface *) surface; - - c->iface->backend_class->destroy_surface (c->backend, c_surface->backend); - cairo_surface_destroy (c_surface->cairo); - - g_slice_free (CairoSurface, surface); -} - -static void -render_callback (PangoLayout *layout, - int x, - int y, - gpointer context, - gpointer data) -{ - cairo_t *cr = (cairo_t *) context; - gboolean show_borders = GPOINTER_TO_UINT (data) == 0xdeadbeef; - - cairo_save (cr); - cairo_translate (cr, x, y); - - if (show_borders) - { - cairo_pattern_t *pattern; - PangoRectangle ink, logical; - double lw = cairo_get_line_width (cr); - PangoLayoutIter* iter; - - pango_layout_get_extents (layout, &ink, &logical); - - /* draw resolved gravity "roof" in blue */ - cairo_save (cr); - cairo_translate (cr, - (double)logical.x / PANGO_SCALE, - (double)logical.y / PANGO_SCALE); - cairo_scale (cr, - (double)logical.width / PANGO_SCALE * 0.5, - (double)logical.height / PANGO_SCALE * 0.5); - cairo_translate (cr, 1.0, 1.0); - cairo_rotate (cr, - pango_gravity_to_rotation ( - pango_context_get_base_gravity ( - pango_layout_get_context (layout)))); - cairo_move_to (cr, -1.0, -1.0); - cairo_rel_line_to (cr, +1.0, -0.2); /* / */ - cairo_rel_line_to (cr, +1.0, +0.2); /* \ */ - cairo_close_path (cr); /* - */ - pattern = cairo_pattern_create_linear (0, -1.0, 0, -1.2); - cairo_pattern_add_color_stop_rgba (pattern, 0.0, 0.0, 0.0, 1.0, 0.0); - cairo_pattern_add_color_stop_rgba (pattern, 1.0, 0.0, 0.0, 1.0, 0.15); - cairo_set_source (cr, pattern); - cairo_fill (cr); - /* once more, without close_path this time */ - cairo_move_to (cr, -1.0, -1.0); - cairo_rel_line_to (cr, +1.0, -0.2); /* / */ - cairo_rel_line_to (cr, +1.0, +0.2); /* \ */ - /* silly line_width is not locked :(. get rid of scale. */ - cairo_restore (cr); - cairo_save (cr); - cairo_set_source_rgba (cr, 0.0, 0.0, 0.7, 0.2); - cairo_stroke (cr); - cairo_restore (cr); - - - /* draw block progression arrow in green */ - cairo_save (cr); - cairo_translate (cr, - (double)logical.x / PANGO_SCALE, - (double)logical.y / PANGO_SCALE); - cairo_scale (cr, - (double)logical.width / PANGO_SCALE * 0.5, - (double)logical.height / PANGO_SCALE * 0.5); - cairo_translate (cr, 1.0, 1.0); - cairo_move_to (cr, -0.4, -0.7); - cairo_rel_line_to (cr, +0.8, 0.0); /* -- */ - cairo_rel_line_to (cr, 0.0, +0.9); /* | */ - cairo_rel_line_to (cr, +0.4, 0.0); /* - */ - cairo_rel_line_to (cr, -0.8, +0.5); /* / */ - cairo_rel_line_to (cr, -0.8, -0.5); /* \ */ - cairo_rel_line_to (cr, +0.4, 0.0); /* - */ - cairo_close_path (cr); /* | */ - pattern = cairo_pattern_create_linear (0, -0.7, 0, 0.7); - cairo_pattern_add_color_stop_rgba (pattern, 0.0, 0.0, 1.0, 0.0, 0.0); - cairo_pattern_add_color_stop_rgba (pattern, 1.0, 0.0, 1.0, 0.0, 0.15); - cairo_set_source (cr, pattern); - cairo_fill_preserve (cr); - /* silly line_width is not locked :(. get rid of scale. */ - cairo_restore (cr); - cairo_save (cr); - cairo_set_source_rgba (cr, 0.0, 0.7, 0.0, 0.2); - cairo_stroke (cr); - cairo_restore (cr); - - /* draw baselines with line direction arrow in orange */ - cairo_save (cr); - cairo_set_source_rgba (cr, 1.0, 0.5, 0.0, 0.5); - iter = pango_layout_get_iter (layout); - do - { - PangoLayoutLine *line = pango_layout_iter_get_line (iter); - double width = (double)logical.width / PANGO_SCALE; - - y = pango_layout_iter_get_baseline (iter); - cairo_save (cr); - cairo_translate (cr, - (double)logical.x / PANGO_SCALE + width * 0.5, - (double)y / PANGO_SCALE); - if (line->resolved_dir) - cairo_scale (cr, -1, 1); - cairo_move_to (cr, -width * .5, -lw*0.2); - cairo_rel_line_to (cr, +width * .9, -lw*0.3); - cairo_rel_line_to (cr, 0, -lw); - cairo_rel_line_to (cr, +width * .1, +lw*1.5); - cairo_rel_line_to (cr, -width * .1, +lw*1.5); - cairo_rel_line_to (cr, 0, -lw); - cairo_rel_line_to (cr, -width * .9, -lw*0.3); - cairo_close_path (cr); - cairo_fill (cr); - cairo_restore (cr); - } - while (pango_layout_iter_next_line (iter)); - pango_layout_iter_free (iter); - cairo_restore (cr); - - /* draw the logical rect in red */ - cairo_save (cr); - cairo_set_source_rgba (cr, 1.0, 0.0, 0.0, 0.5); - cairo_rectangle (cr, - (double)logical.x / PANGO_SCALE - lw / 2, - (double)logical.y / PANGO_SCALE - lw / 2, - (double)logical.width / PANGO_SCALE + lw, - (double)logical.height / PANGO_SCALE + lw); - cairo_stroke (cr); - cairo_restore (cr); - - /* draw the ink rect in green */ - cairo_save (cr); - cairo_set_source_rgba (cr, 0.0, 1.0, 0.0, 0.5); - cairo_rectangle (cr, - (double)ink.x / PANGO_SCALE - lw / 2, - (double)ink.y / PANGO_SCALE - lw / 2, - (double)ink.width / PANGO_SCALE + lw, - (double)ink.height / PANGO_SCALE + lw); - cairo_stroke (cr); - cairo_restore (cr); - } - - pango_cairo_show_layout (cr, layout); - - cairo_restore (cr); -} - -static void -transform_callback (PangoContext *context, - PangoMatrix *matrix, - gpointer cr_context, - gpointer state) -{ - cairo_t *cr = (cairo_t *)cr_context; - cairo_matrix_t cairo_matrix; - - if (matrix) - { - cairo_matrix.xx = matrix->xx; - cairo_matrix.yx = matrix->yx; - cairo_matrix.xy = matrix->xy; - cairo_matrix.yy = matrix->yy; - cairo_matrix.x0 = matrix->x0; - cairo_matrix.y0 = matrix->y0; - } - else - { - cairo_matrix_init_identity (&cairo_matrix); - } - - cairo_set_matrix (cr, &cairo_matrix); - - pango_cairo_update_context (cr, context); -} - -static void -pangocairo_view_render (gpointer instance, - gpointer surface, - PangoContext *context, - int width, - int height, - gpointer state) -{ - cairo_t *cr; - CairoSurface *c_surface = (CairoSurface *) surface; - - if (!surface) - { - cairo_surface_t *cs; - /* This is annoying ... we have to create a temporary surface just to - * get the extents of the text. - */ - cs = cairo_image_surface_create (CAIRO_FORMAT_RGB24, 1, 1); - cr = cairo_create (cs); - cairo_surface_destroy (cs); - } - else - cr = cairo_create (c_surface->cairo); - - transform_callback (context, NULL, cr, state); - - cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); - cairo_paint (cr); - - cairo_set_source_rgb (cr, 0.0, 0.0, 0.0); - do_output (context, render_callback, transform_callback, cr, state, NULL, NULL); - - cairo_destroy (cr); -} - -#ifdef HAVE_CAIRO_PNG -static cairo_status_t -write_func (void *closure, - const unsigned char *data, - unsigned int length) -{ - FILE *stream = (FILE *) closure; - unsigned int l; - - l = fwrite (data, 1, length, stream); - - return l == length ? CAIRO_STATUS_SUCCESS : CAIRO_STATUS_WRITE_ERROR; -} - -static void -pangocairo_view_write (gpointer instance, - gpointer surface, - FILE *stream, - int width, - int height) -{ - CairoSurface *c_surface = (CairoSurface *) surface; - - cairo_surface_write_to_png_stream (c_surface->cairo, write_func, stream); -} -#endif - -static gpointer -pangocairo_view_create_window (gpointer instance, - const char *title, - int width, - int height) -{ - CairoViewer *c = (CairoViewer *) instance; - - return c->iface->backend_class->create_window (c->backend, - title, - width, height); -} - -static void -pangocairo_view_destroy_window (gpointer instance, - gpointer window) -{ - CairoViewer *c = (CairoViewer *) instance; - - c->iface->backend_class->destroy_window (c->backend, - window); -} - -static gpointer -pangocairo_view_display (gpointer instance, - gpointer surface, - gpointer window, - int width, int height, - gpointer state) -{ - CairoViewer *c = (CairoViewer *) instance; - CairoSurface *c_surface = (CairoSurface *) surface; - - return c->iface->backend_class->display (c->backend, - c_surface->backend, - window, - width, height, - state); -} - -const PangoViewer pangocairo_viewer = { - "PangoCairo", - "cairo", - NULL, - pangocairo_view_create, - pangocairo_view_destroy, - pangocairo_view_get_context, - pangocairo_view_create_surface, - pangocairo_view_destroy_surface, - pangocairo_view_render, -#ifdef HAVE_CAIRO_PNG - pangocairo_view_write, -#else - NULL, -#endif - pangocairo_view_create_window, - pangocairo_view_destroy_window, - pangocairo_view_display -}; |