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145 lines
4.2 KiB
C
145 lines
4.2 KiB
C
#include "config.h"
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#include "gskresources.h"
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#include "gskprivate.h"
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#include <cairo.h>
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#include <pango/pangocairo.h>
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#ifdef HAVE_PANGOFT
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#include <pango/pangoft2.h>
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#endif
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#include <math.h>
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static gpointer
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register_resources (gpointer data)
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{
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_gsk_register_resource ();
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return NULL;
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}
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void
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gsk_ensure_resources (void)
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{
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static GOnce register_resources_once = G_ONCE_INIT;
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g_once (®ister_resources_once, register_resources, NULL);
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}
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/*< private >
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* gsk_reload_font:
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* @font: a `PangoFont`
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* @scale: the scale to apply
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* @hint_metris: hint metrics to use or `CAIRO_HINT_METRICS_DEFAILT` to keep the
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* hint metrics of the font unchanged
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* @hint_style: hint style to use or `CAIRO_HINT_STYLE_DEFAULT` to keep the
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* hint style of @font unchanged
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* @antialias: antialiasing to use, or `CAIRO_ANTIALIAS_DEFAULT` to keep the
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* antialias option of @font unchanged
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*
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* Returns a font that is just like @font, but uses the
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* given scale and hinting options for its glyphs and metrics.
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*
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* Returns: (transfer full): the modified `PangoFont`
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*/
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PangoFont *
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gsk_reload_font (PangoFont *font,
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float scale,
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cairo_hint_metrics_t hint_metrics,
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cairo_hint_style_t hint_style,
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cairo_antialias_t antialias)
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{
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static cairo_font_options_t *options = NULL;
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static PangoContext *context = NULL;
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cairo_scaled_font_t *sf;
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/* These requests often come in sequentially so keep the result
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* around and re-use it if everything matches.
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*/
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static PangoFont *last_font;
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static float last_scale;
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static cairo_hint_metrics_t last_hint_metrics;
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static cairo_hint_style_t last_hint_style;
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static cairo_antialias_t last_antialias;
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static PangoFont *last_result;
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if (last_result != NULL &&
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last_font == font &&
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last_scale == scale &&
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last_hint_metrics == hint_metrics &&
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last_hint_style == hint_style &&
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last_antialias == antialias)
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return g_object_ref (last_result);
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last_scale = scale;
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last_hint_metrics = hint_metrics;
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last_hint_style = hint_style;
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last_antialias = antialias;
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g_set_object (&last_font, font);
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g_clear_object (&last_result);
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if (G_UNLIKELY (options == NULL))
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options = cairo_font_options_create ();
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sf = pango_cairo_font_get_scaled_font (PANGO_CAIRO_FONT (font));
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cairo_scaled_font_get_font_options (sf, options);
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if (hint_metrics == CAIRO_HINT_METRICS_DEFAULT)
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hint_metrics = cairo_font_options_get_hint_metrics (options);
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if (hint_style == CAIRO_HINT_STYLE_DEFAULT)
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hint_style = cairo_font_options_get_hint_style (options);
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if (antialias == CAIRO_ANTIALIAS_DEFAULT)
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antialias = cairo_font_options_get_antialias (options);
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if (1.0 == scale &&
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cairo_font_options_get_hint_metrics (options) == hint_metrics &&
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cairo_font_options_get_hint_style (options) == hint_style &&
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cairo_font_options_get_antialias (options) == antialias &&
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cairo_font_options_get_subpixel_order (options) == CAIRO_SUBPIXEL_ORDER_DEFAULT)
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{
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last_result = g_object_ref (font);
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return g_object_ref (font);
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}
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cairo_font_options_set_hint_metrics (options, hint_metrics);
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cairo_font_options_set_hint_style (options, hint_style);
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cairo_font_options_set_antialias (options, antialias);
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cairo_font_options_set_subpixel_order (options, CAIRO_SUBPIXEL_ORDER_DEFAULT);
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if (G_UNLIKELY (context == NULL))
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context = pango_context_new ();
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pango_cairo_context_set_font_options (context, options);
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last_result = pango_font_map_reload_font (pango_font_get_font_map (font), font, scale, context, NULL);
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return g_object_ref (last_result);
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}
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/*< private >
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* gsk_font_get_hint_style:
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* @font: a `PangoFont`
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*
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* Get the hint style from the cairo font options.
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*
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* Returns: the hint style
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*/
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cairo_hint_style_t
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gsk_font_get_hint_style (PangoFont *font)
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{
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static cairo_font_options_t *options = NULL;
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cairo_scaled_font_t *sf;
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cairo_hint_style_t style;
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if (G_UNLIKELY (options == NULL))
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options = cairo_font_options_create ();
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sf = pango_cairo_font_get_scaled_font (PANGO_CAIRO_FONT (font));
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cairo_scaled_font_get_font_options (sf, options);
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style = cairo_font_options_get_hint_style (options);
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return style;
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}
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