Started implementing the new text layout stuff on GTK+. The drawtext example works.
This commit is contained in:
Pietro Gagliardi
parent
7f270942a7
commit
5444f76bd3
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@ -117,6 +117,7 @@ int main(void)
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uiWindowOnClosing(mainwin, onClosing, NULL);
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area = uiNewArea(&handler);
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// TODO on GTK+ this doesn't get expand properties set properly?
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uiWindowSetChild(mainwin, uiControl(area));
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uiControlShow(uiControl(mainwin));
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@ -22,7 +22,7 @@ list(APPEND _LIBUI_SOURCES
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unix/drawtext.c
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unix/editablecombo.c
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unix/entry.c
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unix/fontbutton.c
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# unix/fontbutton.c
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unix/form.c
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unix/future.c
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unix/graphemes.c
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@ -0,0 +1,217 @@
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// 6 september 2015
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#include "uipriv_unix.h"
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#include "draw.h"
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struct uiDrawFontFamilies {
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PangoFontFamily **f;
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int n;
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};
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uiDrawFontFamilies *uiDrawListFontFamilies(void)
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{
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uiDrawFontFamilies *ff;
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PangoFontMap *map;
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ff = uiNew(uiDrawFontFamilies);
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map = pango_cairo_font_map_get_default();
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pango_font_map_list_families(map, &(ff->f), &(ff->n));
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// do not free map; it's a shared resource
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return ff;
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}
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int uiDrawFontFamiliesNumFamilies(uiDrawFontFamilies *ff)
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{
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return ff->n;
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}
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char *uiDrawFontFamiliesFamily(uiDrawFontFamilies *ff, int n)
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{
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PangoFontFamily *f;
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f = ff->f[n];
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return uiUnixStrdupText(pango_font_family_get_name(f));
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}
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void uiDrawFreeFontFamilies(uiDrawFontFamilies *ff)
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{
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g_free(ff->f);
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uiFree(ff);
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}
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struct uiDrawTextFont {
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PangoFont *f;
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};
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uiDrawTextFont *mkTextFont(PangoFont *f, gboolean ref)
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{
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uiDrawTextFont *font;
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font = uiNew(uiDrawTextFont);
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font->f = f;
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if (ref)
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g_object_ref(font->f);
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return font;
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}
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PangoFont *pangoDescToPangoFont(PangoFontDescription *pdesc)
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{
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PangoFont *f;
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PangoContext *context;
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// in this case, the context is necessary for the metrics to be correct
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context = mkGenericPangoCairoContext();
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f = pango_font_map_load_font(pango_cairo_font_map_get_default(), context, pdesc);
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if (f == NULL) {
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// LONGTERM
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g_error("[libui] no match in pangoDescToPangoFont(); report to andlabs");
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}
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g_object_unref(context);
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return f;
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}
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uiDrawTextFont *uiDrawLoadClosestFont(const uiDrawTextFontDescriptor *desc)
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{
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PangoFont *f;
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PangoFontDescription *pdesc;
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pdesc = pango_font_description_new();
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pango_font_description_set_family(pdesc,
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desc->Family);
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pango_font_description_set_size(pdesc,
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(gint) (desc->Size * PANGO_SCALE));
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pango_font_description_set_weight(pdesc,
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pangoWeights[desc->Weight]);
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pango_font_description_set_style(pdesc,
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pangoItalics[desc->Italic]);
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pango_font_description_set_stretch(pdesc,
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pangoStretches[desc->Stretch]);
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f = pangoDescToPangoFont(pdesc);
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pango_font_description_free(pdesc);
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return mkTextFont(f, FALSE); // we hold the initial reference; no need to ref
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}
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void uiDrawFreeTextFont(uiDrawTextFont *font)
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{
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g_object_unref(font->f);
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uiFree(font);
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}
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uintptr_t uiDrawTextFontHandle(uiDrawTextFont *font)
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{
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return (uintptr_t) (font->f);
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}
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void uiDrawTextFontDescribe(uiDrawTextFont *font, uiDrawTextFontDescriptor *desc)
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{
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PangoFontDescription *pdesc;
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// this creates a copy; we free it later
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pdesc = pango_font_describe(font->f);
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// TODO
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pango_font_description_free(pdesc);
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}
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// See https://developer.gnome.org/pango/1.30/pango-Cairo-Rendering.html#pango-Cairo-Rendering.description
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// Note that we convert to double before dividing to make sure the floating-point stuff is right
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#define pangoToCairo(pango) (((double) (pango)) / PANGO_SCALE)
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#define cairoToPango(cairo) ((gint) ((cairo) * PANGO_SCALE))
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void uiDrawTextFontGetMetrics(uiDrawTextFont *font, uiDrawTextFontMetrics *metrics)
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{
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PangoFontMetrics *pm;
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pm = pango_font_get_metrics(font->f, NULL);
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metrics->Ascent = pangoToCairo(pango_font_metrics_get_ascent(pm));
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metrics->Descent = pangoToCairo(pango_font_metrics_get_descent(pm));
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// Pango doesn't seem to expose this :( Use 0 and hope for the best.
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metrics->Leading = 0;
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metrics->UnderlinePos = pangoToCairo(pango_font_metrics_get_underline_position(pm));
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metrics->UnderlineThickness = pangoToCairo(pango_font_metrics_get_underline_thickness(pm));
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pango_font_metrics_unref(pm);
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}
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// note: PangoCairoLayouts are tied to a given cairo_t, so we can't store one in this device-independent structure
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struct uiDrawTextLayout {
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char *s;
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ptrdiff_t *graphemes;
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PangoFont *defaultFont;
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double width;
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PangoAttrList *attrs;
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};
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uiDrawTextLayout *uiDrawNewTextLayout(const char *text, uiDrawTextFont *defaultFont, double width)
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{
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uiDrawTextLayout *layout;
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PangoContext *context;
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layout = uiNew(uiDrawTextLayout);
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layout->s = g_strdup(text);
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context = mkGenericPangoCairoContext();
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layout->graphemes = graphemes(layout->s, context);
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g_object_unref(context);
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layout->defaultFont = defaultFont->f;
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g_object_ref(layout->defaultFont); // retain a copy
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uiDrawTextLayoutSetWidth(layout, width);
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layout->attrs = pango_attr_list_new();
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return layout;
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}
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void uiDrawFreeTextLayout(uiDrawTextLayout *layout)
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{
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pango_attr_list_unref(layout->attrs);
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g_object_unref(layout->defaultFont);
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uiFree(layout->graphemes);
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g_free(layout->s);
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uiFree(layout);
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}
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void uiDrawTextLayoutSetWidth(uiDrawTextLayout *layout, double width)
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{
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layout->width = width;
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}
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static void prepareLayout(uiDrawTextLayout *layout, PangoLayout *pl)
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{
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// again, this makes a copy
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desc = pango_font_describe(layout->defaultFont);
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pango_layout_set_attributes(pl, layout->attrs);
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}
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void uiDrawText(uiDrawContext *c, double x, double y, uiDrawTextLayout *layout)
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{
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PangoLayout *pl;
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pl = pango_cairo_create_layout(c->cr);
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}
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static void addAttr(uiDrawTextLayout *layout, PangoAttribute *attr, int startChar, int endChar)
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{
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attr->start_index = layout->graphemes[startChar];
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attr->end_index = layout->graphemes[endChar];
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pango_attr_list_insert(layout->attrs, attr);
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// pango_attr_list_insert() takes attr; we don't free it
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}
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void uiDrawTextLayoutSetColor(uiDrawTextLayout *layout, int startChar, int endChar, double r, double g, double b, double a)
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{
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PangoAttribute *attr;
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guint16 rr, gg, bb, aa;
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rr = (guint16) (r * 65535);
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gg = (guint16) (g * 65535);
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bb = (guint16) (b * 65535);
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aa = (guint16) (a * 65535);
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attr = pango_attr_foreground_new(rr, gg, bb);
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addAttr(layout, attr, startChar, endChar);
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// TODO what if aa == 0?
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attr = FUTURE_pango_attr_foreground_alpha_new(aa);
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if (attr != NULL)
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addAttr(layout, attr, startChar, endChar);
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}
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339
unix/drawtext.c
339
unix/drawtext.c
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@ -1,71 +1,21 @@
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// 6 september 2015
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// 17 january 2017
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#include "uipriv_unix.h"
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#include "draw.h"
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struct uiDrawFontFamilies {
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PangoFontFamily **f;
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int n;
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struct uiDrawTextLayout {
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PangoLayout *layout;
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};
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uiDrawFontFamilies *uiDrawListFontFamilies(void)
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{
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uiDrawFontFamilies *ff;
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PangoFontMap *map;
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// See https://developer.gnome.org/pango/1.30/pango-Cairo-Rendering.html#pango-Cairo-Rendering.description
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// For the conversion, see https://developer.gnome.org/pango/1.30/pango-Glyph-Storage.html#pango-units-to-double and https://developer.gnome.org/pango/1.30/pango-Glyph-Storage.html#pango-units-from-double
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#define pangoToCairo(pango) (pango_units_to_double(pango))
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#define cairoToPango(cairo) (pango_units_from_double(cairo))
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ff = uiNew(uiDrawFontFamilies);
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map = pango_cairo_font_map_get_default();
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pango_font_map_list_families(map, &(ff->f), &(ff->n));
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// do not free map; it's a shared resource
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return ff;
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}
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int uiDrawFontFamiliesNumFamilies(uiDrawFontFamilies *ff)
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{
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return ff->n;
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}
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char *uiDrawFontFamiliesFamily(uiDrawFontFamilies *ff, int n)
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{
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PangoFontFamily *f;
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f = ff->f[n];
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return uiUnixStrdupText(pango_font_family_get_name(f));
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}
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void uiDrawFreeFontFamilies(uiDrawFontFamilies *ff)
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{
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g_free(ff->f);
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uiFree(ff);
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}
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struct uiDrawTextFont {
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PangoFont *f;
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};
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uiDrawTextFont *mkTextFont(PangoFont *f, gboolean ref)
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{
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uiDrawTextFont *font;
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font = uiNew(uiDrawTextFont);
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font->f = f;
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if (ref)
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g_object_ref(font->f);
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return font;
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}
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static const PangoWeight pangoWeights[] = {
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[uiDrawTextWeightThin] = PANGO_WEIGHT_THIN,
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[uiDrawTextWeightUltraLight] = PANGO_WEIGHT_ULTRALIGHT,
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[uiDrawTextWeightLight] = PANGO_WEIGHT_LIGHT,
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[uiDrawTextWeightBook] = PANGO_WEIGHT_BOOK,
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[uiDrawTextWeightNormal] = PANGO_WEIGHT_NORMAL,
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[uiDrawTextWeightMedium] = PANGO_WEIGHT_MEDIUM,
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[uiDrawTextWeightSemiBold] = PANGO_WEIGHT_SEMIBOLD,
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[uiDrawTextWeightBold] = PANGO_WEIGHT_BOLD,
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[uiDrawTextWeightUltraBold] = PANGO_WEIGHT_ULTRABOLD,
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[uiDrawTextWeightHeavy] = PANGO_WEIGHT_HEAVY,
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[uiDrawTextWeightUltraHeavy] = PANGO_WEIGHT_ULTRAHEAVY,
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};
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// we need a context for a few things
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// the documentation suggests creating cairo_t-specific, GdkScreen-specific, or even GtkWidget-specific contexts, but we can't really do that because we want our uiDrawTextFonts and uiDrawTextLayouts to be context-independent
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// we could use pango_font_map_create_context(pango_cairo_font_map_get_default()) but that will ignore GDK-specific settings
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// so let's use gdk_pango_context_get() instead; even though it's for the default screen only, it's good enough for us
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#define mkGenericPangoCairoContext() (gdk_pango_context_get())
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static const PangoStyle pangoItalics[] = {
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[uiDrawTextItalicNormal] = PANGO_STYLE_NORMAL,
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@ -85,209 +35,112 @@ static const PangoStretch pangoStretches[] = {
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[uiDrawTextStretchUltraExpanded] = PANGO_STRETCH_ULTRA_EXPANDED,
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};
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// we need a context for a few things
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// the documentation suggests creating cairo_t-specific, GdkScreen-specific, or even GtkWidget-specific contexts, but we can't really do that because we want our uiDrawTextFonts and uiDrawTextLayouts to be context-independent
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// we could use pango_font_map_create_context(pango_cairo_font_map_get_default()) but that will ignore GDK-specific settings
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// so let's use gdk_pango_context_get() instead; even though it's for the default screen only, it's good enough for us
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#define mkGenericPangoCairoContext() (gdk_pango_context_get())
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PangoFont *pangoDescToPangoFont(PangoFontDescription *pdesc)
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uiDrawTextLayout *uiDrawNewTextLayout(uiAttributedString *s, uiDrawFontDescriptor *defaultFont, double width)
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{
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PangoFont *f;
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uiDrawTextLayout *tl;
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PangoContext *context;
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// in this case, the context is necessary for the metrics to be correct
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context = mkGenericPangoCairoContext();
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f = pango_font_map_load_font(pango_cairo_font_map_get_default(), context, pdesc);
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if (f == NULL) {
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// LONGTERM
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g_error("[libui] no match in pangoDescToPangoFont(); report to andlabs");
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}
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g_object_unref(context);
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return f;
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}
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uiDrawTextFont *uiDrawLoadClosestFont(const uiDrawTextFontDescriptor *desc)
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{
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PangoFont *f;
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PangoFontDescription *pdesc;
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pdesc = pango_font_description_new();
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pango_font_description_set_family(pdesc,
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desc->Family);
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pango_font_description_set_size(pdesc,
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(gint) (desc->Size * PANGO_SCALE));
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pango_font_description_set_weight(pdesc,
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pangoWeights[desc->Weight]);
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pango_font_description_set_style(pdesc,
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pangoItalics[desc->Italic]);
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pango_font_description_set_stretch(pdesc,
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pangoStretches[desc->Stretch]);
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f = pangoDescToPangoFont(pdesc);
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pango_font_description_free(pdesc);
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return mkTextFont(f, FALSE); // we hold the initial reference; no need to ref
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}
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void uiDrawFreeTextFont(uiDrawTextFont *font)
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{
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g_object_unref(font->f);
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uiFree(font);
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}
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uintptr_t uiDrawTextFontHandle(uiDrawTextFont *font)
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{
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return (uintptr_t) (font->f);
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}
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void uiDrawTextFontDescribe(uiDrawTextFont *font, uiDrawTextFontDescriptor *desc)
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{
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PangoFontDescription *pdesc;
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// this creates a copy; we free it later
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pdesc = pango_font_describe(font->f);
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// TODO
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pango_font_description_free(pdesc);
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}
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// See https://developer.gnome.org/pango/1.30/pango-Cairo-Rendering.html#pango-Cairo-Rendering.description
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// Note that we convert to double before dividing to make sure the floating-point stuff is right
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#define pangoToCairo(pango) (((double) (pango)) / PANGO_SCALE)
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#define cairoToPango(cairo) ((gint) ((cairo) * PANGO_SCALE))
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void uiDrawTextFontGetMetrics(uiDrawTextFont *font, uiDrawTextFontMetrics *metrics)
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{
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PangoFontMetrics *pm;
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pm = pango_font_get_metrics(font->f, NULL);
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metrics->Ascent = pangoToCairo(pango_font_metrics_get_ascent(pm));
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metrics->Descent = pangoToCairo(pango_font_metrics_get_descent(pm));
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// Pango doesn't seem to expose this :( Use 0 and hope for the best.
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metrics->Leading = 0;
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metrics->UnderlinePos = pangoToCairo(pango_font_metrics_get_underline_position(pm));
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metrics->UnderlineThickness = pangoToCairo(pango_font_metrics_get_underline_thickness(pm));
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pango_font_metrics_unref(pm);
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}
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// note: PangoCairoLayouts are tied to a given cairo_t, so we can't store one in this device-independent structure
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struct uiDrawTextLayout {
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char *s;
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ptrdiff_t *graphemes;
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PangoFont *defaultFont;
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double width;
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PangoAttrList *attrs;
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};
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uiDrawTextLayout *uiDrawNewTextLayout(const char *text, uiDrawTextFont *defaultFont, double width)
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{
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uiDrawTextLayout *layout;
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PangoContext *context;
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layout = uiNew(uiDrawTextLayout);
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layout->s = g_strdup(text);
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context = mkGenericPangoCairoContext();
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layout->graphemes = graphemes(layout->s, context);
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g_object_unref(context);
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layout->defaultFont = defaultFont->f;
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g_object_ref(layout->defaultFont); // retain a copy
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uiDrawTextLayoutSetWidth(layout, width);
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layout->attrs = pango_attr_list_new();
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return layout;
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}
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void uiDrawFreeTextLayout(uiDrawTextLayout *layout)
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{
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pango_attr_list_unref(layout->attrs);
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g_object_unref(layout->defaultFont);
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uiFree(layout->graphemes);
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g_free(layout->s);
|
||||
uiFree(layout);
|
||||
}
|
||||
|
||||
void uiDrawTextLayoutSetWidth(uiDrawTextLayout *layout, double width)
|
||||
{
|
||||
layout->width = width;
|
||||
}
|
||||
|
||||
static void prepareLayout(uiDrawTextLayout *layout, PangoLayout *pl)
|
||||
{
|
||||
PangoFontDescription *desc;
|
||||
int width;
|
||||
int pangoWidth;
|
||||
|
||||
pango_layout_set_text(pl, layout->s, -1);
|
||||
|
||||
// again, this makes a copy
|
||||
desc = pango_font_describe(layout->defaultFont);
|
||||
// this is safe; the description is copied
|
||||
pango_layout_set_font_description(pl, desc);
|
||||
pango_font_description_free(desc);
|
||||
|
||||
width = cairoToPango(layout->width);
|
||||
if (layout->width < 0)
|
||||
width = -1;
|
||||
pango_layout_set_width(pl, width);
|
||||
|
||||
pango_layout_set_attributes(pl, layout->attrs);
|
||||
}
|
||||
|
||||
void uiDrawTextLayoutExtents(uiDrawTextLayout *layout, double *width, double *height)
|
||||
{
|
||||
PangoContext *context;
|
||||
PangoLayout *pl;
|
||||
PangoRectangle logical;
|
||||
tl = uiNew(uiDrawTextLayout);
|
||||
|
||||
// in this case, the context is necessary to create the layout
|
||||
// the layout takes a ref on the context so we can unref it afterward
|
||||
context = mkGenericPangoCairoContext();
|
||||
pl = pango_layout_new(context);
|
||||
tl->layout = pango_layout_new(context);
|
||||
g_object_unref(context);
|
||||
prepareLayout(layout, pl);
|
||||
|
||||
pango_layout_get_extents(pl, NULL, &logical);
|
||||
// this is safe; pango_layout_set_text() copies the string
|
||||
pango_layout_set_text(tl->layout, uiAttributedStringString(s), -1);
|
||||
|
||||
g_object_unref(pl);
|
||||
desc = pango_font_description_new();
|
||||
pango_font_description_set_family(desc, defaultFont->Family);
|
||||
pango_font_description_set_style(desc, pangoItalics[defaultFont->Italic]);
|
||||
// for the most part, pango weights correlate to ours
|
||||
// the differences:
|
||||
// - Book — libui: 350, Pango: 380
|
||||
// - Ultra Heavy — libui: 950, Pango: 1000
|
||||
// TODO figure out what to do about this misalignment
|
||||
pango_font_description_set_weight(desc, defaultFont->Weight);
|
||||
pango_font_description_set_stretch(desc, pangoStretches[defaultFont->Stretch]);
|
||||
// see https://developer.gnome.org/pango/1.30/pango-Fonts.html#pango-font-description-set-size and https://developer.gnome.org/pango/1.30/pango-Glyph-Storage.html#pango-units-from-double
|
||||
pango_font_description_set_size(desc, pango_units_from_double(defaultFont->Size));
|
||||
pango_layout_set_font_description(tl->layout, desc);
|
||||
// this is safe; the description is copied
|
||||
pango_font_description_free(desc);
|
||||
|
||||
pangoWidth = cairoToPango(width);
|
||||
if (width < 0)
|
||||
pangoWidth = -1;
|
||||
pango_layout_set_width(tl->layout, pangoWidth);
|
||||
|
||||
// TODO attributes
|
||||
|
||||
return tl;
|
||||
}
|
||||
|
||||
void uiDrawFreeTextLayout(uiDrawTextLayout *tl)
|
||||
{
|
||||
g_object_unref(tl->layout);
|
||||
uiFree(tl);
|
||||
}
|
||||
|
||||
void uiDrawText(uiDrawContext *c, uiDrawTextLayout *tl, double x, double y)
|
||||
{
|
||||
cairo_move_to(c->cr, x, y);
|
||||
pango_cairo_show_layout(c->cr, tl->layout);
|
||||
}
|
||||
|
||||
void uiDrawTextLayoutExtents(uiDrawTextLayout *tl, double *width, double *height)
|
||||
{
|
||||
PangoRectangle logical;
|
||||
|
||||
pango_layout_get_extents(tl->layout, NULL, &logical);
|
||||
*width = pangoToCairo(logical.width);
|
||||
*height = pangoToCairo(logical.height);
|
||||
}
|
||||
|
||||
void uiDrawText(uiDrawContext *c, double x, double y, uiDrawTextLayout *layout)
|
||||
int uiDrawTextLayoutNumLines(uiDrawTextLayout *tl)
|
||||
{
|
||||
PangoLayout *pl;
|
||||
|
||||
pl = pango_cairo_create_layout(c->cr);
|
||||
prepareLayout(layout, pl);
|
||||
|
||||
cairo_move_to(c->cr, x, y);
|
||||
pango_cairo_show_layout(c->cr, pl);
|
||||
|
||||
g_object_unref(pl);
|
||||
return pango_layout_get_line_count(tl->layout);
|
||||
}
|
||||
|
||||
static void addAttr(uiDrawTextLayout *layout, PangoAttribute *attr, int startChar, int endChar)
|
||||
void uiDrawTextLayoutLineByteRange(uiDrawTextLayout *tl, int line, size_t *start, size_t *end)
|
||||
{
|
||||
attr->start_index = layout->graphemes[startChar];
|
||||
attr->end_index = layout->graphemes[endChar];
|
||||
pango_attr_list_insert(layout->attrs, attr);
|
||||
// pango_attr_list_insert() takes attr; we don't free it
|
||||
PangoLayoutLine *pll;
|
||||
|
||||
pll = pango_layout_get_line_readonly(tl->layout, line);
|
||||
*start = pll->start_index;
|
||||
*end = pll->start_index + pll->length;
|
||||
// TODO unref?
|
||||
}
|
||||
|
||||
void uiDrawTextLayoutSetColor(uiDrawTextLayout *layout, int startChar, int endChar, double r, double g, double b, double a)
|
||||
void uiDrawTextLayoutLineGetMetrics(uiDrawTextLayout *tl, int line, uiDrawTextLayoutLineMetrics *m)
|
||||
{
|
||||
PangoAttribute *attr;
|
||||
guint16 rr, gg, bb, aa;
|
||||
PangoLayoutLine *pll;
|
||||
|
||||
rr = (guint16) (r * 65535);
|
||||
gg = (guint16) (g * 65535);
|
||||
bb = (guint16) (b * 65535);
|
||||
aa = (guint16) (a * 65535);
|
||||
|
||||
attr = pango_attr_foreground_new(rr, gg, bb);
|
||||
addAttr(layout, attr, startChar, endChar);
|
||||
|
||||
// TODO what if aa == 0?
|
||||
attr = FUTURE_pango_attr_foreground_alpha_new(aa);
|
||||
if (attr != NULL)
|
||||
addAttr(layout, attr, startChar, endChar);
|
||||
pll = pango_layout_get_line_readonly(tl->layout, line);
|
||||
// TODO unref?
|
||||
}
|
||||
|
||||
// TODO
|
||||
#if 0
|
||||
{
|
||||
PangoLayoutLine *pll;
|
||||
|
||||
pll = pango_layout_get_line_readonly(tl->layout, line);
|
||||
// TODO unref?
|
||||
}
|
||||
#endif
|
||||
|
||||
void uiDrawTextLayoutByteIndexToGraphemeRect(uiDrawTextLayout *tl, size_t pos, int *line, double *x, double *y, double *width, double *height)
|
||||
{
|
||||
}
|
||||
|
||||
void uiDrawTextLayoutHitTest(uiDrawTextLayout *tl, double x, double y, uiDrawTextLayoutHitTestResult *result)
|
||||
{
|
||||
}
|
||||
|
||||
void uiDrawTextLayoutByteRangeToRectangle(uiDrawTextLayout *tl, size_t start, size_t end, uiDrawTextLayoutByteRangeRectangle *r)
|
||||
{
|
||||
}
|
||||
|
|
|
|||
|
|
@ -6,7 +6,7 @@ int graphemesTakesUTF16(void)
|
|||
return 0;
|
||||
}
|
||||
|
||||
struct graphemes *graphemes(void *s, size_t len);
|
||||
struct graphemes *graphemes(void *s, size_t len)
|
||||
{
|
||||
struct graphemes *g;
|
||||
char *text = (char *) s;
|
||||
|
|
|
|||
|
|
@ -46,8 +46,10 @@ extern uiDrawContext *newContext(cairo_t *);
|
|||
extern void freeContext(uiDrawContext *);
|
||||
|
||||
// drawtext.c
|
||||
#if 0 /* TODO */
|
||||
extern uiDrawTextFont *mkTextFont(PangoFont *f, gboolean add);
|
||||
extern PangoFont *pangoDescToPangoFont(PangoFontDescription *pdesc);
|
||||
#endif
|
||||
|
||||
// image.c
|
||||
/*TODO remove this*/typedef struct uiImage uiImage;
|
||||
|
|
|
|||
Loading…
Reference in New Issue