82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
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// 11 march 2018
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#include "uipriv_unix.h"
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#include "draw.h"
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#include "attrstr.h"
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struct uiDrawTextLayout {
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PangoLayout *layout;
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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 PangoAlignment pangoAligns[] = {
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[uiDrawTextAlignLeft] = PANGO_ALIGN_LEFT,
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[uiDrawTextAlignCenter] = PANGO_ALIGN_CENTER,
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[uiDrawTextAlignRight] = PANGO_ALIGN_RIGHT,
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};
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uiDrawTextLayout *uiDrawNewTextLayout(uiDrawTextLayoutParams *p)
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{
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uiDrawTextLayout *tl;
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PangoContext *context;
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PangoFontDescription *desc;
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PangoAttrList *attrs;
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int pangoWidth;
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tl = uiprivNew(uiDrawTextLayout);
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// in this case, the context is necessary to create the layout
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// the layout takes a ref on the context so we can unref it afterward
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context = mkGenericPangoCairoContext();
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tl->layout = pango_layout_new(context);
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g_object_unref(context);
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// this is safe; pango_layout_set_text() copies the string
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pango_layout_set_text(tl->layout, uiAttributedStringString(p->String), -1);
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desc = uiprivFontDescriptorToPangoFontDescription(p->DefaultFont);
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pango_layout_set_font_description(tl->layout, desc);
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// this is safe; the description is copied
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pango_font_description_free(desc);
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pangoWidth = cairoToPango(p->Width);
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if (p->Width < 0)
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pangoWidth = -1;
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pango_layout_set_width(tl->layout, pangoWidth);
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pango_layout_set_alignment(tl->layout, pangoAligns[p->Align]);
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attrs = uiprivAttributedStringToPangoAttrList(p);
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pango_layout_set_attributes(tl->layout, attrs);
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pango_attr_list_unref(attrs);
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return tl;
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}
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void uiDrawFreeTextLayout(uiDrawTextLayout *tl)
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{
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g_object_unref(tl->layout);
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uiprivFree(tl);
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}
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void uiDrawText(uiDrawContext *c, uiDrawTextLayout *tl, double x, double y)
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{
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// TODO have an implicit save/restore on each drawing functions instead? and is this correct?
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cairo_set_source_rgb(c->cr, 0.0, 0.0, 0.0);
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cairo_move_to(c->cr, x, y);
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pango_cairo_show_layout(c->cr, tl->layout);
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}
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void uiDrawTextLayoutExtents(uiDrawTextLayout *tl, double *width, double *height)
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{
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PangoRectangle logical;
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pango_layout_get_extents(tl->layout, NULL, &logical);
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*width = pangoToCairo(logical.width);
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*height = pangoToCairo(logical.height);
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}
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