Hojun-Cho
87cb03fdf8
popuplayout had two refit stages for a work area shorter than one padded row — 40 pixels — and popupdraw re-checked the layout it had just been handed, against an Imgh that bounded no buffer any more. Pango and Cairo abort rather than return nil, so textinit is void and the layout is never nil; the stride Cairo computes for RGB24 is w*4 by definition; and textdraw set the layout's width and ellipsis twice.
143 lines
3.4 KiB
C
143 lines
3.4 KiB
C
#include "dat.h"
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#include <fontconfig/fontconfig.h>
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#include <pango/pangocairo.h>
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#include "fn.h"
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static PangoFontMap *fontmap;
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static PangoContext *context;
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static PangoLayout *layout;
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void
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textclose(void)
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{
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if(layout != nil)
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g_object_unref(layout);
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if(context != nil)
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g_object_unref(context);
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if(fontmap != nil)
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g_object_unref(fontmap);
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layout = nil;
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context = nil;
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fontmap = nil;
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}
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static void
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setfont(void)
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{
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PangoFontDescription *font;
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PangoRectangle r;
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int size;
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font = pango_font_description_new();
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pango_font_description_set_family(font, "sans");
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pango_font_description_set_absolute_size(font, Fontsz * PANGO_SCALE);
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pango_layout_set_font_description(layout, font);
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pango_layout_set_text(layout, "Mg", -1);
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pango_layout_get_pixel_extents(layout, nil, &r);
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if(r.height > 0){
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/* Fontsz is the popup row height, not a point size. */
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size = Fontsz * PANGO_SCALE * Fontsz / r.height;
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pango_font_description_set_absolute_size(font, max(size, PANGO_SCALE));
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pango_layout_set_font_description(layout, font);
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}
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pango_font_description_free(font);
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}
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void
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textinit(void)
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{
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FcInit();
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fontmap = pango_cairo_font_map_new();
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pango_cairo_font_map_set_resolution(PANGO_CAIRO_FONT_MAP(fontmap), 96);
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context = pango_font_map_create_context(fontmap);
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layout = pango_layout_new(context);
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pango_layout_set_single_paragraph_mode(layout, TRUE);
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setfont();
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}
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static int
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settext(Str *s)
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{
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char utf[Maxutf];
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int n;
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n = stoutf(s, utf, sizeof utf);
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pango_layout_set_text(layout, utf, n);
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return n > 0;
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}
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static void
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textextents(PangoRectangle *r)
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{
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PangoRectangle ink, logical;
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int x0, y0, x1, y1;
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pango_layout_get_pixel_extents(layout, &ink, &logical);
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x0 = min(ink.x, logical.x);
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y0 = min(ink.y, logical.y);
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x1 = max(ink.x + ink.width, logical.x + logical.width);
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y1 = max(ink.y + ink.height, logical.y + logical.height);
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r->x = x0;
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r->y = y0;
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r->width = max(x1 - x0, 0);
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r->height = max(y1 - y0, 0);
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}
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int
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textwidth(Str *s)
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{
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PangoRectangle r;
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pango_layout_set_width(layout, -1);
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pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_NONE);
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if(!settext(s))
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return 0;
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textextents(&r);
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return r.width;
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}
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/*
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* Draws s at (x, y) into the w-by-h buffer, ellipsized to fit pixels and
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* clipped to its own row so a tall fallback face cannot paint a
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* neighbour.
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*/
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void
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textdraw(u32int *buf, int w, int h, int x, int y, int fit, u32int color,
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Str *s)
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{
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PangoRectangle r;
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cairo_surface_t *surface;
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cairo_t *cr;
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int b, g, red;
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if(fit <= 0)
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return;
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pango_layout_set_width(layout, fit * PANGO_SCALE);
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pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
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if(w <= 0 || h <= 0 || !settext(s))
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return;
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surface = cairo_image_surface_create_for_data((uchar*)buf,
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CAIRO_FORMAT_RGB24, w, h, w * sizeof buf[0]);
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if(cairo_surface_status(surface) != CAIRO_STATUS_SUCCESS){
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cairo_surface_destroy(surface);
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return;
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}
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cairo_surface_mark_dirty(surface);
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cr = cairo_create(surface);
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if(cairo_status(cr) == CAIRO_STATUS_SUCCESS){
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pango_cairo_update_layout(cr, layout);
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textextents(&r);
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cairo_rectangle(cr, x, y, fit, Fontsz);
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cairo_clip(cr);
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cairo_move_to(cr, x - r.x, y + (Fontsz - r.height) / 2 - r.y);
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red = color >> 16 & 0xff;
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g = color >> 8 & 0xff;
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b = color & 0xff;
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cairo_set_source_rgb(cr, red / 255.0, g / 255.0, b / 255.0);
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pango_cairo_show_layout(cr, layout);
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}
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cairo_destroy(cr);
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cairo_surface_flush(surface);
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cairo_surface_destroy(surface);
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}
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