Loading a font from a file to pango?
c, cairo, fonts, pango
Solution
This problem can be solved fairly easily by adding a custom font to the local fontconfig state:
#include <fontconfig/fontconfig.h>
std::string yourFontFilePath = "/home/testUser/bla.ttf";
const FcChar8 * file = (const FcChar8 *)yourFontFilePath.c_str();
FcBool fontAddStatus = FcConfigAppFontAddFile(FcConfigGetCurrent(), file);
Now the pango rendering engine will use your custom font just by using the PangoFontDescription.
Problem
I have a code uses Cairo and Pango to create an image : ``` #include<stdio.h> #include<cairo.h> #include<pango/pangocairo.h> #define IMAGE_WIDTH 650 #define IMAGE_HEIGHT 150 #define TEXT "HELLO WORLD" #define FONT "MizuFontAlphabet Normal 40" /* * $ gcc $(pkg-config pangocairo cairo --cflags --libs) file.c */ int main(int argc , char** argv) { cairo_surface_t *surface; cairo_t *cr; PangoLayout *layout; PangoFontDescription *desc; PangoRectangle extents; surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, IMAGE_WIDTH, IMAGE_HEIGHT); cr = cairo_create(surface); cairo_rectangle(cr, 0, 0, IMAGE_WIDTH, IMAGE_HEIGHT); cairo_set_source_rgb(cr, 0, 0, 0); cairo_fill(cr); cairo_stroke(cr); /* the font is needed to be installed in fonts directory */ layout = pango_cairo_create_layout(cr); pango_layout_set_text(layout, TEXT, -1); desc = pango_font_description_from_string(FONT); pango_layout_set_font_description(layout, desc); pango_font_description_free (desc); pango_layout_get_pixel_extents(layout, NULL, &extents); int x = (int) (IMAGE_WIDTH - extents.width) / 2; int y = (int) (IMAGE_HEIGHT - extents.height) / 2; cairo_set_source_rgb(cr, 0.33, 0.55, 0.88); cairo_move_to(cr, x, y); pango_cairo_show_layout(cr, layout); g_object_unref(layout); cairo_surface_write_to_png(surface, "image.png"); cairo_destroy(cr); cairo_surface_destroy(surface); return(0); } ``` The font I use , `MizuFontAlphabet`, is a none-standard font so it is needed to be installed in the fonts directory so I can use it with Pango : ``` desc = pango_font_description_from_string(FONT); ``` How could I load the font from a file in case that font wasn't installed?