X-Git-Url: https://git.cworth.org/git?a=blobdiff_plain;f=spritext.c;h=39c05a59cf3417056d899ea23acd245b840d500a;hb=678d5f954caab8fe81a86ef97f67288f0fca9511;hp=ef7c9a2470608cabd2542061d25fa47de45fdfb4;hpb=96d28dc64ae59b5312fd32404561c2307bad8b50;p=spritext

diff --git a/spritext.c b/spritext.c
index ef7c9a2..39c05a5 100644
--- a/spritext.c
+++ b/spritext.c
@@ -24,86 +24,124 @@ static cairo_status_t
 stdio_write (void *closure, const unsigned char *data, unsigned int length);
 #endif
 
-double
-get_max_width (cairo_t *cr, char *characters);
-
-double
-get_max_height (cairo_t *cr, char *characters);
-
-int
-main (void)
+static double
+get_max_width (cairo_t *cr, const char *characters)
 {
-    char outputJson = FALSE;
-
-    char characters[] = {
-	'!', '"', '#', '$', '%', '&','\'', '(',
-	')', '*', '+', ',', '-', '.', '/', '0',
-	'1', '2', '3', '4', '5', '6', '7', '8',
-	'9', ':', ';', '<', '=', '>', '?', '@',
-	'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
-	'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
-	'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
-	'Y', 'Z', '[','\\', ']', '^', '_', '`',
-	'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
-	'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p',
-	'q', 'r', 's', 't', 'u', 'v', 'w', 'x',
-	'y', 'z', '{', '|', '}', '~'
-    };
+    int i;
+    double max_width = 0.;
+    char string[2];
+    string[1] = '\0';
+    for (i = 0; i < ARRAY_SIZE(characters); i++) {
+	cairo_text_extents_t extents;
+	string[0] = characters[i];
+	cairo_text_extents (cr, string, &extents);
+	if ((extents.width + (extents.x_bearing * 2)) > max_width)
+	    max_width = extents.width + (extents.x_bearing * 2);
+    }
+    return max_width;
+}
 
+static double
+get_max_height (cairo_t *cr, const char *characters)
+{
     int i;
+    double max_height = 0.;
+    char string[2];
+    string[1] = '\0';
+    for (i = 0; i < ARRAY_SIZE(characters); i++) {
+	cairo_text_extents_t extents;
+	string[0] = characters[i];
+	cairo_text_extents (cr, string, &extents);
+//    if ((extents.height - extents.y_bearing) > max_height)
+//      max_height = extents.height - extents.y_bearing;
+	if ((extents.height) > max_height)
+	    max_height = extents.height;
+    }
+    return max_height;
+}
 
+typedef struct {
+    char *family;
+    double size;
+    struct {
+	double red;
+	double green;
+	double blue;
+    } color;
+} args_t;
+
+static void
+parse_args (args_t *args)
+{
+    /* First some defaults */
+    args->family = "Vera";
+    args->size = 20;
+    args->color.red = 0.0;
+    args->color.green = 0.0;
+    args->color.blue = 0.0;
+
+    /* XXX: Next, we should override the defaults based on
+     * command-line arguments. */
+
+    /* XXX: Finally, we'll want to allow CGI-based arguments as
+     * well. */
+#if USE_CGIG
     /* QueryString */
     int fontsize;
     char format[5];
     char fillcolor[20];
-
-#if USE_CGIG
     char fontname[20];
     cgiFormStringNoNewlines("fontname", fontname, 20);
     cgiFormInteger("fontsize", &fontsize, 50);
     cgiFormStringNoNewlines("format", format, 5);
     cgiFormStringNoNewlines("fillcolor", fillcolor, 20);
-#endif
 
     int fillcolor_red;
     int fillcolor_green;
     int fillcolor_blue;
     sscanf (fillcolor, " rgb : %d , %d , %d ", &fillcolor_red, &fillcolor_green, &fillcolor_blue);
-
     if ( format[0] == 'j' && format[1] == 's' && format[2] == 'o' && format[3] == 'n' )
 	outputJson = TRUE;
-
-#if USE_CGIC
-    if (outputJson)
-    {
-	cgiHeaderContentType("application/json");
-    } else {
-	cgiHeaderContentType("image/png");
-    }
 #endif
+}
+
+static FT_Face
+load_ft_face_for_family (const char *family)
+{
+    /* XXX: Instead of a hard-coded filename here, we should really be
+     * taking family and using fontconfig to map that to a
+     * filename. */
+    const char font_filename[] = "./Vera.ttf";
 
-    int error;  
+    int error;
+    FT_Face     ft_face;
     FT_Library 	library;
-    FT_Face 	ft_face;
-    FT_Bool     use_kerning;
-    FT_UInt     left_index, right_index;
-    FT_Vector   kerning;
 
     error = FT_Init_FreeType( &library );
-    if ( error )
-	printf("error");
+    if ( error ) {
+	fprintf (stderr, "Fatal error initializing freetype.\n");
+	exit (1);
+    }
 
-    error = FT_New_Face( library,"/srv/rdworth.org/cgi-bin/Verdana.ttf",
+    error = FT_New_Face( library, font_filename,
                          0,
                          &ft_face );
-    if ( error == FT_Err_Unknown_File_Format )
-        printf("File opened. Font format unsupported.");
-    else if ( error )
-        printf("Could not be open or read or broken.");
+    if ( error == FT_Err_Unknown_File_Format ) {
+        fprintf (stderr, "Unsupported font format: %s\n", font_filename);
+	exit (1);
+    } else if ( error ) {
+        fprintf (stderr, "Failed to open file: %s\n", font_filename);
+	exit (1);
+    }
 
-    use_kerning = FT_HAS_KERNING( ft_face );
+    return ft_face;
+}
 
-    /* Compute max-width and max-height */
+static void
+get_characters_max_width_height (FT_Face ft_face, double size,
+				 const char *characters,
+				 double *max_width, double *max_height)
+{
     cairo_surface_t *surface;
     cairo_t *cr;
     cairo_font_face_t *cr_face;
@@ -121,18 +159,69 @@ main (void)
     cr_face = cairo_ft_font_face_create_for_ft_face (ft_face, 0);
     cairo_set_font_face (cr, cr_face);
 
-    cairo_set_font_size (cr, fontsize);
+    cairo_set_font_size (cr, size);
 
     cairo_set_line_width (cr, 1.0);
 
-    double max_width = get_max_width(cr, characters);
-    double max_height = get_max_height(cr, characters);
+    *max_width = get_max_width(cr, characters);
+    *max_height = get_max_height(cr, characters);
 
     cairo_font_face_destroy (cr_face);
 
     cairo_destroy (cr);
 
     cairo_surface_destroy(surface);
+}
+
+int
+main (void)
+{
+    char outputJson = FALSE;
+
+    char characters[] = {
+	'!', '"', '#', '$', '%', '&','\'', '(',
+	')', '*', '+', ',', '-', '.', '/', '0',
+	'1', '2', '3', '4', '5', '6', '7', '8',
+	'9', ':', ';', '<', '=', '>', '?', '@',
+	'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
+	'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
+	'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
+	'Y', 'Z', '[','\\', ']', '^', '_', '`',
+	'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
+	'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p',
+	'q', 'r', 's', 't', 'u', 'v', 'w', 'x',
+	'y', 'z', '{', '|', '}', '~'
+    };
+
+    int i;
+    args_t args;
+    FT_Face ft_face;
+    FT_UInt     left_index, right_index;
+    FT_Bool     use_kerning;
+    FT_Vector   kerning;
+    double max_width, max_height;
+    cairo_surface_t *surface;
+    cairo_t *cr;
+    cairo_font_face_t *cr_face;
+
+    parse_args (&args);
+
+#if USE_CGIC
+    if (outputJson)
+    {
+	cgiHeaderContentType("application/json");
+    } else {
+	cgiHeaderContentType("image/png");
+    }
+#endif
+
+    ft_face = load_ft_face_for_family (args.family);
+
+    use_kerning = FT_HAS_KERNING( ft_face );
+
+    get_characters_max_width_height (ft_face, args.size,
+				     characters,
+				     &max_width, &max_height);
 
     /* Draw */
     surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
@@ -149,7 +238,7 @@ main (void)
     cr_face = cairo_ft_font_face_create_for_ft_face (ft_face, 0);
     cairo_set_font_face (cr, cr_face);
 
-    cairo_set_font_size (cr, fontsize);
+    cairo_set_font_size (cr, args.size);
 
     cairo_text_extents_t extents;
     double x = 0.0;
@@ -205,10 +294,10 @@ main (void)
   
 	cairo_move_to (cr, x, y);
 	cairo_set_source_rgb (cr, 0., 0., 0.); // black
-	if ( 0 <= fillcolor_red && fillcolor_red <= 255.0
-	     && 0 <= fillcolor_green && fillcolor_green <= 255.0
-	     && 0 <= fillcolor_blue && fillcolor_blue <= 255.0 )
-	    cairo_set_source_rgb (cr, fillcolor_red / 255.0, fillcolor_green / 255.0, fillcolor_blue / 255.0);
+	cairo_set_source_rgb (cr,
+			      args.color.red,
+			      args.color.green,
+			      args.color.blue);
 	cairo_text_path (cr, string);
 	cairo_fill (cr);
 
@@ -291,6 +380,9 @@ cairo_pattern_destroy (gradient);
     }
 #endif
 
+    cairo_surface_write_to_png (surface, "spritext-output.png");
+    printf ("Result written to spritext-output.png\n");
+
     cairo_destroy (cr);
 
     cairo_surface_destroy (surface);
@@ -309,40 +401,3 @@ stdio_write (void *closure, const unsigned char *data, unsigned int length)
 	return CAIRO_STATUS_WRITE_ERROR;
 }
 #endif
-
-double
-get_max_width(cairo_t *cr, char *characters)
-{
-    int i;
-    double max_width = 0.;
-    char string[2];
-    string[1] = '\0';
-    for (i = 0; i < ARRAY_SIZE(characters); i++) {
-	cairo_text_extents_t extents;
-	string[0] = characters[i];
-	cairo_text_extents (cr, string, &extents);
-	if ((extents.width + (extents.x_bearing * 2)) > max_width)
-	    max_width = extents.width + (extents.x_bearing * 2);
-    }
-    return max_width;
-}
-
-double
-get_max_height(cairo_t *cr, char *characters)
-{
-    int i;
-    double max_height = 0.;
-    char string[2];
-    string[1] = '\0';
-    for (i = 0; i < ARRAY_SIZE(characters); i++) {
-	cairo_text_extents_t extents;
-	string[0] = characters[i];
-	cairo_text_extents (cr, string, &extents);
-//    if ((extents.height - extents.y_bearing) > max_height)
-//      max_height = extents.height - extents.y_bearing;
-	if ((extents.height) > max_height)
-	    max_height = extents.height;
-    }
-    return max_height;
-}
-