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authorDov Grobgeld <dov@src.gnome.org>2002-01-17 22:01:34 +0000
committerDov Grobgeld <dov@src.gnome.org>2002-01-17 22:01:34 +0000
commitb9a76caed99a31d11a9582c7bffc27f0ca1774a8 (patch)
tree2babc6ac46b94237b61373bc195291c5da747b2c /examples
parent3de085b6ad7548fd1de150f872a62b4dea370c68 (diff)
downloadpango-b9a76caed99a31d11a9582c7bffc27f0ca1774a8.tar.gz
An example of using the ft2 module
Diffstat (limited to 'examples')
-rw-r--r--examples/pangoft2topgm.c273
-rw-r--r--examples/renderdemo.c273
2 files changed, 546 insertions, 0 deletions
diff --git a/examples/pangoft2topgm.c b/examples/pangoft2topgm.c
new file mode 100644
index 00000000..fe849060
--- /dev/null
+++ b/examples/pangoft2topgm.c
@@ -0,0 +1,273 @@
+/* Pango
+ * pangoft2topgm.c: Example program to view a UTF-8 encoding file
+ * using Pango to render result.
+ *
+ * Copyright (C) 1999 Red Hat Software
+ * Copyright (C) 2001 Sun Microsystems
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#define BUFSIZE 1024
+#define MALLOCSIZE 1024
+
+#include <pango/pango.h>
+#include <pango/pangoft2.h>
+
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+char *prog_name = NULL;
+typedef struct _Paragraph Paragraph;
+
+/* Structure representing a paragraph
+ */
+struct _Paragraph {
+ char *text;
+ int length;
+ int height; /* Height, in pixels */
+ PangoLayout *layout;
+};
+
+GList *paragraphs;
+
+static PangoFontDescription *font_description;
+static Paragraph *highlight_para;
+static int highlight_offset;
+
+PangoContext *context;
+
+/* Read an entire file into a string
+ */
+static char *
+read_file (char *name)
+{
+ GString *inbuf;
+ FILE *file;
+ char *text;
+ char buffer[BUFSIZE];
+
+ file = fopen (name, "r");
+ if (!file)
+ {
+ fprintf (stderr, "%s: Cannot open %s\n", g_get_prgname (), name);
+ return NULL;
+ }
+
+ inbuf = g_string_new (NULL);
+ while (1)
+ {
+ char *bp = fgets (buffer, BUFSIZE-1, file);
+ if (ferror (file))
+ {
+ fprintf(stderr, "%s: Error reading %s\n", g_get_prgname (), name);
+ g_string_free (inbuf, TRUE);
+ return NULL;
+ }
+ else if (bp == NULL)
+ break;
+
+ g_string_append (inbuf, buffer);
+ }
+
+ fclose (file);
+
+ text = inbuf->str;
+ g_string_free (inbuf, FALSE);
+
+ return text;
+}
+
+/* Take a UTF8 string and break it into paragraphs on \n characters
+ */
+static GList *
+split_paragraphs (char *text)
+{
+ char *p = text;
+ char *next;
+ gunichar wc;
+ GList *result = NULL;
+ char *last_para = text;
+
+ while (*p)
+ {
+ wc = g_utf8_get_char (p);
+ next = g_utf8_next_char (p);
+ if (wc == (gunichar)-1)
+ {
+ fprintf (stderr, "%s: Invalid character in input\n", g_get_prgname ());
+ wc = 0;
+ }
+ if (!*p || !wc || wc == '\n')
+ {
+ Paragraph *para = g_new (Paragraph, 1);
+ para->text = last_para;
+ para->length = p - last_para;
+ para->layout = pango_layout_new (context);
+ pango_layout_set_text (para->layout, para->text, para->length);
+ para->height = 0;
+
+ last_para = next;
+
+ result = g_list_prepend (result, para);
+ }
+ if (!wc) /* incomplete character at end */
+ break;
+ p = next;
+ }
+
+ return g_list_reverse (result);
+}
+
+int main(int argc, char *argv[])
+{
+ int dpi_x = 100, dpi_y = 100;
+ char *init_family = "sans";
+ int init_scale = 24;
+ PangoDirection init_dir = PANGO_DIRECTION_LTR;
+ char *text;
+ int y_start = 0, x_start = 0;
+ int paint_width = 500;
+ int paint_height = 500;
+ int argp;
+
+ g_type_init();
+
+ /* Parse command line */
+ argp=1;
+ while(argp < argc && argv[argp][0] == '-')
+ {
+ char *opt = argv[argp++];
+ if (strcmp(opt, "--help") == 0)
+ {
+ char *prog_name = g_get_prgname();
+ printf("%s - An example viewer for the pango ft2 extension\n"
+ "\n"
+ "Syntax:\n"
+ " %s [--family f] [--scale s] file\n"
+ "\n"
+ "Options:\n"
+ " --family f Set the initial family. Default is '%s'.\n"
+ " --scale s Set the initial scale. Default is %d\n",
+ " --rtl Set base dir to RTL. Default is LTR.\n",
+ " --width Width of drawing window. Default is 500.\n",
+ prog_name, prog_name, init_family, init_scale);
+ exit(0);
+ }
+ if (strcmp(opt, "--family") == 0)
+ {
+ init_family = argv[argp++];
+ continue;
+ }
+ if (strcmp(opt, "--scale") == 0)
+ {
+ init_scale = atoi(argv[argp++]);
+ continue;
+ }
+ if (strcmp(opt, "--rtl") == 0)
+ {
+ init_dir = PANGO_DIRECTION_RTL;
+ continue;
+ }
+ if (strcmp(opt, "--width") == 0)
+ {
+ paint_width = atoi(argv[argp++]);
+ continue;
+ }
+ fprintf(stderr, "Unknown option %s!\n", opt);
+ exit(1);
+ }
+
+ if (argp + 1 != argc)
+ {
+ fprintf (stderr, "Usage: %s [options] FILE\n", g_get_prgname());
+ exit(1);
+ }
+
+ /* Create the list of paragraphs from the supplied file
+ */
+ text = read_file (argv[argp++]);
+ if (!text)
+ exit(1);
+
+ context = pango_ft2_get_context (dpi_x, dpi_y);
+
+ paragraphs = split_paragraphs (text);
+
+ pango_context_set_language (context, pango_language_from_string ("en_US"));
+ pango_context_set_base_dir (context, init_dir);
+
+ font_description = pango_font_description_new ();
+ pango_font_description_set_family (font_description, g_strdup (init_family));
+ pango_font_description_set_style (font_description, PANGO_STYLE_NORMAL);
+ pango_font_description_set_variant (font_description, PANGO_VARIANT_NORMAL);
+ pango_font_description_set_weight (font_description, PANGO_WEIGHT_NORMAL);
+ pango_font_description_set_stretch (font_description, PANGO_STRETCH_NORMAL);
+ pango_font_description_set_size (font_description, init_scale * PANGO_SCALE);
+
+ pango_context_set_font_description (context, font_description);
+
+ /* Write first paragraph as a pgm file */
+ {
+ Paragraph *para = paragraphs->data;
+ int height = 0;
+ PangoDirection base_dir = pango_context_get_base_dir (context);
+ PangoRectangle logical_rect;
+
+ pango_layout_set_alignment (para->layout,
+ base_dir == PANGO_DIRECTION_LTR ? PANGO_ALIGN_LEFT : PANGO_ALIGN_RIGHT);
+ pango_layout_set_width (para->layout, paint_width * PANGO_SCALE);
+
+ pango_layout_get_extents (para->layout, NULL, &logical_rect);
+ para->height = PANGO_PIXELS (logical_rect.height);
+
+
+ if (height + para->height >= y_start)
+ {
+ FT_Bitmap bitmap;
+ guchar *buf = g_malloc (paint_width * para->height);
+
+ memset (buf, 0x00, paint_width * para->height);
+ bitmap.rows = para->height;
+ bitmap.width = paint_width;
+ bitmap.pitch = bitmap.width;
+ bitmap.buffer = buf;
+ bitmap.num_grays = 256;
+ bitmap.pixel_mode = ft_pixel_mode_grays;
+
+ pango_ft2_render_layout (&bitmap, para->layout,
+ x_start, 0);
+
+ /* Invert bitmap to get black text on white background */
+ {
+ int pix_idx;
+ for (pix_idx=0; pix_idx<paint_width * para->height; pix_idx++)
+ {
+ buf[pix_idx] = 255-buf[pix_idx];
+ }
+ }
+
+ /* Write it as pgm to output */
+ printf("P5\n"
+ "%d %d\n"
+ "255\n", bitmap.width, bitmap.rows);
+ fwrite(bitmap.buffer, 1, bitmap.width * bitmap.rows, stdout);
+ g_free (buf);
+ }
+ }
+}
diff --git a/examples/renderdemo.c b/examples/renderdemo.c
new file mode 100644
index 00000000..fe849060
--- /dev/null
+++ b/examples/renderdemo.c
@@ -0,0 +1,273 @@
+/* Pango
+ * pangoft2topgm.c: Example program to view a UTF-8 encoding file
+ * using Pango to render result.
+ *
+ * Copyright (C) 1999 Red Hat Software
+ * Copyright (C) 2001 Sun Microsystems
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#define BUFSIZE 1024
+#define MALLOCSIZE 1024
+
+#include <pango/pango.h>
+#include <pango/pangoft2.h>
+
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+char *prog_name = NULL;
+typedef struct _Paragraph Paragraph;
+
+/* Structure representing a paragraph
+ */
+struct _Paragraph {
+ char *text;
+ int length;
+ int height; /* Height, in pixels */
+ PangoLayout *layout;
+};
+
+GList *paragraphs;
+
+static PangoFontDescription *font_description;
+static Paragraph *highlight_para;
+static int highlight_offset;
+
+PangoContext *context;
+
+/* Read an entire file into a string
+ */
+static char *
+read_file (char *name)
+{
+ GString *inbuf;
+ FILE *file;
+ char *text;
+ char buffer[BUFSIZE];
+
+ file = fopen (name, "r");
+ if (!file)
+ {
+ fprintf (stderr, "%s: Cannot open %s\n", g_get_prgname (), name);
+ return NULL;
+ }
+
+ inbuf = g_string_new (NULL);
+ while (1)
+ {
+ char *bp = fgets (buffer, BUFSIZE-1, file);
+ if (ferror (file))
+ {
+ fprintf(stderr, "%s: Error reading %s\n", g_get_prgname (), name);
+ g_string_free (inbuf, TRUE);
+ return NULL;
+ }
+ else if (bp == NULL)
+ break;
+
+ g_string_append (inbuf, buffer);
+ }
+
+ fclose (file);
+
+ text = inbuf->str;
+ g_string_free (inbuf, FALSE);
+
+ return text;
+}
+
+/* Take a UTF8 string and break it into paragraphs on \n characters
+ */
+static GList *
+split_paragraphs (char *text)
+{
+ char *p = text;
+ char *next;
+ gunichar wc;
+ GList *result = NULL;
+ char *last_para = text;
+
+ while (*p)
+ {
+ wc = g_utf8_get_char (p);
+ next = g_utf8_next_char (p);
+ if (wc == (gunichar)-1)
+ {
+ fprintf (stderr, "%s: Invalid character in input\n", g_get_prgname ());
+ wc = 0;
+ }
+ if (!*p || !wc || wc == '\n')
+ {
+ Paragraph *para = g_new (Paragraph, 1);
+ para->text = last_para;
+ para->length = p - last_para;
+ para->layout = pango_layout_new (context);
+ pango_layout_set_text (para->layout, para->text, para->length);
+ para->height = 0;
+
+ last_para = next;
+
+ result = g_list_prepend (result, para);
+ }
+ if (!wc) /* incomplete character at end */
+ break;
+ p = next;
+ }
+
+ return g_list_reverse (result);
+}
+
+int main(int argc, char *argv[])
+{
+ int dpi_x = 100, dpi_y = 100;
+ char *init_family = "sans";
+ int init_scale = 24;
+ PangoDirection init_dir = PANGO_DIRECTION_LTR;
+ char *text;
+ int y_start = 0, x_start = 0;
+ int paint_width = 500;
+ int paint_height = 500;
+ int argp;
+
+ g_type_init();
+
+ /* Parse command line */
+ argp=1;
+ while(argp < argc && argv[argp][0] == '-')
+ {
+ char *opt = argv[argp++];
+ if (strcmp(opt, "--help") == 0)
+ {
+ char *prog_name = g_get_prgname();
+ printf("%s - An example viewer for the pango ft2 extension\n"
+ "\n"
+ "Syntax:\n"
+ " %s [--family f] [--scale s] file\n"
+ "\n"
+ "Options:\n"
+ " --family f Set the initial family. Default is '%s'.\n"
+ " --scale s Set the initial scale. Default is %d\n",
+ " --rtl Set base dir to RTL. Default is LTR.\n",
+ " --width Width of drawing window. Default is 500.\n",
+ prog_name, prog_name, init_family, init_scale);
+ exit(0);
+ }
+ if (strcmp(opt, "--family") == 0)
+ {
+ init_family = argv[argp++];
+ continue;
+ }
+ if (strcmp(opt, "--scale") == 0)
+ {
+ init_scale = atoi(argv[argp++]);
+ continue;
+ }
+ if (strcmp(opt, "--rtl") == 0)
+ {
+ init_dir = PANGO_DIRECTION_RTL;
+ continue;
+ }
+ if (strcmp(opt, "--width") == 0)
+ {
+ paint_width = atoi(argv[argp++]);
+ continue;
+ }
+ fprintf(stderr, "Unknown option %s!\n", opt);
+ exit(1);
+ }
+
+ if (argp + 1 != argc)
+ {
+ fprintf (stderr, "Usage: %s [options] FILE\n", g_get_prgname());
+ exit(1);
+ }
+
+ /* Create the list of paragraphs from the supplied file
+ */
+ text = read_file (argv[argp++]);
+ if (!text)
+ exit(1);
+
+ context = pango_ft2_get_context (dpi_x, dpi_y);
+
+ paragraphs = split_paragraphs (text);
+
+ pango_context_set_language (context, pango_language_from_string ("en_US"));
+ pango_context_set_base_dir (context, init_dir);
+
+ font_description = pango_font_description_new ();
+ pango_font_description_set_family (font_description, g_strdup (init_family));
+ pango_font_description_set_style (font_description, PANGO_STYLE_NORMAL);
+ pango_font_description_set_variant (font_description, PANGO_VARIANT_NORMAL);
+ pango_font_description_set_weight (font_description, PANGO_WEIGHT_NORMAL);
+ pango_font_description_set_stretch (font_description, PANGO_STRETCH_NORMAL);
+ pango_font_description_set_size (font_description, init_scale * PANGO_SCALE);
+
+ pango_context_set_font_description (context, font_description);
+
+ /* Write first paragraph as a pgm file */
+ {
+ Paragraph *para = paragraphs->data;
+ int height = 0;
+ PangoDirection base_dir = pango_context_get_base_dir (context);
+ PangoRectangle logical_rect;
+
+ pango_layout_set_alignment (para->layout,
+ base_dir == PANGO_DIRECTION_LTR ? PANGO_ALIGN_LEFT : PANGO_ALIGN_RIGHT);
+ pango_layout_set_width (para->layout, paint_width * PANGO_SCALE);
+
+ pango_layout_get_extents (para->layout, NULL, &logical_rect);
+ para->height = PANGO_PIXELS (logical_rect.height);
+
+
+ if (height + para->height >= y_start)
+ {
+ FT_Bitmap bitmap;
+ guchar *buf = g_malloc (paint_width * para->height);
+
+ memset (buf, 0x00, paint_width * para->height);
+ bitmap.rows = para->height;
+ bitmap.width = paint_width;
+ bitmap.pitch = bitmap.width;
+ bitmap.buffer = buf;
+ bitmap.num_grays = 256;
+ bitmap.pixel_mode = ft_pixel_mode_grays;
+
+ pango_ft2_render_layout (&bitmap, para->layout,
+ x_start, 0);
+
+ /* Invert bitmap to get black text on white background */
+ {
+ int pix_idx;
+ for (pix_idx=0; pix_idx<paint_width * para->height; pix_idx++)
+ {
+ buf[pix_idx] = 255-buf[pix_idx];
+ }
+ }
+
+ /* Write it as pgm to output */
+ printf("P5\n"
+ "%d %d\n"
+ "255\n", bitmap.width, bitmap.rows);
+ fwrite(bitmap.buffer, 1, bitmap.width * bitmap.rows, stdout);
+ g_free (buf);
+ }
+ }
+}