An example of using the ft2 module

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);
+	}
+    }
+}