Changeset 549Tweet

Timestamp:

Apr 29, 2011, 12:24:43 AM (10 years ago)

Author:

Sam Hocevar

Message:

imlib: bring back the old PCX reading code.

Location:

abuse/trunk/src/imlib

Files:

• pcxread.cpp (modified) (3 diffs)
• pcxread.h (modified) (1 diff)

abuse/trunk/src/imlib/pcxread.cpp

@@ -16 +16 @@
 #include "specs.h"
 
+enum PCX_type { not_PCX, PCX_8, PCX_24 };
+
 struct PCX_header_type
 {
@@ -25 +27 @@
   char filter[58];
 } PCX_header;
+
+int read_PCX_header(FILE *fp)
+{
+  if (!fread(&PCX_header.manufactururer,1,1,fp)) return 0;
+  if (!fread(&PCX_header.version,1,1,fp)) return 0;
+  if (!fread(&PCX_header.encoding,1,1,fp)) return 0;
+  if (!fread(&PCX_header.bits_per_pixel,1,1,fp)) return 0;
+  PCX_header.xmin=read_uint16(fp);
+  PCX_header.ymin=read_uint16(fp);
+  PCX_header.xmax=read_uint16(fp);
+  PCX_header.ymax=read_uint16(fp);
+  PCX_header.hres=read_uint16(fp);
+  PCX_header.vres=read_uint16(fp);
+  if (!fread(PCX_header.palette,1,48,fp)) return 0;
+  if (!fread(&PCX_header.reserved,1,1,fp)) return 0;
+  if (!fread(&PCX_header.color_planes,1,1,fp)) return 0;
+  PCX_header.bytes_per_line=read_uint16(fp);
+  PCX_header.palette_type=read_uint16(fp);
+  if (!fread(PCX_header.filter,1,58,fp)) return 0;
+  return 1;
+}
 
 int write_PCX_header(FILE *fp)
@@ -47 +70 @@
 }
 
+PCX_type PCX_file_type(char const *filename)
+{
+  FILE *fp=fopen(filename,"rb");
+  if (!fp)
+    return not_PCX;
+
+  if (!read_PCX_header(fp))
+  {
+    fclose(fp);
+    return not_PCX;
+  }
+  fclose(fp);
+  if (PCX_header.manufactururer!=10)
+    return not_PCX;
+  if (PCX_header.color_planes==3 && PCX_header.bits_per_pixel==8)
+    return PCX_24;
+  else if (PCX_header.color_planes==1 && PCX_header.bits_per_pixel==8)
+    return PCX_8;
+  else return not_PCX;
+}
+
+void read_PCX_line(FILE *fp, unsigned char *start, short skip, int width)
+{
+  int c,n=0,i;
+
+  do
+  {
+    c=fgetc(fp)&0xff;
+    if ((c&0xc0)==0xc0)
+    {
+      i=c&0x3f;
+      c=fgetc(fp);
+      while (i--)
+      {
+    *start=c;
+    start+=skip;
+        n++;
+      }
+    }
+    else
+    {
+      *start=c;
+      start+=skip;
+      n++;
+    }
+  } while (n<width);
+}
+
+image *read_PCX(char const *filename, palette *&pal)
+{
+  if (PCX_file_type(filename)!=PCX_8) return NULL;
+  FILE *fp=fopen(filename,"rb");
+  read_PCX_header(fp);
+
+  image *im=new image(vec2i(PCX_header.xmax-PCX_header.xmin+1,
+                            PCX_header.ymax-PCX_header.ymin+1));
+  int y;
+  for (y=0;y<im->Size().y;y++)
+    read_PCX_line(fp,im->scan_line(y),1,PCX_header.bytes_per_line);
+  unsigned char palette_confirm;
+  if (!fread(&palette_confirm,1,1,fp) || palette_confirm!=12)
+  {
+    pal=new palette;
+    pal->defaults();
+  }
+  else
+  {
+    pal=new palette;
+    fread(pal->addr(),1,256*3,fp);
+  }
+  fclose(fp);
+  return im;
+}
+
 void write_PCX(image *im, palette *pal, char const *filename)
 {

abuse/trunk/src/imlib/pcxread.h

@@ -16 +16 @@
 
 void write_PCX(image *im, palette *pal, char const *filename);
+image *read_PCX(char const *filename, palette *&pal);
 
 #endif