+++ /dev/null
-/***********************************************************
-* Rocks'n'Diamonds -- McDuffin Strikes Back! *
-*----------------------------------------------------------*
-* (c) 1995-98 Artsoft Entertainment *
-* Holger Schemel *
-* Oststrasse 11a *
-* 33604 Bielefeld *
-* phone: ++49 +521 290471 *
-* email: aeglos@valinor.owl.de *
-*----------------------------------------------------------*
-* pcx.c *
-***********************************************************/
-
-#ifndef TARGET_SDL
-
-#include "pcx.h"
-#include "image.h"
-#include "misc.h"
-
-#define PCX_DEBUG FALSE
-
-#define PCX_MAGIC 0x0a /* first byte in a PCX image file */
-#define PCX_LAST_VERSION 5 /* last acceptable version number */
-#define PCX_ENCODING 1 /* PCX encoding method */
-#define PCX_256COLORS_MAGIC 0x0c /* first byte of a PCX 256 color map */
-#define PCX_MAXDEPTH 8 /* supports up to 8 bits per pixel */
-#define PCX_MAXCOLORS 256 /* maximum number of colors */
-
-#define PCX_HEADER_SIZE 128
-#define PCX_COLORMAP_SIZE (3 * PCX_MAXCOLORS)
-
-struct PCX_Header
-{
- unsigned char signature; /* PCX file identifier */
- unsigned char version; /* version compatibility level */
- unsigned char encoding; /* encoding method */
- unsigned char bits_per_pixel; /* bits per pixel, or depth */
- unsigned short xmin; /* X position of left edge */
- unsigned short ymin; /* Y position of top edge */
- unsigned short xmax; /* X position of right edge */
- unsigned short ymax; /* Y position of bottom edge */
- unsigned short hres; /* X screen resolution of source image */
- unsigned short vres; /* Y screen resolution of source image */
- unsigned char palette[16][3]; /* PCX color map */
- unsigned char reserved; /* should be 0, 1 if std res fax */
- unsigned char color_planes; /* bit planes in image */
- unsigned short bytes_per_line;/* byte delta between scanlines */
- unsigned short palette_type; /* 0 = undef, 1 = color, 2 = grayscale */
- unsigned char filler[58]; /* fill to struct size of 128 */
-};
-
-/* global PCX error value */
-int errno_pcx = PCX_Success;
-
-static byte *PCX_ReadBitmap(Image *image, byte *buffer_ptr, byte *buffer_last)
-{
- /* Run Length Encoding: If the two high bits are set,
- * then the low 6 bits contain a repeat count, and the byte to
- * repeat is the next byte in the file. If the two high bits are
- * not set, then this is the byte to write.
- */
-
- unsigned int bytes_per_pixel = (image->depth + 7) / 8;
- register byte *bitmap_ptr, *bitmap_last;
- register byte value, count;
-
- bitmap_ptr = image->data;
- bitmap_last = bitmap_ptr + (image->width * image->height * bytes_per_pixel);
-
- while (bitmap_ptr < bitmap_last && buffer_ptr < buffer_last)
- {
- value = *buffer_ptr++;
-
- if ((value & 0xc0) == 0xc0) /* this is a repeat count byte */
- {
- count = value & 0x3f; /* extract repeat count from byte */
- value = *buffer_ptr++; /* next byte is value to repeat */
-
- for (; count && bitmap_ptr < bitmap_last; count--)
- *bitmap_ptr++ = value;
-
- if (count) /* repeat count spans end of bitmap */
- return NULL;
- }
- else
- *bitmap_ptr++ = value;
-
- image->rgb.color_used[value] = TRUE;
- }
-
- /* check if end of buffer was reached before end of bitmap */
- if (bitmap_ptr < bitmap_last)
- return NULL;
-
- /* return current buffer position for next decoding function */
- return buffer_ptr;
-}
-
-static byte *PCX_ReadColormap(Image *image,byte *buffer_ptr, byte *buffer_last)
-{
- int i, magic;
-
- /* read colormap magic byte */
- magic = *buffer_ptr++;
-
- /* check magic colormap header byte */
- if (magic != PCX_256COLORS_MAGIC)
- return NULL;
-
- /* check if enough bytes left for a complete colormap */
- if (buffer_ptr + PCX_COLORMAP_SIZE > buffer_last)
- return NULL;
-
- /* read 256 colors from PCX colormap */
- for (i=0; i<PCX_MAXCOLORS; i++)
- {
- image->rgb.red[i] = *buffer_ptr++ << 8;
- image->rgb.green[i] = *buffer_ptr++ << 8;
- image->rgb.blue[i] = *buffer_ptr++ << 8;
- }
-
- /* return current buffer position for next decoding function */
- return buffer_ptr;
-}
-
-Image *Read_PCX_to_Image(char *filename)
-{
- FILE *file;
- byte *file_buffer;
- byte *buffer_ptr, *buffer_last;
- unsigned int file_length;
- struct PCX_Header pcx;
- Image *image;
- int width, height, depth;
- int i;
-
- errno_pcx = PCX_Success;
-
- if (!(file = fopen(filename, "r")))
- {
- errno_pcx = PCX_OpenFailed;
- return NULL;
- }
-
- if (fseek(file, 0, SEEK_END) == -1)
- {
- fclose(file);
- errno_pcx = PCX_ReadFailed;
- return NULL;
- }
-
- file_length = ftell(file);
- rewind(file);
-
- if (file_length < PCX_HEADER_SIZE)
- {
- /* PCX file is too short to contain a valid PCX header */
- fclose(file);
-
- errno_pcx = PCX_FileInvalid;
- return NULL;
- }
-
- file_buffer = checked_malloc(file_length);
-
- if (fread(file_buffer, 1, file_length, file) != file_length)
- {
- fclose(file);
- errno_pcx = PCX_ReadFailed;
- return NULL;
- }
-
- fclose(file);
-
- pcx.signature = file_buffer[0];
- pcx.version = file_buffer[1];
- pcx.encoding = file_buffer[2];
- pcx.bits_per_pixel = file_buffer[3];
- pcx.xmin = file_buffer[4] + 256 * file_buffer[5];
- pcx.ymin = file_buffer[6] + 256 * file_buffer[7];
- pcx.xmax = file_buffer[8] + 256 * file_buffer[9];
- pcx.ymax = file_buffer[10] + 256 * file_buffer[11];
- pcx.color_planes = file_buffer[65];
- pcx.bytes_per_line = file_buffer[66] + 256 * file_buffer[67];
- pcx.palette_type = file_buffer[68] + 256 * file_buffer[69];
-
- width = pcx.xmax - pcx.xmin + 1;
- height = pcx.ymax - pcx.ymin + 1;
- depth = pcx.bits_per_pixel;
-
- if (pcx.signature != PCX_MAGIC || pcx.version > PCX_LAST_VERSION ||
- pcx.encoding != PCX_ENCODING || pcx.color_planes > PCX_MAXDEPTH ||
- width < 0 || height < 0)
- {
- free(file_buffer);
-
- errno_pcx = PCX_FileInvalid;
- return NULL;
- }
-
-#if PCX_DEBUG
- if (options.verbose)
- {
- printf("%s is a %dx%d PC Paintbrush image with %d bitplanes\n",
- filename, width, height,
- pcx.color_planes);
- printf("depth: %d\n", pcx.bits_per_pixel);
- printf("color_planes: %d\n", pcx.color_planes);
- printf("bytes_per_line: %d\n", pcx.bytes_per_line);
- printf("palette type: %s\n",
- (pcx.palette_type == 1 ? "color" :
- pcx.palette_type == 2 ? "grayscale" : "undefined"));
- }
-#endif
-
- /* allocate new image structure */
- image = newImage(width, height, depth);
-
- buffer_ptr = file_buffer + PCX_HEADER_SIZE;
- buffer_last = file_buffer + file_length;
-
- /* read compressed bitmap data */
- if ((buffer_ptr = PCX_ReadBitmap(image, buffer_ptr, buffer_last)) == NULL)
- {
- free(file_buffer);
- freeImage(image);
-
- errno_pcx = PCX_FileInvalid;
- return NULL;
- }
-
- if (file_length < PCX_HEADER_SIZE + PCX_COLORMAP_SIZE)
- {
- /* PCX file is too short to contain a valid 256 colors colormap */
- fclose(file);
- errno_pcx = PCX_ColorFailed;
- return NULL;
- }
-
- /* read colormap data */
- if (!PCX_ReadColormap(image, buffer_ptr, buffer_last))
- {
- free(file_buffer);
- freeImage(image);
- errno_pcx = PCX_ColorFailed;
- return NULL;
- }
-
- free(file_buffer);
-
- /* determine number of used colormap entries */
- image->rgb.used = 0;
- for (i=0; i<PCX_MAXCOLORS; i++)
- if (image->rgb.color_used[i])
- image->rgb.used++;
-
-#if PCX_DEBUG
- if (options.verbose)
- printf("Read_PCX_to_Image: %d colors found\n", image->rgb.used);
-#endif
-
- return image;
-}
-
-#endif /* !TARGET_SDL */
projects / rocksndiamonds.git / blobdiff