+++ /dev/null
-/***********************************************************
-* Artsoft Retro-Game Library *
-*----------------------------------------------------------*
-* (c) 1994-2006 Artsoft Entertainment *
-* Holger Schemel *
-* Detmolder Strasse 189 *
-* 33604 Bielefeld *
-* Germany *
-* e-mail: info@artsoft.org *
-*----------------------------------------------------------*
-* pcx.c *
-***********************************************************/
-
-#include "pcx.h"
-#include "misc.h"
-
-
-#if !defined(TARGET_SDL)
-
-#define PCX_DEBUG 0
-
-#define PCX_MAGIC 0x0a /* first byte in a PCX image file */
-#define PCX_SUPPORTED_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_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 (not 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; /* "color 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 boolean PCX_ReadBitmap(FILE *file, struct PCX_Header *pcx, Image *image)
-{
- int width = image->width;
- int height = image->height;
- int pcx_depth = pcx->bits_per_pixel * pcx->color_planes;
- int bytes_per_row = pcx->color_planes * pcx->bytes_per_line;
- byte *row_buffer = checked_malloc(bytes_per_row);
- byte *bitmap_ptr = image->data;
- int y;
-
- for (y = 0; y < height; y++)
- {
- /* decode a scan line into a temporary buffer first */
- byte *dst_ptr = (pcx_depth == 8 ? bitmap_ptr : row_buffer);
- byte value = 0, count = 0;
- int value_int;
- int i;
-
- for (i = 0; i < bytes_per_row; i++)
- {
- if (count == 0)
- {
- if ((value_int = fgetc(file)) == EOF)
- {
- free(row_buffer);
- return FALSE;
- }
-
- value = (byte)value_int;
-
- if ((value & 0xc0) == 0xc0) /* this is a repeat count byte */
- {
- count = value & 0x3f; /* extract repeat count from byte */
-
- if ((value_int = fgetc(file)) == EOF)
- {
- free(row_buffer);
- return FALSE;
- }
-
- value = (byte)value_int;
- }
- else
- count = 1;
- }
-
- dst_ptr[i] = value;
- count--;
-
- if (pcx_depth == 8)
- image->rgb.color_used[value] = TRUE;
- }
-
- if (pcx_depth <= 4) /* expand planes to 1 byte/pixel */
- {
- byte *src_ptr = row_buffer;
- int plane;
-
- for (plane = 0; plane < pcx->color_planes; plane++)
- {
- int i, j, x = 0;
-
- for (i = 0; i < pcx->bytes_per_line; i++)
- {
- byte value = *src_ptr++;
-
- for (j = 7; j >= 0; j--)
- {
- byte bit = (value >> j) & 1;
-
- if (i * 8 + j >= width) /* skip padding bits */
- continue;
-
- bitmap_ptr[x++] |= bit << plane;
- }
- }
- }
- }
- else if (pcx_depth == 24) /* de-interlace planes */
- {
- byte *src_ptr = row_buffer;
- int plane;
-
- for (plane = 0; plane < pcx->color_planes; plane++)
- {
- int x;
-
- dst_ptr = bitmap_ptr + plane;
- for (x = 0; x < width; x++)
- {
- *dst_ptr = *src_ptr++;
- dst_ptr += pcx->color_planes;
- }
- }
- }
-
- bitmap_ptr += image->bytes_per_row;
- }
-
- free(row_buffer);
-
- return TRUE;
-}
-
-static boolean PCX_ReadColormap(FILE *file,struct PCX_Header *pcx,Image *image)
-{
- int pcx_depth = pcx->bits_per_pixel * pcx->color_planes;
- int num_colors = (1 << pcx_depth);
- int i;
-
- if (image->depth != 8)
- return TRUE;
-
- if (pcx_depth == 8)
- {
- byte value;
- int value_int;
-
- /* look for a 256-colour palette */
- do
- {
- if ((value_int = fgetc(file)) == EOF)
- return FALSE;
- value = (byte)value_int;
- }
- while (value != PCX_256COLORS_MAGIC);
-
- /* read 256 colors from PCX colormap */
- for (i = 0; i < PCX_MAXCOLORS; i++)
- {
- image->rgb.red[i] = (byte)fgetc(file) << 8;
- image->rgb.green[i] = (byte)fgetc(file) << 8;
- image->rgb.blue[i] = (byte)fgetc(file) << 8;
- }
- }
- else
- {
- for (i = 0; i < num_colors; i++)
- {
- image->rgb.red[i] = pcx->palette[i][0] << 8;
- image->rgb.green[i] = pcx->palette[i][1] << 8;
- image->rgb.blue[i] = pcx->palette[i][2] << 8;
- }
- }
-
- return TRUE;
-}
-
-Image *Read_PCX_to_Image(char *filename)
-{
- FILE *file;
- byte header_buffer[PCX_HEADER_SIZE];
- struct PCX_Header pcx;
- Image *image;
- int width, height, depth, pcx_depth;
- int i;
-
- errno_pcx = PCX_Success;
-
- if (!(file = fopen(filename, MODE_READ)))
- {
- errno_pcx = PCX_OpenFailed;
- return NULL;
- }
-
- if (fread(header_buffer, 1, PCX_HEADER_SIZE, file) != PCX_HEADER_SIZE)
- {
- fclose(file);
-
- errno_pcx = PCX_ReadFailed;
- return NULL;
- }
-
- pcx.signature = header_buffer[0];
- pcx.version = header_buffer[1];
- pcx.encoding = header_buffer[2];
- pcx.bits_per_pixel = header_buffer[3];
- pcx.xmin = (header_buffer[5] << 8) | header_buffer[4];
- pcx.ymin = (header_buffer[7] << 8) | header_buffer[6];
- pcx.xmax = (header_buffer[9] << 8) | header_buffer[8];
- pcx.ymax = (header_buffer[11] << 8) | header_buffer[10];
- pcx.color_planes = header_buffer[65];
- pcx.bytes_per_line = (header_buffer[67] << 8) | header_buffer[66];
- pcx.palette_type = (header_buffer[69] << 8) | header_buffer[68];
-
- for (i = 0; i < 48; i++)
- pcx.palette[i / 3][i % 3] = header_buffer[16 + i];
-
- width = pcx.xmax - pcx.xmin + 1;
- height = pcx.ymax - pcx.ymin + 1;
- pcx_depth = pcx.bits_per_pixel * pcx.color_planes;
- depth = ((pcx_depth + 7) / 8) * 8;
-
- if (pcx.signature != PCX_MAGIC ||
- pcx.version != PCX_SUPPORTED_VERSION ||
- pcx.encoding != PCX_ENCODING ||
- width < 0 || height < 0)
- {
- fclose(file);
-
- errno_pcx = PCX_FileInvalid;
- return NULL;
- }
-
-#if PCX_DEBUG
- if (options.verbose)
- {
- printf("\n");
- printf("%s is a %dx%d PC Paintbrush image\n", filename, width, height);
- printf("depth: %d\n", depth);
- printf("bits_per_pixel: %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);
-
- /* read compressed bitmap data */
- if (!PCX_ReadBitmap(file, &pcx, image))
- {
- fclose(file);
- freeImage(image);
-
- errno_pcx = PCX_FileInvalid;
- return NULL;
- }
-
- /* read colormap data */
- if (!PCX_ReadColormap(file, &pcx, image))
- {
- fclose(file);
- freeImage(image);
-
- errno_pcx = PCX_ColorFailed;
- return NULL;
- }
-
- fclose(file);
-
- if (pcx_depth == 8)
- {
- /* determine number of used colormap entries for 8-bit PCX images */
- 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 in colormap\n", image->rgb.used);
-#endif
-
- return image;
-}
-
-#endif /* !TARGET_SDL */
projects / rocksndiamonds.git / blobdiff