psdriver/raster.c

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#include <string.h>
 
#include "psdriver.h"
 
static int masked;
 
void PS_begin_raster(int mask, int src[2][2], double dst[2][2])
{
    const char *type = ps.true_color ? (mask ? "RASTERRGBMASK" : "RASTERRGB")
                                     : (mask ? "RASTERGRAYMASK" : "RASTERGRAY");
 
    int ssx = src[0][1] - src[0][0];
    int ssy = src[1][1] - src[1][0];
    int sox = src[0][0];
    int soy = src[1][0];
 
    double dsx = dst[0][1] - dst[0][0];
    double dsy = dst[1][1] - dst[1][0];
    double dox = dst[0][0];
    double doy = dst[1][0];
 
    masked = mask;
 
    output("gsave\n");
    output("%f %f translate %f %f scale\n", dox, doy, dsx, dsy);
    output("%d %d [%d 0 0 %d %d %d] %s\n", ssx, ssy, ssx, ssy, sox, soy, type);
}
 
int PS_raster(int n, int row, const unsigned char *red,
              const unsigned char *grn, const unsigned char *blu,
              const unsigned char *nul)
{
    int i;
 
    for (i = 0; i < n; i++) {
        if (ps.true_color) {
            if (masked)
                output("%02X%02X%02X%02X", (nul && nul[i]) ? 0xFF : 0x00,
                       red[i], grn[i], blu[i]);
            else
                output("%02X%02X%02X", red[i], grn[i], blu[i]);
        }
        else {
            unsigned int gray = (unsigned int)(red[i] * 0.299 + grn[i] * 0.587 +
                                               blu[i] * 0.114);
 
            if (masked)
                output("%02X%02X", (nul && nul[i]) ? 0xFF : 0x00, gray);
            else
                output("%02X", gray);
        }
    }
 
    output("\n");
 
    return row + 1;
}
 
void PS_end_raster(void)
{
    output("grestore\n");
}