gd_gd.c

Go to the documentation of this file.

#include <stdio.h>
#include <math.h>
#include <string.h>
#include <stdlib.h>
#include "gd.h"
 
#define TRUE 1
#define FALSE 0
 
/* Exported functions: */
extern void gdImageGd (gdImagePtr im, FILE * out);
 
 
/* Use this for commenting out debug-print statements. */
/* Just use the first '#define' to allow all the prints... */
/*#define GD2_DBG(s) (s) */
#define GD2_DBG(s)
 
/* */
/* Shared code to read color tables from gd file. */
/* */
int _gdGetColors (gdIOCtx * in, gdImagePtr im, int gd2xFlag)
{
    int i;
    if (gd2xFlag) {
        int trueColorFlag;
        if (!gdGetByte(&trueColorFlag, in)) {
            goto fail1;
        }
        /* 2.0.12: detect bad truecolor .gd files created by pre-2.0.12.
         * Beginning in 2.0.12 truecolor is indicated by the initial 2-byte
         * signature.
         */
        if (trueColorFlag != im->trueColor) {
            goto fail1;
        }
        /* This should have been a word all along */
        if (!im->trueColor) {
            if (!gdGetWord(&im->colorsTotal, in)) {
                goto fail1;
            }
            if (im->colorsTotal > gdMaxColors) {
                goto fail1;
            }
        }
        /* Int to accommodate truecolor single-color transparency */
        if (!gdGetInt(&im->transparent, in)) {
            goto fail1;
        }
    } else {
        if (!gdGetByte(&im->colorsTotal, in)) {
            goto fail1;
        }
        if (!gdGetWord(&im->transparent, in)) {
            goto fail1;
        }
        if (im->transparent == 257) {
            im->transparent = (-1);
        }
    }
 
    GD2_DBG(printf("Palette had %d colours (T=%d)\n", im->colorsTotal, im->transparent));
 
    if (im->trueColor) {
        return TRUE;
    }
 
    for (i = 0; i < gdMaxColors; i++) {
        if (!gdGetByte(&im->red[i], in)) {
            goto fail1;
        }
        if (!gdGetByte(&im->green[i], in)) {
            goto fail1;
        }
        if (!gdGetByte(&im->blue[i], in)) {
            goto fail1;
        }
        if (gd2xFlag) {
            if (!gdGetByte(&im->alpha[i], in)) {
                goto fail1;
            }
        }
    }
 
    for (i = 0; i < im->colorsTotal; i++) {
        im->open[i] = 0;
    }
 
    return TRUE;
fail1:
    return FALSE;
}
 
/* */
/* Use the common basic header info to make the image object. */
/* */
static gdImagePtr _gdCreateFromFile (gdIOCtx * in, int *sx, int *sy)
{
    gdImagePtr im;
    int gd2xFlag = 0;
    int trueColorFlag = 0;
 
    if (!gdGetWord(sx, in)) {
        goto fail1;
    }
    if (*sx == 65535 || *sx == 65534) {
        /* This is a gd 2.0 .gd file */
        gd2xFlag = 1;
        /* 2.0.12: 65534 signals a truecolor .gd file. There is a slight redundancy here but we can live with it. */
        if (*sx == 65534) {
            trueColorFlag = 1;
        }
        if (!gdGetWord(sx, in)) {
            goto fail1;
        }
    }
    if (!gdGetWord(sy, in)) {
        goto fail1;
    }
 
    GD2_DBG(printf("Image is %dx%d\n", *sx, *sy));
 
    if (trueColorFlag) {
        im = gdImageCreateTrueColor(*sx, *sy);
    } else {
        im = gdImageCreate(*sx, *sy);
    }
    if(!im) {
        goto fail1;
    }
    if (!_gdGetColors(in, im, gd2xFlag)) {
        goto fail2;
    }
 
    return im;
fail2:
    gdImageDestroy(im);
fail1:
    return 0;
}
 
gdImagePtr gdImageCreateFromGd (FILE * inFile)
{
    gdImagePtr im;
    gdIOCtx *in;
 
    in = gdNewFileCtx(inFile);
    im = gdImageCreateFromGdCtx(in);
 
    in->gd_free(in);
 
    return im;
}
 
gdImagePtr gdImageCreateFromGdPtr (int size, void *data)
{
    gdImagePtr im;
    gdIOCtx *in = gdNewDynamicCtxEx(size, data, 0);
    im = gdImageCreateFromGdCtx(in);
    in->gd_free(in);
 
    return im;
}
 
gdImagePtr gdImageCreateFromGdCtx (gdIOCtxPtr in)
{
    int sx, sy;
    int x, y;
    gdImagePtr im;
 
    /* Read the header */
    im = _gdCreateFromFile(in, &sx, &sy);
 
    if (im == NULL) {
        goto fail1;
    }
 
    /* Then the data... */
    /* 2.0.12: support truecolor properly in .gd as well as in .gd2. Problem reported by Andreas Pfaller. */
    if (im->trueColor) {
        for (y = 0; y < sy; y++) {
            for (x = 0; x < sx; x++) {
                int pix;
                if (!gdGetInt(&pix, in)) {
                    goto fail2;
                }
                im->tpixels[y][x] = pix;
            }
        }
    } else {
        for (y = 0; y < sy; y++) {
            for (x = 0; x < sx; x++) {
                int ch;
                ch = gdGetC(in);
                if (ch == EOF) {
                    goto fail2;
                }
                /* ROW-MAJOR IN GD 1.3 */
                im->pixels[y][x] = ch;
            }
        }
    }
 
    return im;
 
fail2:
    gdImageDestroy (im);
fail1:
    return 0;
}
 
void _gdPutColors (gdImagePtr im, gdIOCtx * out)
{
    int i;
 
    gdPutC(im->trueColor, out);
    if (!im->trueColor) {
        gdPutWord(im->colorsTotal, out);
    }
    gdPutInt(im->transparent, out);
    if (!im->trueColor) {
        for (i = 0; i < gdMaxColors; i++) {
            gdPutC((unsigned char) im->red[i], out);
            gdPutC((unsigned char) im->green[i], out);
            gdPutC((unsigned char) im->blue[i], out);
            gdPutC((unsigned char) im->alpha[i], out);
        }
    }
}
 
static void _gdPutHeader (gdImagePtr im, gdIOCtx * out)
{
    /* 65535 indicates this is a gd 2.x .gd file.
     * 2.0.12: 65534 indicates truecolor.
     */
    if (im->trueColor) {
        gdPutWord(65534, out);
    } else {
        gdPutWord(65535, out);
    }
    gdPutWord(im->sx, out);
    gdPutWord(im->sy, out);
 
    _gdPutColors(im, out);
}
 
static void _gdImageGd (gdImagePtr im, gdIOCtx * out)
{
    int x, y;
 
    _gdPutHeader(im, out);
 
    for (y = 0; y < im->sy; y++) {
        for (x = 0; x < im->sx; x++) {
            /* ROW-MAJOR IN GD 1.3 */
            if (im->trueColor) {
                gdPutInt(im->tpixels[y][x], out);
            } else {
                gdPutC((unsigned char) im->pixels[y][x], out);
            }
        }
    }
}
 
void gdImageGd (gdImagePtr im, FILE * outFile)
{
    gdIOCtx *out = gdNewFileCtx(outFile);
    _gdImageGd(im, out);
    out->gd_free(out);
}
 
void *gdImageGdPtr (gdImagePtr im, int *size)
{
    void *rv;
    gdIOCtx *out = gdNewDynamicCtx(2048, NULL);
    _gdImageGd(im, out);
    rv = gdDPExtractData(out, size);
    out->gd_free(out);
    return rv;
}