--- /dev/null
+/*
+ gd_bmp.c
+
+ Bitmap format support for libgd
+
+ * Written 2007, Scott MacVicar
+ ---------------------------------------------------------------------------
+
+ Todo:
+
+ Bitfield encoding
+
+ ----------------------------------------------------------------------------
+ */
+/* $Id$ */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdio.h>
+#include <math.h>
+#include <string.h>
+#include <stdlib.h>
+#include "gd.h"
+#include "gdhelpers.h"
+#include "bmp.h"
+
+static int compress_row(unsigned char *uncompressed_row, int length);
+static int build_rle_packet(unsigned char *row, int packet_type, int length, unsigned char *data);
+
+static int bmp_read_header(gdIOCtxPtr infile, bmp_hdr_t *hdr);
+static int bmp_read_info(gdIOCtxPtr infile, bmp_info_t *info);
+static int bmp_read_windows_v3_info(gdIOCtxPtr infile, bmp_info_t *info);
+static int bmp_read_os2_v1_info(gdIOCtxPtr infile, bmp_info_t *info);
+static int bmp_read_os2_v2_info(gdIOCtxPtr infile, bmp_info_t *info);
+
+static int bmp_read_direct(gdImagePtr im, gdIOCtxPtr infile, bmp_info_t *info, bmp_hdr_t *header);
+static int bmp_read_1bit(gdImagePtr im, gdIOCtxPtr infile, bmp_info_t *info, bmp_hdr_t *header);
+static int bmp_read_4bit(gdImagePtr im, gdIOCtxPtr infile, bmp_info_t *info, bmp_hdr_t *header);
+static int bmp_read_8bit(gdImagePtr im, gdIOCtxPtr infile, bmp_info_t *info, bmp_hdr_t *header);
+static int bmp_read_rle(gdImagePtr im, gdIOCtxPtr infile, bmp_info_t *info);
+
+#define BMP_DEBUG(s)
+
+static int gdBMPPutWord(gdIOCtx *out, int w)
+{
+ /* Byte order is little-endian */
+ gdPutC(w & 0xFF, out);
+ gdPutC((w >> 8) & 0xFF, out);
+ return 0;
+}
+
+static int gdBMPPutInt(gdIOCtx *out, int w)
+{
+ /* Byte order is little-endian */
+ gdPutC(w & 0xFF, out);
+ gdPutC((w >> 8) & 0xFF, out);
+ gdPutC((w >> 16) & 0xFF, out);
+ gdPutC((w >> 24) & 0xFF, out);
+ return 0;
+}
+
+/*
+ Function: gdImageBmpPtr
+*/
+void * gdImageBmpPtr(gdImagePtr im, int *size, int compression)
+{
+ void *rv;
+ gdIOCtx *out = gdNewDynamicCtx(2048, NULL);
+ if (out == NULL) return NULL;
+ gdImageBmpCtx(im, out, compression);
+ rv = gdDPExtractData(out, size);
+ out->gd_free(out);
+ return rv;
+}
+
+/*
+ Function: gdImageBmp
+*/
+void gdImageBmp(gdImagePtr im, FILE *outFile, int compression)
+{
+ gdIOCtx *out = gdNewFileCtx(outFile);
+ if (out == NULL) return;
+ gdImageBmpCtx(im, out, compression);
+ out->gd_free(out);
+}
+
+/*
+ Function: gdImageBmpCtx
+*/
+void gdImageBmpCtx(gdImagePtr im, gdIOCtxPtr out, int compression)
+{
+ int bitmap_size = 0, info_size, total_size, padding;
+ int i, row, xpos, pixel;
+ int error = 0;
+ unsigned char *uncompressed_row = NULL, *uncompressed_row_start = NULL;
+ FILE *tmpfile_for_compression = NULL;
+ gdIOCtxPtr out_original = NULL;
+
+ /* No compression if its true colour or we don't support seek */
+ if (im->trueColor) {
+ compression = 0;
+ }
+
+ if (compression == 1 && !out->seek) {
+ /* Try to create a temp file where we can seek */
+ if ((tmpfile_for_compression = tmpfile()) == NULL) {
+ compression = 0;
+ } else {
+ out_original = out;
+ if ((out = (gdIOCtxPtr)gdNewFileCtx(tmpfile_for_compression)) == NULL) {
+ out = out_original;
+ out_original = NULL;
+ compression = 0;
+ }
+ }
+ }
+
+ bitmap_size = ((im->sx * (im->trueColor ? 24 : 8)) / 8) * im->sy;
+
+ /* 40 byte Windows v3 header */
+ info_size = BMP_WINDOWS_V3;
+
+ /* data for the palette */
+ if (!im->trueColor) {
+ info_size += im->colorsTotal * 4;
+ if (compression) {
+ bitmap_size = 0;
+ }
+ }
+
+ /* bitmap header + info header + data */
+ total_size = 14 + info_size + bitmap_size;
+
+ /* write bmp header info */
+ gdPutBuf("BM", 2, out);
+ gdBMPPutInt(out, total_size);
+ gdBMPPutWord(out, 0);
+ gdBMPPutWord(out, 0);
+ gdBMPPutInt(out, 14 + info_size);
+
+ /* write Windows v3 headers */
+ gdBMPPutInt(out, BMP_WINDOWS_V3); /* header size */
+ gdBMPPutInt(out, im->sx); /* width */
+ gdBMPPutInt(out, im->sy); /* height */
+ gdBMPPutWord(out, 1); /* colour planes */
+ gdBMPPutWord(out, (im->trueColor ? 24 : 8)); /* bit count */
+ gdBMPPutInt(out, (compression ? BMP_BI_RLE8 : BMP_BI_RGB)); /* compression */
+ gdBMPPutInt(out, bitmap_size); /* image size */
+ gdBMPPutInt(out, 0); /* H resolution */
+ gdBMPPutInt(out, 0); /* V ressolution */
+ gdBMPPutInt(out, im->colorsTotal); /* colours used */
+ gdBMPPutInt(out, 0); /* important colours */
+
+ /* The line must be divisible by 4, else its padded with NULLs */
+ padding = ((int)(im->trueColor ? 3 : 1) * im->sx) % 4;
+ if (padding) {
+ padding = 4 - padding;
+ }
+
+ /* 8-bit colours */
+ if (!im->trueColor) {
+ for(i = 0; i< im->colorsTotal; ++i) {
+ Putchar(gdImageBlue(im, i), out);
+ Putchar(gdImageGreen(im, i), out);
+ Putchar(gdImageRed(im, i), out);
+ Putchar(0, out);
+ }
+
+ if (compression) {
+ /* Can potentially change this to X + ((X / 128) * 3) */
+ uncompressed_row = uncompressed_row_start = (unsigned char *) gdCalloc(gdImageSX(im) * 2, sizeof(char));
+ if (!uncompressed_row) {
+ /* malloc failed */
+ goto cleanup;
+ }
+ }
+
+ for (row = (im->sy - 1); row >= 0; row--) {
+ if (compression) {
+ memset (uncompressed_row, 0, gdImageSX(im));
+ }
+
+ for (xpos = 0; xpos < im->sx; xpos++) {
+ if (compression) {
+ *uncompressed_row++ = (unsigned char)gdImageGetPixel(im, xpos, row);
+ } else {
+ Putchar(gdImageGetPixel(im, xpos, row), out);
+ }
+ }
+
+ if (!compression) {
+ /* Add padding to make sure we have n mod 4 == 0 bytes per row */
+ for (xpos = padding; xpos > 0; --xpos) {
+ Putchar('\0', out);
+ }
+ } else {
+ int compressed_size = 0;
+ uncompressed_row = uncompressed_row_start;
+ if ((compressed_size = compress_row(uncompressed_row, gdImageSX(im))) < 0) {
+ error = 1;
+ break;
+ }
+ bitmap_size += compressed_size;
+
+
+ gdPutBuf(uncompressed_row, compressed_size, out);
+ Putchar(BMP_RLE_COMMAND, out);
+ Putchar(BMP_RLE_ENDOFLINE, out);
+ bitmap_size += 2;
+ }
+ }
+
+ if (compression && uncompressed_row) {
+ gdFree(uncompressed_row);
+ if (error != 0) {
+ goto cleanup;
+ }
+ /* Update filesize based on new values and set compression flag */
+ Putchar(BMP_RLE_COMMAND, out);
+ Putchar(BMP_RLE_ENDOFBITMAP, out);
+ bitmap_size += 2;
+
+ /* Write new total bitmap size */
+ gdSeek(out, 2);
+ gdBMPPutInt(out, total_size + bitmap_size);
+
+ /* Total length of image data */
+ gdSeek(out, 34);
+ gdBMPPutInt(out, bitmap_size);
+ }
+
+ } else {
+ for (row = (im->sy - 1); row >= 0; row--) {
+ for (xpos = 0; xpos < im->sx; xpos++) {
+ pixel = gdImageGetPixel(im, xpos, row);
+
+ Putchar(gdTrueColorGetBlue(pixel), out);
+ Putchar(gdTrueColorGetGreen(pixel), out);
+ Putchar(gdTrueColorGetRed(pixel), out);
+ }
+
+ /* Add padding to make sure we have n mod 4 == 0 bytes per row */
+ for (xpos = padding; xpos > 0; --xpos) {
+ Putchar('\0', out);
+ }
+ }
+ }
+
+
+ /* If we needed a tmpfile for compression copy it over to out_original */
+ if (tmpfile_for_compression) {
+ unsigned char* copy_buffer = NULL;
+ int buffer_size = 0;
+
+ gdSeek(out, 0);
+ copy_buffer = (unsigned char *) gdMalloc(1024 * sizeof(unsigned char));
+ if (copy_buffer == NULL) {
+ goto cleanup;
+ }
+
+ while ((buffer_size = gdGetBuf(copy_buffer, 1024, out)) != EOF) {
+ if (buffer_size == 0) {
+ break;
+ }
+ gdPutBuf(copy_buffer , buffer_size, out_original);
+ }
+ gdFree(copy_buffer);
+
+ /* Replace the temp with the original which now has data */
+ out->gd_free(out);
+ out = out_original;
+ out_original = NULL;
+ }
+
+cleanup:
+ if (tmpfile_for_compression) {
+#ifdef _WIN32
+ _rmtmp();
+#else
+ fclose(tmpfile_for_compression);
+#endif
+ tmpfile_for_compression = NULL;
+ }
+
+ if (out_original) {
+ out_original->gd_free(out_original);
+ }
+ return;
+}
+
+static int compress_row(unsigned char *row, int length)
+{
+ int rle_type = 0;
+ int compressed_length = 0;
+ int pixel = 0, compressed_run = 0, rle_compression = 0;
+ unsigned char *uncompressed_row = NULL, *uncompressed_rowp = NULL, *uncompressed_start = NULL;
+
+ uncompressed_row = (unsigned char *) gdMalloc(length);
+ if (!uncompressed_row) {
+ return -1;
+ }
+
+ memcpy(uncompressed_row, row, length);
+ uncompressed_start = uncompressed_rowp = uncompressed_row;
+
+ for (pixel = 0; pixel < length; pixel++) {
+ if (compressed_run == 0) {
+ uncompressed_row = uncompressed_rowp;
+ compressed_run++;
+ uncompressed_rowp++;
+ rle_type = BMP_RLE_TYPE_RAW;
+ continue;
+ }
+
+ if (compressed_run == 1) {
+ /* Compare next byte */
+ if (memcmp(uncompressed_rowp, uncompressed_rowp - 1, 1) == 0) {
+ rle_type = BMP_RLE_TYPE_RLE;
+ }
+ }
+
+ if (rle_type == BMP_RLE_TYPE_RLE) {
+ if (compressed_run >= 128 || memcmp(uncompressed_rowp, uncompressed_rowp - 1, 1) != 0) {
+ /* more than what we can store in a single run or run is over due to non match, force write */
+ rle_compression = build_rle_packet(row, rle_type, compressed_run, uncompressed_row);
+ row += rle_compression;
+ compressed_length += rle_compression;
+ compressed_run = 0;
+ pixel--;
+ } else {
+ compressed_run++;
+ uncompressed_rowp++;
+ }
+ } else {
+ if (compressed_run >= 128 || memcmp(uncompressed_rowp, uncompressed_rowp - 1, 1) == 0) {
+ /* more than what we can store in a single run or run is over due to match, force write */
+ rle_compression = build_rle_packet(row, rle_type, compressed_run, uncompressed_row);
+ row += rle_compression;
+ compressed_length += rle_compression;
+ compressed_run = 0;
+ pixel--;
+ } else {
+ /* add this pixel to the row */
+ compressed_run++;
+ uncompressed_rowp++;
+ }
+
+ }
+ }
+
+ if (compressed_run) {
+ if (rle_type == BMP_RLE_TYPE_RLE) {
+ compressed_length += build_rle_packet(row, rle_type, compressed_run, uncompressed_row);
+ }
+ }
+
+ gdFree(uncompressed_start);
+
+ return compressed_length;
+}
+
+static int build_rle_packet(unsigned char *row, int packet_type, int length, unsigned char *data)
+{
+ int compressed_size = 0;
+ if (length < 1 || length > 128) {
+ return 0;
+ }
+
+ /* Bitmap specific cases is that we can't have uncompressed rows of length 1 or 2 */
+ if (packet_type == BMP_RLE_TYPE_RAW && length < 3) {
+ int i = 0;
+ for (i = 0; i < length; i++) {
+ compressed_size += 2;
+ memset(row, 1, 1);
+ row++;
+
+ memcpy(row, data++, 1);
+ row++;
+ }
+ } else if (packet_type == BMP_RLE_TYPE_RLE) {
+ compressed_size = 2;
+ memset(row, length, 1);
+ row++;
+
+ memcpy(row, data, 1);
+ row++;
+ } else {
+ compressed_size = 2 + length;
+ memset(row, BMP_RLE_COMMAND, 1);
+ row++;
+
+ memset(row, length, 1);
+ row++;
+
+ memcpy(row, data, length);
+ row += length;
+
+ /* Must be an even number for an uncompressed run */
+ if (length % 2) {
+ memset(row, 0, 1);
+ row++;
+ compressed_size++;
+ }
+ }
+ return compressed_size;
+}
+
+/*
+ Function: gdImageCreateFromBmp
+*/
+gdImagePtr gdImageCreateFromBmp(FILE * inFile)
+{
+ gdImagePtr im = 0;
+ gdIOCtx *in = gdNewFileCtx(inFile);
+ if (in == NULL) return NULL;
+ im = gdImageCreateFromBmpCtx(in);
+ in->gd_free(in);
+ return im;
+}
+
+/*
+ Function: gdImageCreateFromBmpPtr
+*/
+gdImagePtr gdImageCreateFromBmpPtr(int size, void *data)
+{
+ gdImagePtr im;
+ gdIOCtx *in = gdNewDynamicCtxEx(size, data, 0);
+ if (in == NULL) return NULL;
+ im = gdImageCreateFromBmpCtx(in);
+ in->gd_free(in);
+ return im;
+}
+
+/*
+ Function: gdImageCreateFromBmpCtx
+*/
+gdImagePtr gdImageCreateFromBmpCtx(gdIOCtxPtr infile)
+{
+ bmp_hdr_t *hdr;
+ bmp_info_t *info;
+ gdImagePtr im = NULL;
+ int error = 0;
+
+ if (!(hdr= (bmp_hdr_t *)gdCalloc(1, sizeof(bmp_hdr_t)))) {
+ return NULL;
+ }
+
+ if (bmp_read_header(infile, hdr)) {
+ gdFree(hdr);
+ return NULL;
+ }
+
+ if (hdr->magic != 0x4d42) {
+ gdFree(hdr);
+ return NULL;
+ }
+
+ if (!(info = (bmp_info_t *)gdCalloc(1, sizeof(bmp_info_t)))) {
+ gdFree(hdr);
+ return NULL;
+ }
+
+ if (bmp_read_info(infile, info)) {
+ gdFree(hdr);
+ gdFree(info);
+ return NULL;
+ }
+
+ BMP_DEBUG(printf("Numcolours: %d\n", info->numcolors));
+ BMP_DEBUG(printf("Width: %d\n", info->width));
+ BMP_DEBUG(printf("Height: %d\n", info->height));
+ BMP_DEBUG(printf("Planes: %d\n", info->numplanes));
+ BMP_DEBUG(printf("Depth: %d\n", info->depth));
+ BMP_DEBUG(printf("Offset: %d\n", hdr->off));
+
+ if (info->depth >= 16) {
+ im = gdImageCreateTrueColor(info->width, info->height);
+ } else {
+ im = gdImageCreate(info->width, info->height);
+ }
+
+ if (!im) {
+ gdFree(hdr);
+ gdFree(info);
+ return NULL;
+ }
+
+ switch (info->depth) {
+ case 1:
+ BMP_DEBUG(printf("1-bit image\n"));
+ error = bmp_read_1bit(im, infile, info, hdr);
+ break;
+ case 4:
+ BMP_DEBUG(printf("4-bit image\n"));
+ error = bmp_read_4bit(im, infile, info, hdr);
+ break;
+ case 8:
+ BMP_DEBUG(printf("8-bit image\n"));
+ error = bmp_read_8bit(im, infile, info, hdr);
+ break;
+ case 16:
+ case 24:
+ case 32:
+ BMP_DEBUG(printf("Direct BMP image\n"));
+ error = bmp_read_direct(im, infile, info, hdr);
+ break;
+ default:
+ BMP_DEBUG(printf("Unknown bit count\n"));
+ error = 1;
+ }
+
+ gdFree(hdr);
+ gdFree(info);
+
+ if (error) {
+ gdImageDestroy(im);
+ return NULL;
+ }
+
+ return im;
+}
+
+static int bmp_read_header(gdIOCtx *infile, bmp_hdr_t *hdr)
+{
+ if(
+ !gdGetWordLSB(&hdr->magic, infile) ||
+ !gdGetIntLSB(&hdr->size, infile) ||
+ !gdGetWordLSB(&hdr->reserved1, infile) ||
+ !gdGetWordLSB(&hdr->reserved2 , infile) ||
+ !gdGetIntLSB(&hdr->off , infile)
+ ) {
+ return 1;
+ }
+ return 0;
+}
+
+static int bmp_read_info(gdIOCtx *infile, bmp_info_t *info)
+{
+ /* read BMP length so we can work out the version */
+ if (!gdGetIntLSB(&info->len, infile)) {
+ return 1;
+ }
+
+ switch (info->len) {
+ /* For now treat Windows v4 + v5 as v3 */
+ case BMP_WINDOWS_V3:
+ case BMP_WINDOWS_V4:
+ case BMP_WINDOWS_V5:
+ BMP_DEBUG(printf("Reading Windows Header\n"));
+ if (bmp_read_windows_v3_info(infile, info)) {
+ return 1;
+ }
+ break;
+ case BMP_OS2_V1:
+ if (bmp_read_os2_v1_info(infile, info)) {
+ return 1;
+ }
+ break;
+ case BMP_OS2_V2:
+ if (bmp_read_os2_v2_info(infile, info)) {
+ return 1;
+ }
+ break;
+ default:
+ BMP_DEBUG(printf("Unhandled bitmap\n"));
+ return 1;
+ }
+ return 0;
+}
+
+static int bmp_read_windows_v3_info(gdIOCtxPtr infile, bmp_info_t *info)
+{
+ if (
+ !gdGetIntLSB(&info->width, infile) ||
+ !gdGetIntLSB(&info->height, infile) ||
+ !gdGetWordLSB(&info->numplanes, infile) ||
+ !gdGetWordLSB(&info->depth, infile) ||
+ !gdGetIntLSB(&info->enctype, infile) ||
+ !gdGetIntLSB(&info->size, infile) ||
+ !gdGetIntLSB(&info->hres, infile) ||
+ !gdGetIntLSB(&info->vres, infile) ||
+ !gdGetIntLSB(&info->numcolors, infile) ||
+ !gdGetIntLSB(&info->mincolors, infile)
+ ) {
+ return 1;
+ }
+
+ if (info->height < 0) {
+ info->topdown = 1;
+ info->height = -info->height;
+ } else {
+ info->topdown = 0;
+ }
+
+ info->type = BMP_PALETTE_4;
+
+ if (info->width <= 0 || info->height <= 0 || info->numplanes <= 0 ||
+ info->depth <= 0 || info->numcolors < 0 || info->mincolors < 0) {
+ return 1;
+ }
+
+ return 0;
+}
+
+static int bmp_read_os2_v1_info(gdIOCtxPtr infile, bmp_info_t *info)
+{
+ if (
+ !gdGetWordLSB((signed short int *)&info->width, infile) ||
+ !gdGetWordLSB((signed short int *)&info->height, infile) ||
+ !gdGetWordLSB(&info->numplanes, infile) ||
+ !gdGetWordLSB(&info->depth, infile)
+ ) {
+ return 1;
+ }
+
+ /* OS2 v1 doesn't support topdown */
+ info->topdown = 0;
+
+ info->numcolors = 1 << info->depth;
+ info->type = BMP_PALETTE_3;
+
+ if (info->width <= 0 || info->height <= 0 || info->numplanes <= 0 ||
+ info->depth <= 0 || info->numcolors < 0) {
+ return 1;
+ }
+
+ return 0;
+}
+
+static int bmp_read_os2_v2_info(gdIOCtxPtr infile, bmp_info_t *info)
+{
+ char useless_bytes[24];
+ if (
+ !gdGetIntLSB(&info->width, infile) ||
+ !gdGetIntLSB(&info->height, infile) ||
+ !gdGetWordLSB(&info->numplanes, infile) ||
+ !gdGetWordLSB(&info->depth, infile) ||
+ !gdGetIntLSB(&info->enctype, infile) ||
+ !gdGetIntLSB(&info->size, infile) ||
+ !gdGetIntLSB(&info->hres, infile) ||
+ !gdGetIntLSB(&info->vres, infile) ||
+ !gdGetIntLSB(&info->numcolors, infile) ||
+ !gdGetIntLSB(&info->mincolors, infile)
+ ) {
+ return 1;
+ }
+
+ /* Lets seek the next 24 pointless bytes, we don't care too much about it */
+ if (!gdGetBuf(useless_bytes, 24, infile)) {
+ return 1;
+ }
+
+ if (info->height < 0) {
+ info->topdown = 1;
+ info->height = -info->height;
+ } else {
+ info->topdown = 0;
+ }
+
+ info->type = BMP_PALETTE_4;
+
+ if (info->width <= 0 || info->height <= 0 || info->numplanes <= 0 ||
+ info->depth <= 0 || info->numcolors < 0 || info->mincolors < 0) {
+ return 1;
+ }
+
+
+ return 0;
+}
+
+static int bmp_read_direct(gdImagePtr im, gdIOCtxPtr infile, bmp_info_t *info, bmp_hdr_t *header)
+{
+ int ypos = 0, xpos = 0, row = 0;
+ int padding = 0, alpha = 0, red = 0, green = 0, blue = 0;
+ signed short int data = 0;
+
+ switch(info->enctype) {
+ case BMP_BI_RGB:
+ /* no-op */
+ break;
+
+ case BMP_BI_BITFIELDS:
+ if (info->depth == 24) {
+ BMP_DEBUG(printf("Bitfield compression isn't supported for 24-bit\n"));
+ return 1;
+ }
+ BMP_DEBUG(printf("Currently no bitfield support\n"));
+ return 1;
+ break;
+
+ case BMP_BI_RLE8:
+ if (info->depth != 8) {
+ BMP_DEBUG(printf("RLE is only valid for 8-bit images\n"));
+ return 1;
+ }
+ break;
+ case BMP_BI_RLE4:
+ if (info->depth != 4) {
+ BMP_DEBUG(printf("RLE is only valid for 4-bit images\n"));
+ return 1;
+ }
+ break;
+ case BMP_BI_JPEG:
+ case BMP_BI_PNG:
+ default:
+ BMP_DEBUG(printf("Unsupported BMP compression format\n"));
+ return 1;
+ }
+
+ /* There is a chance the data isn't until later, would be wierd but it is possible */
+ if (gdTell(infile) != header->off) {
+ /* Should make sure we don't seek past the file size */
+ gdSeek(infile, header->off);
+ }
+
+ /* The line must be divisible by 4, else its padded with NULLs */
+ padding = ((int)(info->depth / 8) * info->width) % 4;
+ if (padding) {
+ padding = 4 - padding;
+ }
+
+
+ for (ypos = 0; ypos < info->height; ++ypos) {
+ if (info->topdown) {
+ row = ypos;
+ } else {
+ row = info->height - ypos - 1;
+ }
+
+ for (xpos = 0; xpos < info->width; xpos++) {
+ if (info->depth == 16) {
+ if (!gdGetWordLSB(&data, infile)) {
+ return 1;
+ }
+ BMP_DEBUG(printf("Data: %X\n", data));
+ red = ((data & 0x7C00) >> 10) << 3;
+ green = ((data & 0x3E0) >> 5) << 3;
+ blue = (data & 0x1F) << 3;
+ BMP_DEBUG(printf("R: %d, G: %d, B: %d\n", red, green, blue));
+ } else if (info->depth == 24) {
+ if (!gdGetByte(&blue, infile) || !gdGetByte(&green, infile) || !gdGetByte(&red, infile)) {
+ return 1;
+ }
+ } else {
+ if (!gdGetByte(&blue, infile) || !gdGetByte(&green, infile) || !gdGetByte(&red, infile) || !gdGetByte(&alpha, infile)) {
+ return 1;
+ }
+ }
+ /*alpha = gdAlphaMax - (alpha >> 1);*/
+ gdImageSetPixel(im, xpos, row, gdTrueColor(red, green, blue));
+ }
+ for (xpos = padding; xpos > 0; --xpos) {
+ if (!gdGetByte(&red, infile)) {
+ return 1;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static int bmp_read_palette(gdImagePtr im, gdIOCtxPtr infile, int count, int read_four)
+{
+ int i;
+ int r, g, b, z;
+
+ for (i = 0; i < count; i++) {
+ if (
+ !gdGetByte(&b, infile) ||
+ !gdGetByte(&g, infile) ||
+ !gdGetByte(&r, infile) ||
+ (read_four && !gdGetByte(&z, infile))
+ ) {
+ return 1;
+ }
+ im->red[i] = r;
+ im->green[i] = g;
+ im->blue[i] = b;
+ im->open[i] = 1;
+ }
+ return 0;
+}
+
+static int bmp_read_1bit(gdImagePtr im, gdIOCtxPtr infile, bmp_info_t *info, bmp_hdr_t *header)
+{
+ int ypos = 0, xpos = 0, row = 0, index = 0;
+ int padding = 0, current_byte = 0, bit = 0;
+
+ if (info->enctype != BMP_BI_RGB) {
+ return 1;
+ }
+
+ if (!info->numcolors) {
+ info->numcolors = 2;
+ } else if (info->numcolors < 0 || info->numcolors > 2) {
+ return 1;
+ }
+
+ if (bmp_read_palette(im, infile, info->numcolors, (info->type == BMP_PALETTE_4))) {
+ return 1;
+ }
+
+ im->colorsTotal = info->numcolors;
+
+ /* There is a chance the data isn't until later, would be wierd but it is possible */
+ if (gdTell(infile) != header->off) {
+ /* Should make sure we don't seek past the file size */
+ gdSeek(infile, header->off);
+ }
+
+ /* The line must be divisible by 4, else its padded with NULLs */
+ padding = ((int)ceil(0.1 * info->width)) % 4;
+ if (padding) {
+ padding = 4 - padding;
+ }
+
+ for (ypos = 0; ypos < info->height; ++ypos) {
+ if (info->topdown) {
+ row = ypos;
+ } else {
+ row = info->height - ypos - 1;
+ }
+
+ for (xpos = 0; xpos < info->width; xpos += 8) {
+ /* Bitmaps are always aligned in bytes so we'll never overflow */
+ if (!gdGetByte(¤t_byte, infile)) {
+ return 1;
+ }
+
+ for (bit = 0; bit < 8; bit++) {
+ index = ((current_byte & (0x80 >> bit)) != 0 ? 0x01 : 0x00);
+ if (im->open[index]) {
+ im->open[index] = 0;
+ }
+ gdImageSetPixel(im, xpos + bit, row, index);
+ /* No need to read anything extra */
+ if ((xpos + bit) >= info->width) {
+ break;
+ }
+ }
+ }
+
+ for (xpos = padding; xpos > 0; --xpos) {
+ if (!gdGetByte(&index, infile)) {
+ return 1;
+ }
+ }
+ }
+ return 0;
+}
+
+static int bmp_read_4bit(gdImagePtr im, gdIOCtxPtr infile, bmp_info_t *info, bmp_hdr_t *header)
+{
+ int ypos = 0, xpos = 0, row = 0, index = 0;
+ int padding = 0, current_byte = 0;
+
+ if (info->enctype != BMP_BI_RGB && info->enctype != BMP_BI_RLE4) {
+ return 1;
+ }
+
+ if (!info->numcolors) {
+ info->numcolors = 16;
+ } else if (info->numcolors < 0 || info->numcolors > 16) {
+ return 1;
+ }
+
+ if (bmp_read_palette(im, infile, info->numcolors, (info->type == BMP_PALETTE_4))) {
+ return 1;
+ }
+
+ im->colorsTotal = info->numcolors;
+
+ /* There is a chance the data isn't until later, would be wierd but it is possible */
+ if (gdTell(infile) != header->off) {
+ /* Should make sure we don't seek past the file size */
+ gdSeek(infile, header->off);
+ }
+
+ /* The line must be divisible by 4, else its padded with NULLs */
+ padding = ((int)ceil(0.5 * info->width)) % 4;
+ if (padding) {
+ padding = 4 - padding;
+ }
+
+ switch (info->enctype) {
+ case BMP_BI_RGB:
+ for (ypos = 0; ypos < info->height; ++ypos) {
+ if (info->topdown) {
+ row = ypos;
+ } else {
+ row = info->height - ypos - 1;
+ }
+
+ for (xpos = 0; xpos < info->width; xpos += 2) {
+ if (!gdGetByte(¤t_byte, infile)) {
+ return 1;
+ }
+
+ index = (current_byte >> 4) & 0x0f;
+ if (im->open[index]) {
+ im->open[index] = 0;
+ }
+ gdImageSetPixel(im, xpos, row, index);
+
+ /* This condition may get called often, potential optimsations */
+ if (xpos >= info->width) {
+ break;
+ }
+
+ index = current_byte & 0x0f;
+ if (im->open[index]) {
+ im->open[index] = 0;
+ }
+ gdImageSetPixel(im, xpos + 1, row, index);
+ }
+
+ for (xpos = padding; xpos > 0; --xpos) {
+ if (!gdGetByte(&index, infile)) {
+ return 1;
+ }
+ }
+ }
+ break;
+
+ case BMP_BI_RLE4:
+ if (bmp_read_rle(im, infile, info)) {
+ return 1;
+ }
+ break;
+
+ default:
+ return 1;
+ }
+ return 0;
+}
+
+static int bmp_read_8bit(gdImagePtr im, gdIOCtxPtr infile, bmp_info_t *info, bmp_hdr_t *header)
+{
+ int ypos = 0, xpos = 0, row = 0, index = 0;
+ int padding = 0;
+
+ if (info->enctype != BMP_BI_RGB && info->enctype != BMP_BI_RLE8) {
+ return 1;
+ }
+
+ if (!info->numcolors) {
+ info->numcolors = 256;
+ } else if (info->numcolors < 0 || info->numcolors > 256) {
+ return 1;
+ }
+
+ if (bmp_read_palette(im, infile, info->numcolors, (info->type == BMP_PALETTE_4))) {
+ return 1;
+ }
+
+ im->colorsTotal = info->numcolors;
+
+ /* There is a chance the data isn't until later, would be wierd but it is possible */
+ if (gdTell(infile) != header->off) {
+ /* Should make sure we don't seek past the file size */
+ gdSeek(infile, header->off);
+ }
+
+ /* The line must be divisible by 4, else its padded with NULLs */
+ padding = (1 * info->width) % 4;
+ if (padding) {
+ padding = 4 - padding;
+ }
+
+ switch (info->enctype) {
+ case BMP_BI_RGB:
+ for (ypos = 0; ypos < info->height; ++ypos) {
+ if (info->topdown) {
+ row = ypos;
+ } else {
+ row = info->height - ypos - 1;
+ }
+
+ for (xpos = 0; xpos < info->width; ++xpos) {
+ if (!gdGetByte(&index, infile)) {
+ return 1;
+ }
+
+ if (im->open[index]) {
+ im->open[index] = 0;
+ }
+ gdImageSetPixel(im, xpos, row, index);
+ }
+ /* Could create a new variable, but it isn't really worth it */
+ for (xpos = padding; xpos > 0; --xpos) {
+ if (!gdGetByte(&index, infile)) {
+ return 1;
+ }
+ }
+ }
+ break;
+
+ case BMP_BI_RLE8:
+ if (bmp_read_rle(im, infile, info)) {
+ return 1;
+ }
+ break;
+
+ default:
+ return 1;
+ }
+ return 0;
+}
+
+static int bmp_read_rle(gdImagePtr im, gdIOCtxPtr infile, bmp_info_t *info)
+{
+ int ypos = 0, xpos = 0, row = 0, index = 0;
+ int rle_length = 0, rle_data = 0;
+ int padding = 0;
+ int i = 0, j = 0;
+ int pixels_per_byte = 8 / info->depth;
+
+ for (ypos = 0; ypos < info->height && xpos <= info->width;) {
+ if (!gdGetByte(&rle_length, infile) || !gdGetByte(&rle_data, infile)) {
+ return 1;
+ }
+ row = info->height - ypos - 1;
+
+ if (rle_length != BMP_RLE_COMMAND) {
+ if (im->open[rle_data]) {
+ im->open[rle_data] = 0;
+ }
+
+ for (i = 0; (i < rle_length) && (xpos < info->width);) {
+ for (j = 1; (j <= pixels_per_byte) && (xpos < info->width) && (i < rle_length); j++, xpos++, i++) {
+ index = (rle_data & (((1 << info->depth) - 1) << (8 - (j * info->depth)))) >> (8 - (j * info->depth));
+ if (im->open[index]) {
+ im->open[index] = 0;
+ }
+ gdImageSetPixel(im, xpos, row, index);
+ }
+ }
+ } else if (rle_length == BMP_RLE_COMMAND && rle_data > 2) {
+ /* Uncompressed RLE needs to be even */
+ padding = 0;
+ for (i = 0; (i < rle_data) && (xpos < info->width); i += pixels_per_byte) {
+ int max_pixels = pixels_per_byte;
+
+ if (!gdGetByte(&index, infile)) {
+ return 1;
+ }
+ padding++;
+
+ if (rle_data - i < max_pixels) {
+ max_pixels = rle_data - i;
+ }
+
+ for (j = 1; (j <= max_pixels) && (xpos < info->width); j++, xpos++) {
+ int temp = (index >> (8 - (j * info->depth))) & ((1 << info->depth) - 1);
+ if (im->open[temp]) {
+ im->open[temp] = 0;
+ }
+ gdImageSetPixel(im, xpos, row, temp);
+ }
+ }
+
+ /* Make sure the bytes read are even */
+ if (padding % 2 && !gdGetByte(&index, infile)) {
+ return 1;
+ }
+ } else if (rle_length == BMP_RLE_COMMAND && rle_data == BMP_RLE_ENDOFLINE) {
+ /* Next Line */
+ xpos = 0;
+ ypos++;
+ } else if (rle_length == BMP_RLE_COMMAND && rle_data == BMP_RLE_DELTA) {
+ /* Delta Record, used for bmp files that contain other data*/
+ if (!gdGetByte(&rle_length, infile) || !gdGetByte(&rle_data, infile)) {
+ return 1;
+ }
+ xpos += rle_length;
+ ypos += rle_data;
+ } else if (rle_length == BMP_RLE_COMMAND && rle_data == BMP_RLE_ENDOFBITMAP) {
+ /* End of bitmap */
+ break;
+ }
+ }
+ return 0;
+}
projects / php / commitdiff
