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/*
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* abitmapio.cpp
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* panlib
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*
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* BitMap class file i/o using BMP format.
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*
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* Created by Greg Ward on 6/30/16.
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* Copyright 2016 Anyhere Software. All rights reserved.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "abitmap.h"
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#include "bmpfile.h"
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#include "dmessage.h"
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static const char BitMap1Dmagic[] = "1-D BitMap";
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static const char BitMap2Dmagic[] = "2-D BitMap";
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// Function to write a bitmap to a BMP file
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bool
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WriteBitMap(const ABitMap &bm, const char *fname)
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{
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if (!bm.Length() || fname == NULL || !*fname)
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return false;
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if (bm.Length() >= 1L<<31) {
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DMESG(DMCparameter, "BitMap too long to write as one scanline");
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return false;
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}
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BMPHeader * hdr = BMPmappedHeader(bm.Length(), 1, 16, 2);
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if (hdr == NULL) {
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DMESG(DMCparameter, "Cannot create BMP header");
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return false;
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}
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strncpy(BMPinfo(hdr), BitMap1Dmagic, 16);
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BMPWriter * wtr = BMPopenOutputFile(fname, hdr);
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if (wtr == NULL) {
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DMESGF(DMCresource, "Cannot open BMP output file '%s'", fname);
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free(hdr);
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return false;
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}
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DMESGF(DMCtrace, "Writing 1-D bitmap to '%s'", fname);
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memset(wtr->scanline, 0, (bm.Length()+7)>>3);
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for (uint32 i = 0; bm.Find(&i); i++)
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wtr->scanline[i>>3] |= 128>>(i&7);
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int rval = BMPwriteScanline(wtr);
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BMPcloseOutput(wtr);
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if (rval != BIR_OK) {
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DMESG(DMCdata, BMPerrorMessage(rval));
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return false;
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}
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return true;
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}
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// Function to write a 2-D bitmap to a BMP file
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bool
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WriteBitMap2(const ABitMap2 &bm2, const char *fname)
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{
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if (!bm2.Width() | !bm2.Height() || fname == NULL || !*fname)
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return false;
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BMPHeader * hdr = BMPmappedHeader(bm2.Width(), bm2.Height(), 16, 2);
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if (hdr == NULL) {
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DMESG(DMCparameter, "Cannot create BMP header");
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return false;
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}
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strncpy(BMPinfo(hdr), BitMap2Dmagic, 16);
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hdr->yIsDown = 1; // sane scanline ordering
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BMPWriter * wtr = BMPopenOutputFile(fname, hdr);
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if (wtr == NULL) {
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DMESGF(DMCresource, "Cannot open BMP output file '%s'", fname);
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free(hdr);
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return false;
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}
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DMESGF(DMCtrace, "Writing 2-D bitmap to '%s'", fname);
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int rval = BIR_OK;
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int my = 0;
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for (int y = 0; y < bm2.Height(); y++) {
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memset(wtr->scanline, 0, (bm2.Width()+7)>>3);
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while (y < my) { // write empty scanlines
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if ((rval = BMPwriteScanline(wtr)) != BIR_OK)
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break;
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++y;
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}
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if ((rval != BIR_OK) | (y >= bm2.Height()))
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break;
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for (int x = 0; bm2.Find(&x, &my) && my == y; x++)
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wtr->scanline[x>>3] |= 128>>(x&7);
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if ((rval = BMPwriteScanline(wtr)) != BIR_OK)
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break;
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}
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BMPcloseOutput(wtr);
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if (rval != BIR_OK) {
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DMESG(DMCdata, BMPerrorMessage(rval));
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return false;
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}
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return true;
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}
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// Function to read a bitmap from a BMP file
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bool
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ReadBitMap(ABitMap *bmp, const char *fname)
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{
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if (bmp == NULL || fname == NULL || !*fname)
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return false;
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// open call reads 1st scanline
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BMPReader * rdr = BMPopenInputFile(fname);
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if (rdr == NULL) {
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DMESGF(DMCresource, "Cannot open BMP input file '%s'", fname);
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return false;
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}
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if (rdr->hdr->nColors > 2) {
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DMESGF(DMCdata, "BMP input file '%s' is not a bitmap", fname);
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BMPcloseInput(rdr);
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return false;
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}
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if (rdr->hdr->height != 1) {
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DMESGF(DMCdata, "BMP input file '%s' has more than one scan line", fname);
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BMPcloseInput(rdr);
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return false;
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}
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if (rdr->hdr->infoSiz <= 0 ||
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strncmp(BMPinfo(rdr->hdr), BitMap1Dmagic, rdr->hdr->infoSiz))
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DMESGF(DMCwarning, "BMP file '%s' not flagged as 1-D bitmap", fname);
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DASSERT(rdr->yscan == 0);
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DMESGF(DMCtrace, "Reading 1-D bitmap from '%s'", fname);
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bmp->NewBitMap(rdr->hdr->width);
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for (uint32 i = rdr->hdr->width; i--; )
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if (rdr->scanline[i>>3] & 128>>(i&7))
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bmp->Set(i);
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if (rdr->hdr->palette[0].g >= 128)
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bmp->Invert(); // against normal convention!
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BMPcloseInput(rdr);
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return true;
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}
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// Function to read a 2-D bitmap from a BMP file
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bool
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ReadBitMap2(ABitMap2 *bm2p, const char *fname)
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{
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if (bm2p == NULL || fname == NULL || !*fname)
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return false;
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BMPReader * rdr = BMPopenInputFile(fname);
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if (rdr == NULL) {
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DMESGF(DMCresource, "Cannot open BMP input file '%s'", fname);
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return false;
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}
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if (rdr->hdr->nColors > 2) {
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DMESGF(DMCdata, "BMP input file '%s' is not a bitmap", fname);
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BMPcloseInput(rdr);
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return false;
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}
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if (rdr->hdr->infoSiz <= 0 ||
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strncmp(BMPinfo(rdr->hdr), BitMap2Dmagic, rdr->hdr->infoSiz))
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DMESGF(DMCwarning, "BMP file '%s' not flagged as 2-D bitmap", fname);
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int y, rval = BIR_OK;
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bm2p->NewBitMap(rdr->hdr->width, rdr->hdr->height);
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DMESGF(DMCtrace, "Reading 2-D bitmap from '%s'", fname);
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for (y = 0; y < rdr->hdr->height; y++) {
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const int my = rdr->hdr->yIsDown ? y
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: rdr->hdr->height-1 - y;
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while (rdr->yscan < y && (rval = BMPreadScanline(rdr)) == BIR_OK)
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;
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if (rval != BIR_OK)
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break;
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for (uint32 x = rdr->hdr->width; x--; )
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if (rdr->scanline[x>>3] & 128>>(x&7))
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bm2p->Set(x, my);
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}
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if (rval == BIR_OK && rdr->hdr->palette[0].g >= 128)
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bm2p->Invert(); // against normal convention!
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BMPcloseInput(rdr);
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if (rval != BIR_OK) {
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bm2p->NewBitMap(0,0);
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sprintf(dmessage_buf, "%s at y==%d", BMPerrorMessage(rval), y);
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DMESG(DMCdata, dmessage_buf);
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return false;
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}
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return true;
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}
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