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#ifndef lint |
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static const char RCSid[] = "$Id: abitmapio.cpp,v 2.2 2024/08/24 23:25:24 greg Exp $"; |
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#endif |
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/* |
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* abitmapio.cpp |
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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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*/ |
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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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|
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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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|
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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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|
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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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|
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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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|
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int rval = BMPwriteScanline(wtr); |
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|
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BMPcloseOutput(wtr); |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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BMPReader * rdr = BMPopenInputFile(fname); |
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|
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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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|
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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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|
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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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} |
