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130 lines
3.5 KiB
C++
130 lines
3.5 KiB
C++
/*
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bmp15.cpp
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Copyright (C) 2007 Acekard, www.acekard.com
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Copyright (C) 2007-2009 somebody
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Copyright (C) 2009 yellow wood goblin
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SPDX-License-Identifier: GPL-3.0-or-later
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*/
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//<2F>
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#include "bmp15.h"
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#include <list>
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#include <string>
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#include "dbgtool.h"
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cBMP15::cBMP15() : _width(0), _height(0), _pitch(0), _buffer(NULL) {}
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cBMP15::cBMP15(u32 width, u32 height) : _width(0), _height(0), _pitch(0), _buffer(NULL) {
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_width = width;
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_height = height;
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_pitch = (width + (width & 1)) << 1;
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// u32 pitch = (((width*16)+31)>>5)<<2; // 通用算法？
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}
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cBMP15::~cBMP15() {
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// dbg_printf( "cBMP15 %08x destructed\n", this );
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}
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cBMP15 createBMP15(u32 width, u32 height) {
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cBMP15 bmp(width, height);
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u32 pitch = bmp.pitch(); // 15bit bmp pitch 算法
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// dbg_printf( "pitch: %d bytes\n", pitch );
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// dbg_printf( "buffer %08x\n", bmp.buffer() );
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u32 bufferSize = height * pitch;
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if (bufferSize & 3) // 如果 bufferSize 不是按4字节对齐，就把他调整到对齐
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bufferSize += 4 - (bufferSize & 3);
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bmp._buffer = new u32[bufferSize >> 2];
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return bmp;
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}
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typedef std::pair<std::string, cBMP15> str_bmp_pair;
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typedef std::list<str_bmp_pair> str_bmp_list;
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static str_bmp_list _bmpPool;
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cBMP15 createBMP15FromMem(void* mem) {
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return cBMP15();
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}
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cBMP15 createBMP15FromFile(const std::string& filename) {
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// dbg_printf( "createBMP15FromFile (%s)\n", filename );
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str_bmp_list::iterator it;
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for (it = _bmpPool.begin(); it != _bmpPool.end(); ++it) {
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if (filename == it->first) {
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return it->second;
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}
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}
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FILE* f = fopen(filename.c_str(), "rb");
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if (NULL == f) {
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dbg_printf("(%s) file does not exist\n", filename.c_str());
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return cBMP15();
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}
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// 读取文件长度
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fseek(f, 0, SEEK_END);
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int fileSize = ftell(f);
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if (-1 == fileSize) {
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fclose(f);
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return cBMP15();
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}
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u16 bmMark = 0;
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fseek(f, 0, SEEK_SET);
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fread(&bmMark, 1, 2, f);
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if (bmMark != 0x4d42) { // 'B' 'M' header
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dbg_printf("not a bmp file\n");
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fclose(f);
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return cBMP15();
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}
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// 找出bmp高和宽
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u32 width = 0;
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u32 height = 0;
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fseek(f, 0x12, SEEK_SET);
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fread(&width, 1, 4, f);
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fseek(f, 0x16, SEEK_SET);
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fread(&height, 1, 4, f);
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// dbg_printf( "w:%d h:%d\n", width, height );
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cBMP15 bmp = createBMP15(width, height);
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u32 bmpDataOffset = 0;
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fseek(f, 0x0a, SEEK_SET);
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fread(&bmpDataOffset, 1, 4, f);
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long position = bmpDataOffset;
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fseek(f, position, SEEK_SET);
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u16* pbuffer = ((u16*)bmp.buffer()) + (bmp.pitch() >> 1) * height - (bmp.pitch() >> 1);
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for (u32 i = 0; i < height; ++i) {
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fread(pbuffer, 1, bmp.pitch(), f);
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position += bmp.pitch();
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pbuffer -= bmp.pitch() >> 1;
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fseek(f, position, SEEK_SET);
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}
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fclose(f);
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pbuffer = (u16*)bmp.buffer();
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for (u32 i = 0; i < height; ++i) {
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for (u32 j = 0; j < (bmp.pitch() >> 1); ++j) {
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u16 pixelColor = pbuffer[i * (bmp.pitch() >> 1) + j];
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pixelColor = ((pixelColor & 0x7C00) >> 10) | ((pixelColor & 0x03E0)) |
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((pixelColor & 0x1F) << 10);
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pbuffer[i * (bmp.pitch() >> 1) + j] = pixelColor | (pixelColor ? BIT(15) : 0);
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// dbg_printf("%d %d\n", j, i );
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}
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}
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str_bmp_pair bmpPoolItem(std::string(filename), bmp);
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_bmpPool.push_back(bmpPoolItem);
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// dbg_printf( "load bmp success, %08x\n", bmp.buffer() );
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return bmp;
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}
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