88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
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#include "BMPWriter.h"
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#include "api__bmp.h"
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#include <wchar.h>
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#include <bfc/platform/strcmp.h>
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// valid items include "quality" for jpeg files with value "0" to "100"
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// return value is 1 if the config item is supported, 0 if it is not.
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int BMPWriter::setConfig(const wchar_t * item, const wchar_t * value) {
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return 0; // no config yet
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}
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// valid items include "quality" for jpeg files with value "0" to "100", "lossless" returns "1" if it is "0" otherwise
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// return value is 1 if the config item is supported, 0 if it is not.
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int BMPWriter::getConfig(const wchar_t * item, wchar_t * value, int valuelen) {
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if(!_wcsicmp(item,L"lossless")) lstrcpynW(value,L"1",valuelen);
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else return 0;
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return 1;
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}
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// returns 1 if the bit depth is supported (eg 32 for ARGB32, 24 for RGB24)
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// ARGB32 MUST be supported
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int BMPWriter::bitDepthSupported(int depth) {
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if(depth == 32 || depth == 24) return 1;
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return 0;
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}
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// returns the image in our format, free the returned buffer with api_memmgr::sysFree()
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void * BMPWriter::convert(const void *pixels, int bitDepth, int w, int h, int *length) {
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if(bitDepth != 32 && bitDepth != 24) return 0;
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int pixDataSize = (w * h * (bitDepth/8));
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int headersSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
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*length = pixDataSize + headersSize;
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BITMAPFILEHEADER fileHeader={0};
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fileHeader.bfType = 'MB';
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fileHeader.bfSize = *length;
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fileHeader.bfOffBits = headersSize;
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BITMAPINFOHEADER infoHeader={0};
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infoHeader.biSize = sizeof(BITMAPINFOHEADER);
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infoHeader.biWidth = w;
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infoHeader.biHeight = h;
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infoHeader.biPlanes = 1;
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infoHeader.biBitCount = bitDepth;
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infoHeader.biCompression = BI_RGB;
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infoHeader.biSizeImage = pixDataSize;
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infoHeader.biXPelsPerMeter = 2834; //72ppi
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infoHeader.biYPelsPerMeter = 2834; //72ppi
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infoHeader.biClrUsed = 0;
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infoHeader.biClrImportant = 0;
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/*
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The structure of bitmap files is like this:
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fileheader
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infoheader
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palette (optional)
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data
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*/
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BYTE * bmp = (BYTE *)WASABI_API_MEMMGR->sysMalloc(*length);
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if(!bmp) return 0;
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memcpy(bmp,&fileHeader,sizeof(BITMAPFILEHEADER));
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memcpy(bmp + sizeof(BITMAPFILEHEADER),&infoHeader,sizeof(BITMAPINFOHEADER));
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//memcpy(bmp + headersSize,pixels,pixDataSize);
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{
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BYTE *pOut = bmp + headersSize;
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BYTE *pIn = ((BYTE*)pixels) + w*h*(bitDepth/8);
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int d = w*(bitDepth/8);
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for(int i=0; i<h; i++) {
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pIn-=d;
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memcpy(pOut,pIn,d);
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pOut+=d;
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}
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}
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return bmp;
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}
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#define CBCLASS BMPWriter
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START_DISPATCH;
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CB(GETIMAGETYPENAME, getImageTypeName);
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CB(GETEXTENSIONS, getExtensions);
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CB(SETCONFIG, setConfig);
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CB(GETCONFIG, getConfig);
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CB(BITDEPTHSUPPORTED, bitDepthSupported);
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CB(CONVERT, convert);
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END_DISPATCH;
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#undef CBCLASS
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