Initial community commit

Src/bmp/BMPWriter.cpp

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