Converting PDF to Bitmap with the help of PDFium and EasyBMP

pdf2bmp.cc

//for detail, please visit 
//http://blog.rubypdf.com/2014/07/08/convert-pdf-to-bitmap-with-pdfium
//do not forget #include "EasyBMP.h" first
static void WriteBmp(const char* pdf_name, int num,
                     const char* buffer, int stride
                     , int width, int height) {
	BMP bmp;
	bmp.SetSize(width,height);
	// Set its color depth to 32-bits
	bmp.SetBitDepth(32);

	// Set the pixels
	for (int h = 0; h < height; ++h) {
		const char* src_line = buffer + (stride * h);
		for (int w = 0; w < width; ++w) {
			bmp(w,h)->Red = src_line[(w * 4) + 2];
			bmp(w,h)->Green = src_line[(w * 4) + 1];
			bmp(w,h)->Blue = src_line[w * 4];
			bmp(w,h)->Alpha = 0;
		}
	}

	char filename[256];
	snprintf(filename, sizeof(filename), "%s.%d.bmp", pdf_name, num);
 
	bmp.WriteToFile(filename);
}