i developing own image format game , other applications , want make image viewer of images. problem is, when try render bigger image (1920x1080), takes atleast 10 seconds , application stops responding few seconds , disappears.
class renderer{ //... inline void getrgb(unsigned int color,unsigned char &r,unsigned char &g,unsigned char &b){ r=((color>>16)&0xff); g=((color>>8)&0xff); b=((color)&0xff); } inline bool isvalidpos(unsigned int x,unsigned int y){ if((x>=0&&x<width)&&(y>=0&&y<height))return true; else return false; } inline void getpoint(unsigned int x,unsigned int y,unsigned int &color){ if(isvalidpos(x,y)) color=photostream[y*height+x]; } void drawpoint(unsigned int& x,unsigned int& y){ unsigned char r,g,b; unsigned int col; getpoint(x,y,col); //getrgb(col,r,g,b); setpixel(hdc,x,y,col); } }; void rendershmp(imageshmp<unsigned int>& img,renderer *renderer){ imageshmp<unsigned int> tmpimg(img.getx(),img.gety()); //create new image, 1 shown for(unsigned int x=0;x<tmpimg.getx();x++) for(unsigned int y=0;y<tmpimg.gety();y++) tmpimg.setpoint(x,y,img.getpoint(x,y)); //copy data if(img.getx()>width||img.gety()>height){ //resize image if bigger window resolution double scale=1.0; scale=static_cast<double>(width)/static_cast<double>(img.getx()); tmpimg.scale(scale); } //code above takes max. 0,2 seconds execute unsigned int col=0; for(unsigned int x=0;x<tmpimg.getx();x++) for(unsigned int y=0;y<tmpimg.gety();y++){ col=tmpimg.getpoint(x,y); renderer->setpoint(x,y,col); //sets color in memory later use renderer->drawpoint(x,y); } } imageshmp contains simple buffer of type t equal width*height. data saved in buffer, example point [20,30] located @ [30*height+20]. how make draw faster, window won't in "not responding" state? mean fast simple windows image viewer it.
final code:
void rendershmp(imageshmp<unsigned int>& img,renderer *renderer){ imageshmp<unsigned int> tmpimg(img.getx(),img.gety()); for(unsigned int x=0;x<tmpimg.getx();x++) for(unsigned int y=0;y<tmpimg.gety();y++) tmpimg.setpoint(x,y,img.getpoint(x,y)); if(img.getx()>width||img.gety()>height){ double scale=1.0; scale=static_cast<double>(width)/static_cast<double>(img.getx()); tmpimg.scale(scale); } int w=tmpimg.getx(),h=tmpimg.gety(); unsigned char r=0,g=0,b=0; bitmapinfo bmi; hbitmap hbm; unsigned char *bytes=new unsigned char[w*h*3]; hdc hdc; renderer->gethdc(hdc); unsigned int ctr=0; zeromemory(&bmi, sizeof(bmi)); bmi.bmiheader.bisize = sizeof(bmi.bmiheader); bmi.bmiheader.biwidth = w; bmi.bmiheader.biheight = h; bmi.bmiheader.biplanes = 1; bmi.bmiheader.bibitcount = 24; bmi.bmiheader.bicompression = bi_rgb; hbm = createdibsection(hdc, &bmi, dib_rgb_colors,(void **)&bytes, null, 0); hdc compatibledc=createcompatibledc(hdc); hbitmap hbmp = createcompatiblebitmap (hdc, w, h); for(int y=int(h)-1;y>=0;--y){ for(int x=0;x<int(w);++x){ renderer->getrgb(tmpimg.getpoint(x,y),r,g,b); bytes[ctr++]=b; bytes[ctr++]=g; bytes[ctr++]=r; } } setdibits (hdc, hbmp, 0, h, bytes,&bmi, dib_rgb_colors); hbmp=(hbitmap)selectobject (compatibledc, hbmp); bitblt(hdc, 0, 0, w, h, compatibledc, 0, 0, srccopy); deleteobject(selectobject(compatibledc, hbmp)); deletedc(compatibledc); delete [] bytes; }
calling setpixel 2m times take bit of time. think you'd better of resizing image bitmap, , drawing screen. use example createdibsection, , populate via ppvbits, , use bitblit() draw screen itself.
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