This code make odd colors to png-file.
LodePNG source files can found from:
http://members.gamedev.net/lode/projects/LodePNG/ (http://members.gamedev.net/lode/projects/LodePNG/)
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include "lodepng.h"
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpszCmdLine, int nCmdShow)
{
HDC hDC;
if ((hDC = GetDC(NULL)) != NULL) {
HDC hMemDC;
if ((hMemDC = CreateCompatibleDC(hDC)) != NULL) {
int x = GetSystemMetrics(SM_CXSCREEN);
int y = GetSystemMetrics(SM_CYSCREEN);
//x = 100; y = 100;
HBITMAP hBmp = CreateCompatibleBitmap(hDC, x, y);
if (hBmp) {
HBITMAP hOldBmp = SelectObject(hMemDC, hBmp);
// from screen to memory
//BitBlt(hMemDC, 0, 0, x, y, hDC, 0, 0, SRCCOPY);
//StretchBlt(hMemDC, 0, 0, x, y, hDC, 0, 0, x, y, SRCCOPY);
StretchBlt(hMemDC, 0, y, x, -y, hDC, 0, 0, x, y, SRCCOPY);
//
BITMAPINFO bmi;
memset(&bmi, 0, sizeof(BITMAPINFO));
bmi.bmiHeader.biSize = sizeof(BITMAPINFO);
DWORD nSize;
GetDIBits(hDC, hBmp, 0, 0, NULL, &bmi, DIB_RGB_COLORS);
BYTE *pBuf, *pImg;
pImg = GlobalAlloc(GPTR, bmi.bmiHeader.biSizeImage);
if (GetDIBits(hDC, hBmp, 0, bmi.bmiHeader.biHeight, pImg, &bmi, DIB_RGB_COLORS))
{
LodePNG_Encoder encoder;
/*create encoder and set settings and info (optional) */
LodePNG_Encoder_init(&encoder);
//encoder.settings.zlibsettings.windowSize = 2048;
encoder.settings.zlibsettings.windowSize = 4096;
//LodePNG_Text_add(&encoder.infoPng.text, "Comment", "Created with LodePNG");
/*encode and save */
LodePNG_encode(&encoder, &pBuf, &nSize, pImg, bmi.bmiHeader.biWidth, bmi.bmiHeader.biHeight);
LodePNG_saveFile(pBuf, nSize, "test1.png");
/*cleanup */
LodePNG_Encoder_cleanup(&encoder);
}
if (pImg)
GlobalFree(pImg);
DeleteObject(hBmp);
DeleteObject(hOldBmp);
}
DeleteDC(hMemDC);
}
ReleaseDC(NULL, hDC);
}
return 0;
}
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include "lodepng.h"
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpszCmdLine, int nCmdShow)
{
HDC hDC;
if ((hDC = GetDC(NULL)) != NULL) {
HDC hMemDC;
if ((hMemDC = CreateCompatibleDC(hDC)) != NULL) {
int x = GetSystemMetrics(SM_CXSCREEN);
int y = GetSystemMetrics(SM_CYSCREEN);
HBITMAP hBmp = CreateCompatibleBitmap(hDC, x, y);
if (hBmp) {
HBITMAP hOldBmp = SelectObject(hMemDC, hBmp);
// from screen to memory
StretchBlt(hMemDC, 0, y, x, -y, hDC, 0, 0, x, y, SRCCOPY);
//
BITMAPINFO bmi;
memset(&bmi, 0, sizeof(BITMAPINFO));
bmi.bmiHeader.biSize = sizeof(BITMAPINFO);
DWORD nSize;
GetDIBits(hDC, hBmp, 0, 0, NULL, &bmi, DIB_RGB_COLORS);
BYTE *pBuf, *pImg;
pImg = GlobalAlloc(GPTR, bmi.bmiHeader.biSizeImage);
if (GetDIBits(hDC, hBmp, 0, bmi.bmiHeader.biHeight, pImg, &bmi, DIB_RGB_COLORS))
LodePNG_encode32f("test1.png", pImg, bmi.bmiHeader.biWidth, bmi.bmiHeader.biHeight);
if (pImg)
GlobalFree(pImg);
DeleteObject(hBmp);
DeleteObject(hOldBmp);
}
DeleteDC(hMemDC);
}
ReleaseDC(NULL, hDC);
}
return 0;
}