add changes file

[imager-screenshot.git] / scwin32.c

#include "imext.h"\r
#include <windows.h>\r
#include <string.h>\r
\r
i_img *\r
imss_win32(unsigned hwnd_u, int include_decor) {\r
  HWND hwnd = (HWND)hwnd_u;\r
  HDC wdc, bmdc;\r
  RECT rect;\r
  HBITMAP work_bmp, old_dc_bmp;\r
  int width, height;\r
  BITMAPINFO bmi;\r
  unsigned char *di_bits;\r
  i_img *result = NULL;\r
\r
  i_clear_error();\r
\r
  if (!hwnd)\r
    hwnd = GetDesktopWindow();\r
\r
  if (include_decor) {\r
    wdc = GetWindowDC(hwnd);\r
    GetWindowRect(hwnd, &rect);\r
  }\r
  else {\r
    wdc = GetDC(hwnd);\r
    GetClientRect(hwnd, &rect);\r
  }\r
  if (!wdc) {\r
    i_push_error(0, "Cannot get window DC - invalid hwnd?");\r
    return NULL;\r
  }\r
\r
  width = rect.right - rect.left;\r
  height = rect.bottom - rect.top;\r
  work_bmp = CreateCompatibleBitmap(wdc, width, height);\r
  bmdc = CreateCompatibleDC(wdc);\r
  old_dc_bmp = SelectObject(bmdc, work_bmp);\r
  BitBlt(bmdc, 0, 0, width, height, wdc, 0, 0, SRCCOPY);\r
\r
  /* make a dib */\r
  memset(&bmi, 0, sizeof(bmi));\r
  bmi.bmiHeader.biSize = sizeof(bmi);\r
  bmi.bmiHeader.biWidth = width;\r
  bmi.bmiHeader.biHeight = -height;\r
  bmi.bmiHeader.biPlanes = 1;\r
  bmi.bmiHeader.biBitCount = 32;\r
  bmi.bmiHeader.biCompression = BI_RGB;\r
\r
  di_bits = mymalloc(4 * width * height);\r
  if (GetDIBits(bmdc, work_bmp, 0, height, di_bits, &bmi, DIB_RGB_COLORS)) {\r
    i_color *line = mymalloc(sizeof(i_color) * width);\r
    i_color *cp;\r
    int x, y;\r
    unsigned char *ch_pp = di_bits;\r
    result = i_img_8_new(width, height, 3);\r
\r
    for (y = 0; y < height; ++y) {\r
      cp = line;\r
      for (x = 0; x < width; ++x) {\r
	cp->rgb.b = *ch_pp++;\r
	cp->rgb.g = *ch_pp++;\r
	cp->rgb.r = *ch_pp++;\r
	ch_pp++;\r
	cp++;\r
      }\r
      i_plin(result, 0, width, y, line);\r
    }\r
    myfree(line);\r
  }\r
\r
  /* clean up */\r
  myfree(di_bits);\r
  SelectObject(bmdc, old_dc_bmp);\r
  DeleteDC(bmdc);\r
  DeleteObject(work_bmp);\r
  ReleaseDC(hwnd, wdc);\r
\r
  return result;\r
}\r