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I modified this StretchBlt sample to provide non-uniform scaling of image, plus two ways to scale it - via stretchblt() and via stretchdibits() -- to test both functions in ReactOS.

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If anyone is strictly against me modifiying this sample from the book -- tell me, and I will create stretchblt2 then. But I think this is unncessary.

svn path=/trunk/; revision=8347
This commit is contained in:
Aleksey Bragin 2004-02-24 08:05:13 +00:00
parent b13d239f87
commit dcbe451792
1 changed files with 155 additions and 41 deletions
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196
reactos/apps/tests/stretchblt/stretchblt.cpp
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@ -10,14 +10,22 @@
// if you have any questions about this code.
// ------------------------------------------------------------------
// Modified by Aleksey Bragin (aleksey at studiocerebral.com)
// to support non-uniform scaling, and output via sretchdibits
// (type something in the command line to invoke this mode,
// in future it will be source BPP)
//>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
#include <windows.h>
#include <stdio.h>
//<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
HWND HListBox = NULL;
HWND VListBox = NULL;
const int ID_LISTBOX = 101;
const int ID_LISTBOX2 = 102;
BOOL useDIBits=FALSE; // How to display the image - via StretchDIBits
HINSTANCE HInst;
HINSTANCE HPrevInst;
@ -47,7 +55,7 @@ int APIENTRY WinMain(HINSTANCE HInstance, HINSTANCE HPrevInstance,
if (RegisterClass(&wc))
{
HWND HWnd =
CreateWindow(WndClassName, TEXT("StretchBlt Zooming Demo"),
CreateWindow(WndClassName, TEXT("StretchBlt NonUniform Zooming Demo"),
WS_OVERLAPPEDWINDOW | WS_CAPTION |
WS_VISIBLE | WS_CLIPSIBLINGS,
0, 0, 675, 560,
@ -61,8 +69,16 @@ int APIENTRY WinMain(HINSTANCE HInstance, HINSTANCE HPrevInstance,
530, 5, 130, 150, HWnd,
reinterpret_cast<HMENU>(ID_LISTBOX),
HInst, NULL);
if (HListBox)
VListBox =
CreateWindowEx(WS_EX_CLIENTEDGE, "LISTBOX", "",
LBS_NOTIFY | WS_CHILD | WS_VISIBLE,
530, 5+170, 130, 150, HWnd,
reinterpret_cast<HMENU>(ID_LISTBOX2),
HInst, NULL);
if (HListBox && VListBox)
{
// horizontal zoom
SNDMSG(HListBox, LB_ADDSTRING, 0,
reinterpret_cast<LPARAM>("Zoom 25%"));
SNDMSG(HListBox, LB_ADDSTRING, 0,
@ -79,6 +95,24 @@ int APIENTRY WinMain(HINSTANCE HInstance, HINSTANCE HPrevInstance,
reinterpret_cast<LPARAM>("Zoom 200%"));
SNDMSG(HListBox, LB_ADDSTRING, 0,
reinterpret_cast<LPARAM>("Zoom 300%"));
// vertical zoom
SNDMSG(VListBox, LB_ADDSTRING, 0,
reinterpret_cast<LPARAM>("Zoom 25%"));
SNDMSG(VListBox, LB_ADDSTRING, 0,
reinterpret_cast<LPARAM>("Zoom 50%"));
SNDMSG(VListBox, LB_ADDSTRING, 0,
reinterpret_cast<LPARAM>("Zoom 75%"));
SNDMSG(VListBox, LB_ADDSTRING, 0,
reinterpret_cast<LPARAM>("Zoom 100%"));
SNDMSG(VListBox, LB_ADDSTRING, 0,
reinterpret_cast<LPARAM>("Zoom 125%"));
SNDMSG(VListBox, LB_ADDSTRING, 0,
reinterpret_cast<LPARAM>("Zoom 150%"));
SNDMSG(VListBox, LB_ADDSTRING, 0,
reinterpret_cast<LPARAM>("Zoom 200%"));
SNDMSG(VListBox, LB_ADDSTRING, 0,
reinterpret_cast<LPARAM>("Zoom 300%"));
}
ShowWindow(HWnd, nCmdShow);
@ -99,12 +133,15 @@ int APIENTRY WinMain(HINSTANCE HInstance, HINSTANCE HPrevInstance,
// image related
BITMAP bmp;
BITMAPINFO bmInfo;
char *bbits = NULL; // bitmap bits
const char* filename = "LENA.BMP";
HDC HMemDC = NULL;
HBITMAP HOldBmp = NULL;
// zooming related
float zoom_factor = 0.5;
float zoom_factor_h = 0.5;
float zoom_factor_v = 0.5;
RECT RDest = {5, 5, 0, 0};
enum {ID_ZOOM25, ID_ZOOM50, ID_ZOOM75, ID_ZOOM100,
ID_ZOOM125, ID_ZOOM150, ID_ZOOM200, ID_ZOOM300};
@ -116,6 +153,15 @@ LRESULT CALLBACK MainWndProc(HWND HWnd, UINT Msg, WPARAM WParam,
{
case WM_CREATE:
{
// check commandline
if (strlen(cmdline) != 0)
{
useDIBits = TRUE;
}
else
useDIBits = FALSE;
// create a memory DC
HMemDC = CreateCompatibleDC(NULL);
if (HMemDC)
@ -131,34 +177,76 @@ LRESULT CALLBACK MainWndProc(HWND HWnd, UINT Msg, WPARAM WParam,
// extract dimensions of the bitmap
GetObject(HBmp, sizeof(BITMAP), &bmp);
// associate the bitmap with the memory DC
// fill the BITMAPINFO stucture for further use by StretchDIBits
bmInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmInfo.bmiHeader.biWidth = bmp.bmWidth;
bmInfo.bmiHeader.biHeight = bmp.bmHeight;
bmInfo.bmiHeader.biPlanes = 1;//bmp.bmPlanes;
bmInfo.bmiHeader.biBitCount = bmp.bmBitsPixel;
bmInfo.bmiHeader.biCompression = BI_RGB;
bmInfo.bmiHeader.biSizeImage = 0;
bmInfo.bmiHeader.biXPelsPerMeter = 0;
bmInfo.bmiHeader.biClrImportant = 0;
bmInfo.bmiHeader.biClrUsed = 0;
// associate the bitmap with the memory DC
HOldBmp = static_cast<HBITMAP>(
SelectObject(HMemDC, HBmp)
);
if (useDIBits)
{
bbits = new char[bmp.bmHeight*bmp.bmWidthBytes*(bmp.bmBitsPixel / 8)];
//GetDIBits(HMemDC, HBmp, 0, bmp.bmHeight, bbits, &bmInfo, DIB_RGB_COLORS);
// Here goes a temp hack, since GetDIBits doesn't exist in ReactOS yet
FILE *f = fopen(filename, "rb");
BITMAPFILEHEADER bmpHeader;
fread(&bmpHeader, sizeof(BITMAPFILEHEADER), 1, f);
fread(&bmInfo, sizeof(BITMAPINFO), 1, f);
fseek(f, bmpHeader.bfOffBits, SEEK_SET);
fread(bbits, bmp.bmHeight*bmp.bmWidthBytes*(bmp.bmBitsPixel / 8), 1, f);
fclose(f);
}
}
}
}
case WM_COMMAND:
{
if (WParam == MAKEWPARAM(ID_LISTBOX, LBN_SELCHANGE))
if (WParam == MAKEWPARAM(ID_LISTBOX, LBN_SELCHANGE) ||
WParam == MAKEWPARAM(ID_LISTBOX2, LBN_SELCHANGE))
{
switch (SNDMSG(HListBox, LB_GETCURSEL, 0, 0))
{
case ID_ZOOM25: zoom_factor = 0.25; break;
case ID_ZOOM50: zoom_factor = 0.50; break;
case ID_ZOOM75: zoom_factor = 0.75; break;
case ID_ZOOM100: zoom_factor = 1.00; break;
case ID_ZOOM125: zoom_factor = 1.25; break;
case ID_ZOOM150: zoom_factor = 1.50; break;
case ID_ZOOM200: zoom_factor = 2.00; break;
case ID_ZOOM300: zoom_factor = 3.00; break;
case ID_ZOOM25: zoom_factor_h = 0.25; break;
case ID_ZOOM50: zoom_factor_h = 0.50; break;
case ID_ZOOM75: zoom_factor_h = 0.75; break;
case ID_ZOOM100: zoom_factor_h = 1.00; break;
case ID_ZOOM125: zoom_factor_h = 1.25; break;
case ID_ZOOM150: zoom_factor_h = 1.50; break;
case ID_ZOOM200: zoom_factor_h = 2.00; break;
case ID_ZOOM300: zoom_factor_h = 3.00; break;
}
switch (SNDMSG(VListBox, LB_GETCURSEL, 0, 0))
{
case ID_ZOOM25: zoom_factor_v = 0.25; break;
case ID_ZOOM50: zoom_factor_v = 0.50; break;
case ID_ZOOM75: zoom_factor_v = 0.75; break;
case ID_ZOOM100: zoom_factor_v = 1.00; break;
case ID_ZOOM125: zoom_factor_v = 1.25; break;
case ID_ZOOM150: zoom_factor_v = 1.50; break;
case ID_ZOOM200: zoom_factor_v = 2.00; break;
case ID_ZOOM300: zoom_factor_v = 3.00; break;
}
// calculate the new width and height
const int new_width =
static_cast<int>(zoom_factor * bmp.bmWidth);
static_cast<int>(zoom_factor_h * bmp.bmWidth);
const int new_height =
static_cast<int>(zoom_factor * bmp.bmHeight);
static_cast<int>(zoom_factor_v * bmp.bmHeight);
// is zooming in?
bool zoom_in = (new_width > RDest.right - RDest.left);
@ -210,34 +298,57 @@ LRESULT CALLBACK MainWndProc(HWND HWnd, UINT Msg, WPARAM WParam,
//
// TODO: add palette support (see Chapter 9)...
//
if (useDIBits)
{
if (RDest.right - RDest.left > 0)
{
if (zoom_factor_h < 1.0 || zoom_factor_v < 1.0)
{
SetStretchBltMode(Hdc, COLORONCOLOR);
}
if (RDest.right - RDest.left > 0)
{
// use BitBlt when not zooming
if (zoom_factor == 1.0)
{
BitBlt(Hdc, RDest.left, RDest.top,
RDest.right - RDest.left,
RDest.bottom - RDest.top,
HMemDC, 0, 0,
SRCCOPY);
}
else
{
if (zoom_factor < 1.0)
{
SetStretchBltMode(Hdc, COLORONCOLOR);
}
// render the zoomed image
StretchDIBits(Hdc, RDest.left, RDest.top,
RDest.right - RDest.left,
RDest.bottom - RDest.top,
0, 0,
bmp.bmWidth, bmp.bmHeight,
bbits, &bmInfo,
DIB_RGB_COLORS,
SRCCOPY);
}
}
else
{
if (RDest.right - RDest.left > 0)
{
// use BitBlt when not zooming
if (zoom_factor_h == 1.0 && zoom_factor_v == 1.0)
{
BitBlt(Hdc, RDest.left, RDest.top,
RDest.right - RDest.left,
RDest.bottom - RDest.top,
HMemDC, 0, 0,
SRCCOPY);
}
else
{
if (zoom_factor_h < 1.0 || zoom_factor_v < 1.0)
{
SetStretchBltMode(Hdc, COLORONCOLOR);
}
// render the zoomed image
StretchBlt(Hdc, RDest.left, RDest.top,
RDest.right - RDest.left,
RDest.bottom - RDest.top,
HMemDC, 0, 0,
bmp.bmWidth, bmp.bmHeight,
SRCCOPY);
}
}
// render the zoomed image
StretchBlt(Hdc, RDest.left, RDest.top,
RDest.right - RDest.left,
RDest.bottom - RDest.top,
HMemDC, 0, 0,
bmp.bmWidth, bmp.bmHeight,
SRCCOPY);
}
}
}
}
#if 0
catch (...)
@ -254,6 +365,9 @@ LRESULT CALLBACK MainWndProc(HWND HWnd, UINT Msg, WPARAM WParam,
DeleteObject(SelectObject(HMemDC, HOldBmp));
DeleteDC(HMemDC);
if (bbits)
delete bbits;
PostQuitMessage(0);
return 0;
}