wincebitmap.cpp

swain-0.5.2.zip的源代码,比较好用,希望大家喜欢.

/*
This file is part of SWAIN (http://sourceforge.net/projects/swain).
Copyright (C) 2006  Daniel Lindstr鰉 and Daniel Nilsson

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA  02110-1301, USA.
*/
#include "StdAfx.h"
#include "WinCEBitmap.h"
#include "wince_drawing.h"	// needed for g_hWndDrawingWindow
#include <imaging.h>
#include <initguid.h>
#include <imgguids.h>

WinCEBitmap::WinCEBitmap(WCHAR *filename, bool rotate) {
    IImagingFactory *pImgFactory = NULL;
    IImage *pImage = NULL, *pImageRot = NULL;
	ImageInfo imageInfo;
    RECT rc;
	IBitmapImage *bm = NULL, *bmrot = NULL;
	IBasicBitmapOps *bbo = NULL;

	bool success = false;

    CoInitializeEx(NULL, COINIT_MULTITHREADED);

    // Create the imaging factory.
    if (FAILED(CoCreateInstance (CLSID_ImagingFactory,
                                 NULL,
                                 CLSCTX_INPROC_SERVER,
                                 IID_IImagingFactory,
                                 (void **)&pImgFactory))) {
		goto create_instance_failed;
	}
    // Load the image from the JPG file.
    if (FAILED(pImgFactory->CreateImageFromFile(filename, &pImage))) {
		goto create_image_failed;
	}
	if (FAILED(pImgFactory->CreateBitmapFromImage(pImage, 0, 0, 0, InterpolationHintDefault, &bm))) {
		goto create_bitmap_failed;
	}
	if (FAILED(bm->QueryInterface(IID_IBasicBitmapOps, (void **)&bbo))) {
		goto query_interface1_failed;
	}
	if (FAILED(bbo->Rotate((rotate ? 90.0f : 0.0f), InterpolationHintDefault, &bmrot))) {
		goto rotate_failed;
	}
	if (FAILED(bmrot->QueryInterface(IID_IImage, (void **)&pImageRot))) {
		goto query_interface2_failed;
	}
	// Find the size of the image
	if (FAILED(pImageRot->GetImageInfo(&imageInfo))) {
		goto image_info_failed;
	}
	rc.left = rc.top = 0;
	rc.right = width = imageInfo.Width;
	rc.bottom = height = imageInfo.Height;

	// Create a offscreen bitmap and device context
	HDC winhdc = GetDC(g_hWndDrawingWindow);
	hdc = CreateCompatibleDC(winhdc);
	bitmap = CreateCompatibleBitmap(winhdc, imageInfo.Width, imageInfo.Height);
	SelectObject(hdc, bitmap);
	// Draw the image.
	pImageRot->Draw(hdc, &rc, NULL);
	success = true;
	
image_info_failed:
	pImageRot->Release();
query_interface2_failed:
	bmrot->Release();
rotate_failed:
	bbo->Release();
query_interface1_failed:
	bm->Release();
create_bitmap_failed:
	pImage->Release();
create_image_failed:
    pImgFactory->Release();
create_instance_failed:
	
    CoUninitialize();

	if (!success) {
		throw "Image loading failed!";
	}
}

WinCEBitmap::~WinCEBitmap(void) {
	DeleteDC(hdc);
	DeleteObject(bitmap);
}

HDC WinCEBitmap::getHDC() {
	return hdc;
}

int WinCEBitmap::getWidth() {
	return width;
}

int WinCEBitmap::getHeight() {
	return height;
}