cpu_anim结构体解析

最新推荐文章于 2024-09-27 16:33:51 发布

武泗海

最新推荐文章于 2024-09-27 16:33:51 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/qq_17239003/article/details/51052642

本文介绍了一个名为CPUAnimBitmap的结构体，该结构体用于处理图像动画，并提供了动画渲染和交互功能。文章详细解释了结构体成员变量的作用，如像素指针、图像尺寸等，同时介绍了用于动画渲染及鼠标点击拖拽事件处理的函数指针。

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/*
* Copyright 1993-2010 NVIDIA Corporation. All rights reserved.
*
* NVIDIA Corporation and its licensors retain all intellectual property and
* proprietary rights in and to this software and related documentation.
* Any use, reproduction, disclosure, or distribution of this software
* and related documentation without an express license agreement from
* NVIDIA Corporation is strictly prohibited.
*
* Please refer to the applicable NVIDIA end user license agreement (EULA)
* associated with this source code for terms and conditions that govern
* your use of this NVIDIA software.
*
*/

#ifndef __CPU_ANIM_H__
#define __CPU_ANIM_H__

#include "gl_helper.h"

#include <iostream>

struct CPUAnimBitmap {
unsigned char *pixels;//指向图像的像素点的指针
int width, height;//图像宽度和长度
void *dataBlock; //数据块
void (*fAnim)(void*,int); //函数指针声明:无返回类型，输入参数为指针和证书
void (*animExit)(void*); //函数指针声明：无返回类型，输入参数为指针
void (*clickDrag)(void*,int,int,int,int);//函数指针声明，无返回类型，输入参数为指针和四个整数
int dragStartX, dragStartY;//起点坐标定义

//CPUAnimBitmap结构体构造函数
CPUAnimBitmap( int w, int h, void *d = NULL ) {
width = w;
height = h;
pixels = new unsigned char[width * height * 4];
dataBlock = d;
clickDrag = NULL;
}
//CPUAnimBitmap结构体析构函数
~CPUAnimBitmap() {
delete [] pixels;
}
//返回像素点指针
unsigned char* get_ptr( void ) const { return pixels; }
//返回像素点尺寸
long image_size( void ) const { return width * height * 4; }

void click_drag( void (*f)(void*,int,int,int,int)) {
clickDrag = f;
}
//绘制图像动画并退出
void anim_and_exit( void (*f)(void*,int), void(*e)(void*) ) {
CPUAnimBitmap** bitmap = get_bitmap_ptr();
*bitmap = this;
fAnim = f;
animExit = e;
// a bug in the Windows GLUT implementation prevents us from
// passing zero arguments to glutInit()
int c=1;
char* dummy = "";
glutInit( &c, &dummy );
glutInitDisplayMode( GLUT_DOUBLE | GLUT_RGBA );
glutInitWindowSize( width, height );
glutCreateWindow( "bitmap" );
glutKeyboardFunc(Key);
glutDisplayFunc(Draw);
if (clickDrag != NULL)
glutMouseFunc( mouse_func );
glutIdleFunc( idle_func );
glutMainLoop();
}
//静态方法用于gult回调
// static method used for glut callbacks
static CPUAnimBitmap** get_bitmap_ptr( void ) {
static CPUAnimBitmap* gBitmap;
return &gBitmap;
}
//静态方法用于gult回调
// static method used for glut callbacks
static void mouse_func( int button, int state,
int mx, int my ) {
if (button == GLUT_LEFT_BUTTON) {
CPUAnimBitmap* bitmap = *(get_bitmap_ptr());
if (state == GLUT_DOWN) {
bitmap->dragStartX = mx;
bitmap->dragStartY = my;
} else if (state == GLUT_UP) {
bitmap->clickDrag( bitmap->dataBlock,
bitmap->dragStartX,
bitmap->dragStartY,
mx, my );
}
}
}
//静态方法用于gult回调
// static method used for glut callbacks
static void idle_func( void ) {
static int ticks = 1;
CPUAnimBitmap* bitmap = *(get_bitmap_ptr());
bitmap->fAnim( bitmap->dataBlock, ticks++ );
glutPostRedisplay();
}
//静态方法用于gult回调
// static method used for glut callbacks
static void Key(unsigned char key, int x, int y) {
switch (key) {
case 27:
CPUAnimBitmap* bitmap = *(get_bitmap_ptr());
bitmap->animExit( bitmap->dataBlock );
//delete bitmap;
exit(0);
}
}
//静态方法用于gult回调
// static method used for glut callbacks
static void Draw( void ) {
CPUAnimBitmap* bitmap = *(get_bitmap_ptr());
glClearColor( 0.0, 0.0, 0.0, 1.0 );
glClear( GL_COLOR_BUFFER_BIT );
glDrawPixels( bitmap->width, bitmap->height, GL_RGBA, GL_UNSIGNED_BYTE, bitmap->pixels );
glutSwapBuffers();
}
};

#endif // __CPU_ANIM_H__