如何解决使用TTF释放表面并破坏纹理后，SDL2内存使用并未完全减少
自从我开始使用SDL_TTF以来，这种情况一直在发生，但我无法找到原因。当我创建一个文本对象时，该程序永远处于ram使用量的x位置，直到我做某事为止（那里没有错）。然后，当我添加文本时，程序的ram使用率会增加。那里也没有错。但是，当我决定删除文本时，首先，由于某种原因，程序会从其at处增加使用率，然后按原样减少使用率，但是从没有减少过使用相同文本之前的使用率。如果我一直重复添加和减去文本，则内存只会保持缓慢上升。
这是我的意思：
之前
添加了文本
如果照片中不清楚，该程序将以102.8mb的内存使用开始。添加文本后，它会跳到104mb，然后在删除文本后，程序将恢复到103.6mb的使用率。到底是什么在使用额外的兆字节内存？
text.h
#ifndef TEXT_H
#define TEXT_H
#include <SDL2/SDL_ttf.h>
#include <SDL2/SDL.h>
#include "events.h"
#include <iostream>
#include <string>
#include <vector>
using std::vector;
using std::string;
using std::cout;
using std::endl;
using std::exception;
class Text
{
public:
Events EVENTS;
Text(void);
///Public variables
static vector <TTF_Font*> fonts;
const int lowestFontSize = 1;
const int highestFontSize = 100;
int fontIndex;
int textSize;
SDL_Rect textRect;
int x;
int y;
int initialX,initialY;
bool setup;
static int numOfInstances;
///Functions
void Setup(SDL_Renderer *renderer,string txt,int x,int y,int txtSize,SDL_Color Colour = {0,0},bool isBold = false,string fontType = "arial.ttf",bool isWrapped=false,int theWrapWidth=0);
string Get_Text();
void Change_Text(SDL_Renderer *renderer,string newText);
void Draw_Text(SDL_Renderer *renderer);
void Change_Position(SDL_Renderer *renderer,int xPos,int yPos);
void Change_Position_And_Text(SDL_Renderer *renderer,int yPos,string newText);
int Text_Width(int FirstCharIndex,int numOfCharsPastFirstIndex);
int Text_Height(int FirstCharIndex,int numOfCharsPastFirstIndex);
void Free_All();
private:
///SDL stuff
SDL_Texture *textTexture;
SDL_Surface *textSurface;
SDL_Color colour;
SDL_Point point;
///text varibales
string text;
int textW;
int textH;
bool bold;
bool wrapped;
int wrappedWidth;
};
#endif
text.cpp
#include "text.h"
int Text::numOfInstances = 0;
vector <TTF_Font*> Text::fonts;
Text::Text()
{
setup = false;
textTexture = NULL;
textSurface = NULL;
}
void Text::Setup(SDL_Renderer *renderer,SDL_Color Colour,bool isBold,string fontType,bool isWrapped,int theWrapWidth )
{
if (setup == false){
numOfInstances += 1;
wrapped = isWrapped;
wrappedWidth = theWrapWidth;
text = txt;
textSize = txtSize;
bold = isBold;
colour = Colour;
textW = 0;
textH = 0;
x = xPos;
y = yPos;
initialX = x;
initialY = y;
fontIndex = textSize-lowestFontSize -1;
///One time setups
if (numOfInstances == 1){
try{
TTF_Init();
//cout << "Initialised ttf" << endl;
}
catch (exception &err){
cout << "Could not initialise ttf for text \"" << text << "\". Error from SDL is: " << TTF_GetError() << ". Error from C++ is: " << err.what() << endl;
}
for (int i=lowestFontSize; i <= highestFontSize; i++){
TTF_Font *currentFont = TTF_OpenFont(fontType.c_str(),i);
if (!currentFont){
cout << "Error with font in text \"" << txt << "\" Error is: " << SDL_GetError() << endl;
}
//TTF_SetFontKerning(currentFont,0);
fonts.push_back(currentFont);
}
}
if (bold == true){
TTF_SetFontStyle(fonts[fontIndex],TTF_STYLE_BOLD);
}
if (!SDL_SetHint( SDL_HINT_RENDER_SCALE_QUALITY,"2" ) ){ ///2 is highest
cout << "Text rendering quality not enabled " << text << endl;
}
if (text != ""){ ///Only create textures if there is text
if (wrapped == true){
textSurface = TTF_RenderText_Blended_Wrapped(fonts[fontIndex],text.c_str(),colour,wrappedWidth); ///Recreate the textures/surfaces
}
else{
textSurface = TTF_RenderText_Blended(fonts[fontIndex],colour); ///Recreate the textures/surfaces
}
if (!textSurface){
cout << "Unable to create surface of text " << text << " error is: " << SDL_GetError() << endl;
}
textTexture = SDL_CreateTextureFromSurface(renderer,textSurface);
if (!textTexture){
cout << "Unable to create texture from surface of text " << text << " error is: " << SDL_GetError() << endl;
}
SDL_FreeSurface(textSurface);
textSurface = NULL;
SDL_QueryTexture(textTexture,NULL,&textW,&textH);
textRect = {x,y,textW,textH};
}
point = {0,0};
setup = true;
}
else{
//cout << "Trying to setup a text already setup! " << text << endl;
}
}
void Text::Change_Position_And_Text(SDL_Renderer *renderer,string newText )
{
if (setup == true){
text = newText;
x = xPos;
y = yPos;
textRect.x = x;
textRect.y = y;
if (textTexture != NULL){
SDL_DestroyTexture(textTexture); ///Free memory not going to be used again.
textTexture = NULL;
}
if (wrapped == true){
textSurface = TTF_RenderText_Blended_Wrapped(fonts[fontIndex],wrappedWidth); ///Recreate the textures/surfaces
}
else{
textSurface = TTF_RenderText_Blended(fonts[fontIndex],colour); ///Recreate the textures/surfaces
}
if (!textSurface){
cout << "Unable to create surface of text " << text << " error is: " << SDL_GetError() << endl;
}
textTexture = SDL_CreateTextureFromSurface(renderer,textSurface);
if (!textTexture){
cout << "Unable to create texture from surface of text " << text << " error is: " << SDL_GetError() << endl;
}
SDL_FreeSurface(textSurface);
textSurface = NULL;
SDL_QueryTexture(textTexture,&textH); ///neeed this
textRect = {x,textH};
}
}
void Text::Change_Position(SDL_Renderer *renderer,int yPos)
{
if (setup == true){
x = xPos;
y = yPos ;
textRect.x = xPos;
textRect.y = yPos;
}
}
void Text::Change_Text(SDL_Renderer *renderer,string newText)
{
if (setup == true){
text = newText;
if (textTexture != NULL){
SDL_DestroyTexture(textTexture); ///Free memory not going to be used again.
textTexture = NULL;
}
if (text != ""){
if (wrapped == true){
textSurface = TTF_RenderText_Blended_Wrapped(fonts[fontIndex],&textH); ///neeed this
textRect = {x,textH};
}
}
}
int Text::Text_Width(int FirstCharIndex,int numOfCharsPastFirstIndex)
{
int w,h;
string textSelection = text.substr(FirstCharIndex,numOfCharsPastFirstIndex);
TTF_SizeText(fonts[fontIndex],textSelection.c_str(),&w,&h);
return w;
}
int Text::Text_Height(int FirstCharIndex,&h);
return h;
}
string Text::Get_Text()
{
if (setup == true){
return text;
}
else{
return "";
//cout << "Text not setup when trying to obtain text through Get_Text() function" << endl;
}
}
void Text::Draw_Text(SDL_Renderer *renderer)
{
if (setup == true){
//cout << numOfInstances << endl;
if (SDL_PointInRect(&EVENTS.mousePos,&textRect) && EVENTS.currentCursor != SDL_SYstem_CURSOR_IBEAM){
EVENTS.Change_Cursor(SDL_SYstem_CURSOR_IBEAM);
}
SDL_Rendercopy(renderer,textTexture,&textRect);
}
else{
//cout << "Text not setup when trying to draw it in Draw_Text() function" << endl;
}
}
void Text::Free_All()
{
if (setup == true){
if (textSurface == NULL){
//cout << "Text surface already free'd" << endl;
}
else{
SDL_FreeSurface(textSurface);
textSurface = NULL;
//cout << "Free'd surface \n";
}
if (textTexture == NULL){
//cout << "Could not free memory for text \"" << text << "\". Error from SDL is: " << TTF_GetError() << endl;
}
else{
SDL_DestroyTexture(textTexture);
textTexture = NULL;
}
if (numOfInstances == 1){
for (int i=0; i <= (highestFontSize-lowestFontSize); i++){
TTF_CloseFont(fonts[i]);
//cout << "Closed " << lowestFontSize+i << endl;
}
try{
TTF_Quit();
//cout << "Quit ttf" << endl;
}
catch (exception &err){
cout << "Could not quit ttf for text \"" << text << "\". Error from SDL is: " << TTF_GetError() << ". Error from C++ is: " << err.what() << endl;
}
}
///For TTF_Init();
numOfInstances -= 1;
//cout << "Free'd " << text << endl;
}
else{
//cout << "Text not setup yet when trying to free!" << endl;
}
setup = false;
}
void Test::Setup(SDL_Renderer *renderer)
{
if (setup == false){
setup = true;
testText.Setup(renderer,"",300,200,30);
}
}
void Test::Tester(SDL_Renderer *renderer)
{
Setup(renderer);
if (EVENTS.currentKey != ""){
testText.Change_Text(renderer,testText.Get_Text() + EVENTS.currentKey);
}
if (EVENTS.pasteText == true){
testText.Change_Text(renderer,testText.Get_Text() + SDL_GetClipboardText());
}
if (EVENTS.backspacepressed == true){
if (testText.Get_Text() != "") {
string tempText = (testText.Get_Text());
tempText.pop_back();
testText.Change_Text(renderer,tempText);
}
}
testText.Draw_Text(renderer);
}
版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 dio@foxmail.com 举报，一经查实，本站将立刻删除。