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danny_dot_net
Joined: 11 Jul 2008
Posts: 4
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 Posted: Tue Jul 15, 2008 1:41 pm Post subject: psp crash when I try to resize image with SDL |
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the program is simply for loading a jpg file each time and displaying it.
there are altogether 3 jpg files, the sizes of the first two are all 512*340.
When I load, resize and display the first image, it goes fine. but when it comes to the second image, the psp get crashed, but it goes well on pc. I use "zoomSurface" from SDL_rotozoom to resize image. If image is not resized, just simply loading and displaying, the program runs fine in both pc and psp.
the main function is void DrawPic(int id), possible error are hiding there.
| Code: | #pragma warning(disable : 4786)
#ifdef WIN32
#else
#include <pspkernel.h>
#endif
#include <stdio.h>
#include <malloc.h>
#include <sdl.h>
#include <sdl_image.h>
#include <sdl_ttf.h>
#include "sdl_rotozoom.h"
#define SCREEN_WIDTH 480
#define SCREEN_HEIGHT 272
#ifdef WIN32
#else
PSP_HEAP_SIZE_KB(20480);
#endif
SDL_Surface *Screen;
SDL_Surface *Image;
SDL_Surface *Message;
TTF_Font *Font;
int freemem()
{
void *ptrs[480];
int mem, x, i;
for (x = 0; x < 480; x++)
{
void *ptr = malloc(51200);
if (!ptr) break;
ptrs[x] = ptr;
}
mem = x * 51200;
for (i = 0; i < x; i++)
free(ptrs[i]);
return mem;
}
void Write(char *content,int x, int y)
{
SDL_Color fontcolor={0,255,0};
SDL_Rect coord={x,y,0,0};
Message=TTF_RenderText_Solid(Font,content,fontcolor);
SDL_BlitSurface(Message,NULL,Screen,&coord);
SDL_FreeSurface(Message);
SDL_Flip( Screen );
}
void DrawPic(int id)
{
char filename[30];
char string[30];
double ratio,ratio1,ratio2;
SDL_RWops *rwop;
SDL_Surface *resizedImage;
if(Image!=NULL)
{
SDL_FreeSurface(Image);
}
//load a image
sprintf(filename,"gamebg%d.jpg",id);
rwop=SDL_RWFromFile(filename,"rb");
Image=IMG_LoadJPG_RW(rwop);
if(Image==NULL)
{
sprintf(string,"Err: Image load error!\n");
Write(string,10,30);
return;
}
rwop->close(rwop);
SDL_FreeRW(rwop);
//-----------------------------------------------
//-----------Error part starts here--------------
//-----------------------------------------------
//zoom the image
ratio1=(double)SCREEN_WIDTH/Image->w;
ratio2=(double)SCREEN_HEIGHT/Image->h;
if(ratio1<ratio2)
ratio=ratio1;
else
ratio=ratio2;
resizedImage=zoomSurface(Image,ratio,ratio,0);
if(resizedImage==NULL)
{
sprintf(string,"Image resize error!\n");
Write(string,10,30);
return;
}
if(Image!=NULL)SDL_FreeSurface(Image);
Image=resizedImage;
//---------------------------------------------
//-----------Error part ends here--------------
//---------------------------------------------
//draw black background
SDL_FillRect(Screen,NULL,SDL_MapRGB(Screen->format,0,0,0));
//draw the image
SDL_BlitSurface(Image, NULL, Screen, NULL);
//update screen
SDL_Flip( Screen );
//Show pic id
sprintf(string,"PicID: %d",id);
Write(string,10,10);
sprintf(string,"Available Mem: %.2fM",freemem()*1.0/(1024*1024));
Write(string,200,10);
}
extern "C"
int main(int argc, char* argv[])
{
//Initialize SDL and other sub-systems
SDL_Init(SDL_INIT_VIDEO);
Screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, 32, SDL_SWSURFACE|SDL_ANYFORMAT);
SDL_ShowCursor(SDL_DISABLE);
TTF_Init();
Font=TTF_OpenFont("times.ttf",12);
//first image show
DrawPic(1);
SDL_Delay(2000);
DrawPic(2);
SDL_Delay(2000);
DrawPic(3);
SDL_Delay(2000);
//end program
SDL_Quit();
return 0;
} |
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Jim
Joined: 02 Jul 2005
Posts: 487
Location: Sydney
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danny_dot_net
Joined: 11 Jul 2008
Posts: 4
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| Posted: Wed Jul 16, 2008 5:20 pm Post subject: |
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Now I find what makes the program get crashed in PSP, the bug is that
| Code: |
resizedImage=zoomSurface(Image,ratio,ratio,0);
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can not exist at the same time with the following code
| Code: |
sprintf(string,"PicID: %d",id);
Write(string,10,10);
sprintf(string,"Available Mem: %.2fM",freemem()*1.0/(1024*1024));
Write(string,200,10);
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If one of them is deleted from the code, the whole program runs wll in PSP, but it does not happen when both of them are there. |
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Jim
Joined: 02 Jul 2005
Posts: 487
Location: Sydney
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| Posted: Thu Jul 17, 2008 8:03 am Post subject: |
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What if you just take out the freemem() call from the sprintf? Does it still work then? If so, the heap has got corrupted. But from the size of your images you're going to run out of memory too, hence my first suggestion.
Jim
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danny_dot_net
Joined: 11 Jul 2008
Posts: 4
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| Posted: Fri Jul 18, 2008 1:56 pm Post subject: |
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| Jim wrote: | What if you just take out the freemem() call from the sprintf? Does it still work then? If so, the heap has got corrupted. But from the size of your images you're going to run out of memory too, hence my first suggestion.
Jim |
as you can see freemem() just checks the residual memory size but does not possese any memory after calling it. anyway, I will give a shot. |
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Jim
Joined: 02 Jul 2005
Posts: 487
Location: Sydney
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| Posted: Sat Jul 19, 2008 10:49 am Post subject: |
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I know, but if the heap were corrupted (eg. by some function allocating too little space then overwriting the end of the allocation), then using the heap next time (like freemem does) will likely trigger a crash caused by corrupting heap earlier on.
If taking out the freemem call moves the error back into the next zoomSurface then either you are running out of ram entirely, or zoomSurface is corrupting the heap.
Jim
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Smong
Joined: 04 Sep 2007
Posts: 82
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| Posted: Sat Jul 19, 2008 9:37 pm Post subject: |
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This probably isn't related to the error you are expeiencing, but you don't need to be calling SDL_Flip() so often. Try taking it out of Write() and DrawPic(), then call it after DrawPic like this:
| Code: |
//first image show
DrawPic(1);
SDL_Flip(Screen);
SDL_Delay(2000);
DrawPic(2);
SDL_Flip(Screen);
SDL_Delay(2000);
DrawPic(3);
SDL_Flip(Screen);
SDL_Delay(2000);
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Jim
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