Saturday, December 8, 2012
Applying transparency using win32 api, C++/SDL code
Well , lets use the win32 api - SetLayeredWindowAttributes()
#define _WIN32_WINNT 0x0500
#define WINVER 0x0500
#include <windows.h>
#include <SDL/SDL.h>
#include <SDL/SDL_syswm.h>
#include <SDL/SDL_ttf.h>
#include <SDL/SDL_image.h>
#include <iostream>
#include <string>
#include <sstream>
using namespace std;
SDL_Surface *loadimg(string filename);
int main(int argc, char* argv[])
{
SDL_Init(SDL_INIT_EVERYTHING);
TTF_Init();
TTF_Font *font = TTF_OpenFont("fonts/AlphaMaleModern.ttf", 40);
SDL_Surface *screen, *text, *img;
screen = SDL_SetVideoMode(400, 300, 32, SDL_SWSURFACE);
img = loadimg("images/op.png");
SDL_SetAlpha(img, SDL_SRCALPHA, 129);
bool running = true;
SDL_Event events;
Uint32 start;
HWND hwnd;
//transparency starts here
SDL_SysWMinfo info;
SDL_VERSION(&info.version);
if(SDL_GetWMInfo(&info))
{
hwnd = info.window;
}
SetWindowLong(hwnd, GWL_EXSTYLE, GetWindowLong(hwnd, GWL_EXSTYLE) |WS_EX_LAYERED);
SetLayeredWindowAttributes(hwnd, RGB(0,0,0), (255 * 70)/100, LWA_COLORKEY);
Uint32 color = SDL_MapRGB(screen->format, 0x00, 0x00, 0x00);
SDL_Color color2 = {0xff, 0xff, 0xff};
stringstream ss;
SDL_Rect box;
box.x = 150;
box.y = 130;
SDL_Rect imgbox;
imgbox.h = 100;
imgbox.w = 200;
imgbox.x = 100;
imgbox.y = 100;
while(running)
{
start = SDL_GetTicks();
while(SDL_PollEvent(&events))
{
switch(events.type)
{
case SDL_QUIT:
running = false;
break;
}
}
ss.str(" ");
ss << "hello";
text = TTF_RenderText_Solid(font, ss.str().c_str(), color2);
SDL_FillRect(screen, &screen->clip_rect, color);
SDL_BlitSurface(img, NULL, screen, &imgbox);
//SDL_BlitSurface(text, NULL, screen, &box);
SDL_Flip(screen);
//frame regulation
if(1000/30 > SDL_GetTicks() - start)
SDL_Delay(1000/30 - (SDL_GetTicks() - start));
}
SDL_FreeSurface(text);
TTF_Quit();
SDL_Quit();
return 0;
}
SDL_Surface *loadimg(string filename)
{
SDL_Surface *tmp = NULL;
SDL_Surface *opt = NULL;
tmp = IMG_Load(filename.c_str());
if(tmp != NULL)
{
SDL_SetAlpha(tmp, SDL_SRCALPHA, 129);
opt = SDL_DisplayFormat(tmp);
SDL_FreeSurface(tmp);
}
return opt;
}
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Wanted to create transparent windows and it works with your method :)
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