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https://github.com/Relintai/sdl2_frt.git
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93a520b385
Sylvain
This still happens with the current trunk version. (software renderer of testdrawchessboard.c)
When there is a rotation, the window size changed and the internal surface is marked as "surface_valid == SDL_FALSE".
And all further call fails.
SDL_video.c :
2478 void
2479 SDL_OnWindowResized(SDL_Window * window)
2480 {
2481 window->surface_valid = SDL_FALSE;
2482 SDL_SendWindowEvent(window, SDL_WINDOWEVENT_SIZE_CHANGED, window->w, window->h);
2483 }
some error set to :
2233 return SDL_SetError("Window surface is invalid, please call SDL_GetWindowSurface() to get a new surface");
So, this seems to be the behavior of the API ...
In the loop() function of testdrawchessboard.c, we can recreate the surface/renderer :
65 if (e.type == SDL_WINDOWEVENT)
66 {
67 if (e.window.event == SDL_WINDOWEVENT_SIZE_CHANGED)
68 {
69 surface = SDL_GetWindowSurface(window);
70 renderer = SDL_CreateSoftwareRenderer(surface);
71 }
72 /* Clear the rendering surface with the specified color */
73 SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);
74 SDL_RenderClear(renderer);
75 }
And it displays correctly.
148 lines
3.7 KiB
C
148 lines
3.7 KiB
C
/*
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Copyright (C) 1997-2017 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely.
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This file is created by : Nitin Jain (nitin.j4@samsung.com)
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*/
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/* Sample program: Draw a Chess Board by using SDL_CreateSoftwareRenderer API */
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#include <stdlib.h>
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#include <stdio.h>
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#ifdef __EMSCRIPTEN__
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#include <emscripten/emscripten.h>
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#endif
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#include "SDL.h"
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SDL_Window *window;
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SDL_Renderer *renderer;
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SDL_Surface *surface;
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int done;
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void
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DrawChessBoard(SDL_Renderer * renderer)
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{
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int row = 0,column = 0,x = 0;
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SDL_Rect rect, darea;
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/* Get the Size of drawing surface */
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SDL_RenderGetViewport(renderer, &darea);
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for( ; row < 8; row++)
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{
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column = row%2;
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x = column;
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for( ; column < 4+(row%2); column++)
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{
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SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0xFF);
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rect.w = darea.w/8;
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rect.h = darea.h/8;
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rect.x = x * rect.w;
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rect.y = row * rect.h;
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x = x + 2;
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SDL_RenderFillRect(renderer, &rect);
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}
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}
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}
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void
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loop()
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{
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SDL_Event e;
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while (SDL_PollEvent(&e)) {
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/* Re-create when window has been resized */
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if ((e.type == SDL_WINDOWEVENT) && (e.window.event == SDL_WINDOWEVENT_SIZE_CHANGED)) {
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SDL_DestroyRenderer(renderer);
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surface = SDL_GetWindowSurface(window);
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renderer = SDL_CreateSoftwareRenderer(surface);
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/* Clear the rendering surface with the specified color */
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SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);
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SDL_RenderClear(renderer);
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}
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if (e.type == SDL_QUIT) {
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done = 1;
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#ifdef __EMSCRIPTEN__
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emscripten_cancel_main_loop();
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#endif
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return;
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}
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if ((e.type == SDL_KEYDOWN) && (e.key.keysym.sym == SDLK_ESCAPE)) {
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done = 1;
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#ifdef __EMSCRIPTEN__
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emscripten_cancel_main_loop();
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#endif
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return;
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}
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}
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DrawChessBoard(renderer);
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/* Got everything on rendering surface,
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now Update the drawing image on window screen */
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SDL_UpdateWindowSurface(window);
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}
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int
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main(int argc, char *argv[])
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{
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/* Enable standard application logging */
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SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
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/* Initialize SDL */
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if(SDL_Init(SDL_INIT_VIDEO) != 0)
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{
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL_Init fail : %s\n", SDL_GetError());
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return 1;
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}
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/* Create window and renderer for given surface */
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window = SDL_CreateWindow("Chess Board", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, SDL_WINDOW_RESIZABLE);
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if(!window)
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{
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Window creation fail : %s\n",SDL_GetError());
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return 1;
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}
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surface = SDL_GetWindowSurface(window);
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renderer = SDL_CreateSoftwareRenderer(surface);
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if(!renderer)
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{
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Render creation for surface fail : %s\n",SDL_GetError());
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return 1;
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}
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/* Clear the rendering surface with the specified color */
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SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);
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SDL_RenderClear(renderer);
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/* Draw the Image on rendering surface */
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done = 0;
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#ifdef __EMSCRIPTEN__
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emscripten_set_main_loop(loop, 0, 1);
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#else
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while (!done) {
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loop();
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}
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#endif
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SDL_Quit();
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return 0;
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}
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