test/testshape.c
author Sam Lantinga <slouken@libsdl.org>
Sun, 07 Jul 2019 09:10:56 -0700
changeset 12928 3c4a4b1077cd
parent 12503 806492103856
permissions -rw-r--r--
Fixed bug 4710 - audio/alsa: avoid configuring hardware parameters with only a single period

Anthony Pesch

The previous code first configured the period size using snd_pcm_hw_par-
ams_set_period_size_near. Then, it further narrowed the configuration
space by calling snd_pcm_hw_params_set_buffer_size_near using a buffer
size of 2 times the _requested_ period size in order to try and get a
configuration with only 2 periods. If the configured period size was
larger than the requested size, the second call could inadvertently
narrow the configuration space to contain only a single period.

Rather than fixing the call to snd_pcm_hw_params_set_buffer_size_near
to use a size of 2 times the configured period size, the code has been
changed to use snd_pcm_hw_params_set_periods_min in order to more
clearly explain the intent.
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/*
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  Copyright (C) 1997-2019 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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*/
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#include <stdlib.h>
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#include <math.h>
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#include <stdio.h>
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#include "SDL.h"
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#include "SDL_shape.h"
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#define SHAPED_WINDOW_X 150
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#define SHAPED_WINDOW_Y 150
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#define SHAPED_WINDOW_DIMENSION 640
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typedef struct LoadedPicture {
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    SDL_Surface *surface;
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    SDL_Texture *texture;
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    SDL_WindowShapeMode mode;
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    const char* name;
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} LoadedPicture;
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void render(SDL_Renderer *renderer,SDL_Texture *texture,SDL_Rect texture_dimensions)
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{
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    /* Clear render-target to blue. */
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    SDL_SetRenderDrawColor(renderer,0x00,0x00,0xff,0xff);
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    SDL_RenderClear(renderer);
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    /* Render the texture. */
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    SDL_RenderCopy(renderer,texture,&texture_dimensions,&texture_dimensions);
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    SDL_RenderPresent(renderer);
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}
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int main(int argc,char** argv)
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{
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    Uint8 num_pictures;
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    LoadedPicture* pictures;
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    int i, j;
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    SDL_PixelFormat* format = NULL;
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    SDL_Window *window;
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    SDL_Renderer *renderer;
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    SDL_Color black = {0,0,0,0xff};
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    SDL_Event event;
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    int should_exit = 0;
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    unsigned int current_picture;
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    int button_down;
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    Uint32 pixelFormat = 0;
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    int access = 0;
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    SDL_Rect texture_dimensions;
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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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    if(argc < 2) {
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        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL_Shape requires at least one bitmap file as argument.");
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        exit(-1);
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    }
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    if(SDL_VideoInit(NULL) == -1) {
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        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not initialize SDL video.");
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        exit(-2);
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    }
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    num_pictures = argc - 1;
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    pictures = (LoadedPicture *)SDL_malloc(sizeof(LoadedPicture)*num_pictures);
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    if (!pictures) {
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        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not allocate memory.");
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        exit(1);
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    }
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    for(i=0;i<num_pictures;i++)
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        pictures[i].surface = NULL;
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    for(i=0;i<num_pictures;i++) {
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        pictures[i].surface = SDL_LoadBMP(argv[i+1]);
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        pictures[i].name = argv[i+1];
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        if(pictures[i].surface == NULL) {
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            for(j=0;j<num_pictures;j++)
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                SDL_FreeSurface(pictures[j].surface);
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            SDL_free(pictures);
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            SDL_VideoQuit();
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            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not load surface from named bitmap file: %s", argv[i+1]);
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            exit(-3);
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        }
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        format = pictures[i].surface->format;
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        if(SDL_ISPIXELFORMAT_ALPHA(format->format)) {
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            pictures[i].mode.mode = ShapeModeBinarizeAlpha;
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            pictures[i].mode.parameters.binarizationCutoff = 255;
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        }
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        else {
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            pictures[i].mode.mode = ShapeModeColorKey;
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            pictures[i].mode.parameters.colorKey = black;
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        }
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    }
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    window = SDL_CreateShapedWindow("SDL_Shape test",
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        SHAPED_WINDOW_X, SHAPED_WINDOW_Y,
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        SHAPED_WINDOW_DIMENSION,SHAPED_WINDOW_DIMENSION,
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        0);
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    SDL_SetWindowPosition(window, SHAPED_WINDOW_X, SHAPED_WINDOW_Y);
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    if(window == NULL) {
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        for(i=0;i<num_pictures;i++)
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            SDL_FreeSurface(pictures[i].surface);
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        SDL_free(pictures);
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        SDL_VideoQuit();
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        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not create shaped window for SDL_Shape.");
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        exit(-4);
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    }
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    renderer = SDL_CreateRenderer(window,-1,0);
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    if (!renderer) {
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        SDL_DestroyWindow(window);
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        for(i=0;i<num_pictures;i++)
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            SDL_FreeSurface(pictures[i].surface);
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        SDL_free(pictures);
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        SDL_VideoQuit();
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        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not create rendering context for SDL_Shape window.");
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        exit(-5);
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    }
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    for(i=0;i<num_pictures;i++)
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        pictures[i].texture = NULL;
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    for(i=0;i<num_pictures;i++) {
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        pictures[i].texture = SDL_CreateTextureFromSurface(renderer,pictures[i].surface);
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        if(pictures[i].texture == NULL) {
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            for(i=0;i<num_pictures;i++)
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                if(pictures[i].texture != NULL)
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                    SDL_DestroyTexture(pictures[i].texture);
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            for(i=0;i<num_pictures;i++)
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                SDL_FreeSurface(pictures[i].surface);
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            SDL_free(pictures);
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            SDL_DestroyRenderer(renderer);
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            SDL_DestroyWindow(window);
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            SDL_VideoQuit();
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            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not create texture for SDL_shape.");
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            exit(-6);
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        }
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    }
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    should_exit = 0;
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    current_picture = 0;
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    button_down = 0;
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    texture_dimensions.h = 0;
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    texture_dimensions.w = 0;
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    texture_dimensions.x = 0;
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    texture_dimensions.y = 0;
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    SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION, "Changing to shaped bmp: %s", pictures[current_picture].name);
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    SDL_QueryTexture(pictures[current_picture].texture,(Uint32 *)&pixelFormat,(int *)&access,&texture_dimensions.w,&texture_dimensions.h);
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    SDL_SetWindowSize(window,texture_dimensions.w,texture_dimensions.h);
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    SDL_SetWindowShape(window,pictures[current_picture].surface,&pictures[current_picture].mode);
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    while(should_exit == 0) {
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        while (SDL_PollEvent(&event)) {
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            if(event.type == SDL_KEYDOWN) {
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                button_down = 1;
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                if(event.key.keysym.sym == SDLK_ESCAPE) {
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                    should_exit = 1;
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                    break;
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                }
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            }
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            if(button_down && event.type == SDL_KEYUP) {
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                button_down = 0;
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                current_picture += 1;
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                if(current_picture >= num_pictures)
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                    current_picture = 0;
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                SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION, "Changing to shaped bmp: %s", pictures[current_picture].name);
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                SDL_QueryTexture(pictures[current_picture].texture,(Uint32 *)&pixelFormat,(int *)&access,&texture_dimensions.w,&texture_dimensions.h);
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                SDL_SetWindowSize(window,texture_dimensions.w,texture_dimensions.h);
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                SDL_SetWindowShape(window,pictures[current_picture].surface,&pictures[current_picture].mode);
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            }
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            if (event.type == SDL_QUIT) {
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                should_exit = 1;
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                break;
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            }
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        }
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        render(renderer,pictures[current_picture].texture,texture_dimensions);
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        SDL_Delay(10);
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    }
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    /* Free the textures. */
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    for(i=0;i<num_pictures;i++)
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        SDL_DestroyTexture(pictures[i].texture);
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    SDL_DestroyRenderer(renderer);
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    /* Destroy the window. */
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    SDL_DestroyWindow(window);
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    /* Free the original surfaces backing the textures. */
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    for(i=0;i<num_pictures;i++)
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        SDL_FreeSurface(pictures[i].surface);
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    SDL_free(pictures);
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    /* Call SDL_VideoQuit() before quitting. */
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    SDL_VideoQuit();
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    return 0;
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}
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