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Merge pull request #503 from TomHarte/SDLScreenshots

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Adds screenshot saving upon ctrl+shift+d.
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Thomas Harte 2018-07-26 20:58:35 -04:00 committed by GitHub
commit 080aa0acc5
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1 changed files with 40 additions and 0 deletions
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OSBindings/SDL/main.cpp
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@ -11,6 +11,7 @@
#include <cstring>
#include <iostream>
#include <memory>
#include <sys/stat.h>
#include <SDL2/SDL.h>
@ -598,6 +599,45 @@ int main(int argc, char *argv[]) {
}
}
// Capture ctrl+shift+d as a take-a-screenshot command.
if(event.key.keysym.sym == SDLK_d && (SDL_GetModState()&KMOD_CTRL) && (SDL_GetModState()&KMOD_SHIFT)) {
// Pick a width to capture that will preserve a 4:3 output aspect ratio.
const int proportional_width = (window_height * 4) / 3;
// Grab the screen buffer.
std::vector<uint8_t> pixels(proportional_width * window_height * 4);
glReadPixels((window_width - proportional_width) >> 1, 0, proportional_width, window_height, GL_RGBA, GL_UNSIGNED_BYTE, pixels.data());
// Flip the buffer vertically, because SDL and OpenGL do not agree about
// the basis axes.
std::vector<uint8_t> swap_buffer(proportional_width*4);
for(int y = 0; y < window_height >> 1; ++y) {
memcpy(swap_buffer.data(), &pixels[y*proportional_width*4], swap_buffer.size());
memcpy(&pixels[y*proportional_width*4], &pixels[(window_height - 1 - y)*proportional_width*4], swap_buffer.size());
memcpy(&pixels[(window_height - 1 - y)*proportional_width*4], swap_buffer.data(), swap_buffer.size());
}
// Find the first available name of the form ~/clk-screenshot-<number>.bmp.
size_t index = 0;
const std::string home = getenv("HOME");
std::string target;
while(true) {
target = home + "/clk-screenshot-" + std::to_string(index) + ".bmp";
struct stat file_stats;
if(stat(target.c_str(), &file_stats))
break;
++index;
}
// Create a suitable SDL surface and save the thing.
SDL_Surface *const surface = SDL_CreateRGBSurfaceFrom(pixels.data(), proportional_width, window_height, 8*4, proportional_width*4, 0, 0, 0, 0);
SDL_SaveBMP(surface, target.c_str());
SDL_FreeSurface(surface);
break;
}
// deliberate fallthrough...
case SDL_KEYUP: {