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Handle MONITOR_ZOOM for screen transitions and captures

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Something must have changed, but now the MONITOR_ZOOM factor must be
considered when calling `SDL_RenderReadPixels`. Always calling with a
monitor width and height of 240 results in a segmentation fault in said
function.

Fixes: https://github.com/InfiniTimeOrg/InfiniSim/issues/95
This commit is contained in:
Reinhold Gschweicher 2023-05-03 22:28:17 +02:00
parent e9a42c8638
commit 8753661845
2 changed files with 15 additions and 12 deletions
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18
main.cpp
View File

@ -141,16 +141,17 @@ void saveScreenshot()
for (int i = 0; i < height; i++) {
row_pointers[i] = (png_bytep)png_malloc(png_ptr, width*4);
}
constexpr size_t zoom = MONITOR_ZOOM;
const Uint32 format = SDL_PIXELFORMAT_RGBA8888;
SDL_Surface *surface = SDL_CreateRGBSurfaceWithFormat(0, width, height, 32, format);
SDL_Surface *surface = SDL_CreateRGBSurfaceWithFormat(0, width*zoom, height*zoom, 32, format);
SDL_RenderReadPixels(renderer, NULL, format, surface->pixels, surface->pitch);
png_bytep pixels = (png_bytep)surface->pixels;
for (int hi = 0; hi < height; hi++) {
for (int wi = 0; wi < width; wi++) {
int c = wi * 4;
row_pointers.at(hi)[wi*4+0] = pixels[hi*surface->pitch + wi*4 + 3]; // red
row_pointers.at(hi)[wi*4+1] = pixels[hi*surface->pitch + wi*4 + 2]; // greeen
row_pointers.at(hi)[wi*4+2] = pixels[hi*surface->pitch + wi*4 + 1]; // blue
row_pointers.at(hi)[wi*4+0] = pixels[hi*surface->pitch*zoom + wi*4*zoom + 3]; // red
row_pointers.at(hi)[wi*4+1] = pixels[hi*surface->pitch*zoom + wi*4*zoom + 2]; // greeen
row_pointers.at(hi)[wi*4+2] = pixels[hi*surface->pitch*zoom + wi*4*zoom + 1]; // blue
row_pointers.at(hi)[wi*4+3] = 255; // alpha
}
}
@ -223,17 +224,18 @@ public:
{
last_frame = std::chrono::system_clock::now();
auto renderer = monitor.renderer;
constexpr size_t zoom = MONITOR_ZOOM;
const Uint32 format = SDL_PIXELFORMAT_RGBA8888;
SDL_Surface *surface = SDL_CreateRGBSurfaceWithFormat(0, sdl_width, sdl_height, 32, format);
SDL_Surface *surface = SDL_CreateRGBSurfaceWithFormat(0, sdl_width*zoom, sdl_height*zoom, 32, format);
SDL_RenderReadPixels(renderer, NULL, format, surface->pixels, surface->pitch);
uint8_t *pixels = (uint8_t*) surface->pixels;
std::array<uint8_t, 240*240*4> image;
for (int hi = 0; hi < sdl_height; hi++) {
for (int wi = 0; wi < sdl_width; wi++) {
auto red = pixels[hi*surface->pitch + wi*4 + 3]; // red
auto green = pixels[hi*surface->pitch + wi*4 + 2]; // green
auto blue = pixels[hi*surface->pitch + wi*4 + 1]; // blue
auto red = pixels[hi*surface->pitch*zoom + wi*4*zoom + 3]; // red
auto green = pixels[hi*surface->pitch*zoom + wi*4*zoom + 2]; // green
auto blue = pixels[hi*surface->pitch*zoom + wi*4*zoom + 1]; // blue
image[(hi * sdl_width + wi)*4 + 0] = red;
image[(hi * sdl_width + wi)*4 + 1] = green;
image[(hi * sdl_width + wi)*4 + 2] = blue;

9
sim/displayapp/LittleVgl.cpp
View File

@ -194,17 +194,18 @@ void MoveScreen(lv_disp_drv_t *disp_drv, int16_t height) {
const int sdl_height = 240;
auto renderer = monitor.renderer;
constexpr size_t zoom = MONITOR_ZOOM;
const Uint32 format = SDL_PIXELFORMAT_RGBA8888;
SDL_Surface *surface = SDL_CreateRGBSurfaceWithFormat(0, sdl_width, sdl_height, 32, format);
SDL_Surface *surface = SDL_CreateRGBSurfaceWithFormat(0, sdl_width*zoom, sdl_height*zoom, 32, format);
SDL_RenderReadPixels(renderer, NULL, format, surface->pixels, surface->pitch);
uint8_t *pixels = (uint8_t*) surface->pixels;
std::array<lv_color16_t, 240*240> color_p;
for (int hi = 0; hi < sdl_height; hi++) {
for (int wi = 0; wi < sdl_width; wi++) {
auto red = pixels[hi*surface->pitch + wi*4 + 3]; // red
auto green = pixels[hi*surface->pitch + wi*4 + 2]; // greeen
auto blue = pixels[hi*surface->pitch + wi*4 + 1]; // blue
auto red = pixels[hi*surface->pitch*zoom + wi*4*zoom + 3]; // red
auto green = pixels[hi*surface->pitch*zoom + wi*4*zoom + 2]; // greeen
auto blue = pixels[hi*surface->pitch*zoom + wi*4*zoom + 1]; // blue
color_p.at(hi * sdl_width + wi) = LV_COLOR_MAKE(red, green, blue);
}
}