ImDuino

ImGui on Arduino example

This is a fork for do some personal tests and for code changes backup, use at your own risk

Softraster changed to render by line

Motivation

My ESP32 can not allocate all the memory needed to render a 320x240 colored TFT screen, rendering by line allows using a smaller buffer size because every line it is sent to the screen and the buffer reused for the next line

The code on softraster/softraster/softraster.h is rendering by Y axis and after the line is rendered it will call the callback function (texture_t<COLOR>::lineWritedCb) or copy to the original buffer (for some testing purposes)

Draw line on the TFT screen callback

/*
 * @brief Draws one line
 */
void drawLineCallback(texture_color16_t &screen, int y, color16_t *Line) {
    for (int16_t i = 0; i < screen.w; i++) {
        tft.writePixel(i, y, ((const unsigned uint16_t *)Line)[i]);
    }
}

Screen init changed

    /*
     * @brief callback for draw one line
     */
    screen.lineWritedCb = drawLineCallback;

    screen.init(SCREENX, SCREENY, nullptr); // Sets the raster buffer as nullptr

Screen draw was modified to:

void screen_draw() {
    tft.startWrite();
    ImGui_ImplSoftraster_RenderDrawData(ImGui::GetDrawData());
    tft.endWrite();
}