Function getImagesMaxExtent

src/OpenLoco/src/Graphics/Gfx.cpp:391–491

0x004530F8

    // 0x004530F8
    ImageExtents getImagesMaxExtent(const ImageId baseImageId, const size_t numImages)
    {
        uint8_t bitmap[200][200] = {};

        RenderTarget rt = {
            /*.bits = */ reinterpret_cast<uint8_t*>(bitmap),
            /*.x = */ -100,
            /*.y = */ -100,
            /*.width = */ 200,
            /*.height = */ 200,
            /*.pitch = */ 0,
            /*.zoom_level = */ 0,
        };

        auto& drawingCtx = Gfx::getDrawingEngine().getDrawingContext();
        drawingCtx.pushRenderTarget(rt);

        // Draw all the images on top of the one bitmap
        for (size_t i = 0; i < numImages; ++i)
        {
            drawingCtx.drawImage({ 0, 0 }, baseImageId.withIndexOffset(static_cast<int32_t>(i)));
        }

        drawingCtx.popRenderTarget();

        // Explore the bitmap to find the extents of the images drawn
        int32_t spriteWidth = -1;
        for (int32_t i = 99; i != 0; --i)
        {
            for (int32_t j = 0; j < 200; j++)
            {
                if (bitmap[j][100 - i] != 0)
                {
                    spriteWidth = i;
                    break;
                }
            }

            if (spriteWidth != -1)
            {
                break;
            }

            for (int32_t j = 0; j < 200; j++)
            {
                if (bitmap[j][100 + i] != 0)
                {
                    spriteWidth = i;
                    break;
                }
            }

            if (spriteWidth != -1)
            {
                break;
            }
        }