Crash drawing tilemaps

[dacap]

We have receive a couple of similar crashes:

https://igarastudio.zendesk.com/agent/tickets/2489
https://igarastudio.zendesk.com/agent/tickets/2517
https://igarastudio.zendesk.com/agent/tickets/2588
https://igarastudio.zendesk.com/agent/tickets/2600

From the information given from the user in ticket 2600, we can now reproduce the issue: tile manual mode, change to a regular layer, with the preview window visible, it crashes in this place with cel_layer is not a tilemap but the cel_image is a IMAGE_TILEMAP.

    if (area.size.w < 1 ||
        area.size.h < 1)
      return;

    auto tilemapLayer = static_cast<const LayerTilemap*>(cel_layer);
    doc::Grid grid = tilemapLayer->tileset()->grid(); // 0xC0000005: Access violation reading location 0xFFFFFFFFFFFFFFFF.
    grid.origin(grid.origin() + gfx::Point(celBounds.origin()));

    // Is the 'm_previewTileset' set to be used with this layer?
    const Tileset* tileset;
    if (m_previewTileset && cel &&
        checkIfWeShouldUsePreview(cel)) {
      tileset = m_previewTileset;
    }

>	Aseprite.exe!render::Render::renderCel(doc::Image * dst_image, const doc::Cel * cel, const doc::Image * cel_image, const doc::Layer * cel_layer, const doc::Palette * pal, const gfx::RectT<double> & celBounds, const gfx::ClipT<int> & area, void(*)(doc::Image *, const doc::Image *, const doc::Palette *, const gfx::ClipT<double> &, const int, const doc::BlendMode, const double, const double, const bool) compositeImage, const int opacity, const doc::BlendMode blendMode) Line 1246	C++
 	Aseprite.exe!render::Render::renderCel(doc::Image * dst_image, const doc::Cel * cel, const doc::Sprite * sprite, const doc::Image * cel_image, const doc::Layer * cel_layer, const doc::Palette * pal, const gfx::RectT<double> & celBounds, const gfx::ClipT<int> & area, const int opacity, const doc::BlendMode blendMode) Line 1216	C++
 	Aseprite.exe!render::Render::renderLayer(const doc::Layer * layer, doc::Image * image, const gfx::ClipT<int> & area, const int frame, void(*)(doc::Image *, const doc::Image *, const doc::Palette *, const gfx::ClipT<double> &, const int, const doc::BlendMode, const double, const double, const bool) compositeImage, const bool render_background, const bool render_transparent, const doc::BlendMode blendMode, bool isSelected) Line 1182	C++
 	Aseprite.exe!render::Render::renderLayer(const doc::Layer * layer, doc::Image * image, const gfx::ClipT<int> & area, const int frame, void(*)(doc::Image *, const doc::Image *, const doc::Palette *, const gfx::ClipT<double> &, const int, const doc::BlendMode, const double, const double, const bool) compositeImage, const bool render_background, const bool render_transparent, const doc::BlendMode blendMode, bool isSelected) Line 1149	C++
 	Aseprite.exe!render::Render::renderSpriteLayers(doc::Image * dstImage, const gfx::ClipT<double> & area, int frame, void(*)(doc::Image *, const doc::Image *, const doc::Palette *, const gfx::ClipT<double> &, const int, const doc::BlendMode, const double, const double, const bool) compositeImage) Line 808	C++
 	Aseprite.exe!render::Render::renderSprite(doc::Image * dstImage, const doc::Sprite * sprite, int frame, const gfx::ClipT<double> & area) Line 740	C++
 	Aseprite.exe!app::Editor::drawOneSpriteUnclippedRect(ui::Graphics * g, const gfx::RectT<int> & spriteRectToDraw, int dx, int dy) Line 701	C++
 	Aseprite.exe!app::Editor::drawSpriteUnclippedRect(ui::Graphics * g, const gfx::RectT<int> & _rc) Line 857	C++
 	Aseprite.exe!app::Editor::onPaint(ui::PaintEvent & ev) Line 2140	C++
 	Aseprite.exe!ui::Widget::paintEvent(ui::Graphics * graphics, const bool isBg) Line 1140	C++
 	Aseprite.exe!ui::Widget::onProcessMessage(ui::Message * msg) Line 1481	C++
 	Aseprite.exe!app::Editor::onProcessMessage(ui::Message * msg) Line 2034	C++
 	Aseprite.exe!ui::Manager::sendMessageToWidget(ui::Message * msg, ui::Widget * widget) Line 1867	C++
 	Aseprite.exe!ui::Manager::pumpQueue() Line 1758	C++
 	Aseprite.exe!ui::Manager::dispatchMessages() Line 830	C++
 	Aseprite.exe!ui::Manager::run() Line 267	C++
 	Aseprite.exe!app::App::run() Line 424	C++
 	Aseprite.exe!app_main(int argc, char * * argv) Line 105	C++
 	Aseprite.exe!wWinMain(HINSTANCE__ * hInstance, HINSTANCE__ * hPrevInstance, wchar_t * lpCmdLine, int nCmdShow) Line 41	C++

[dacap]

This will be fixed in v1.3-beta6