diff --git a/Makefile.base.mk b/Makefile.base.mk
index 83d64e65..59433f83 100644
--- a/Makefile.base.mk
+++ b/Makefile.base.mk
@@ -197,7 +197,7 @@ endif
 
 ifeq ($(TESTBUILD),true)
 BASE_FLAGS += -Werror -Wcast-qual -Wconversion -Wformat -Wformat-security -Wredundant-decls -Wshadow -Wstrict-overflow -fstrict-overflow -Wundef -Wwrite-strings
-BASE_FLAGS += -Wpointer-arith -Wabi -Winit-self -Wuninitialized -Wstrict-overflow=5
+BASE_FLAGS += -Wpointer-arith -Wabi=98 -Winit-self -Wuninitialized -Wstrict-overflow=5
 # BASE_FLAGS += -Wfloat-equal
 ifeq ($(CC),clang)
 BASE_FLAGS += -Wdocumentation -Wdocumentation-unknown-command
diff --git a/dgl/Cairo.hpp b/dgl/Cairo.hpp
index 8857e126..567aa63f 100644
--- a/dgl/Cairo.hpp
+++ b/dgl/Cairo.hpp
@@ -106,8 +106,8 @@ public:
     CairoImage& operator=(const CairoImage& image) noexcept;
 
     // FIXME this should not be needed
-    inline void loadFromMemory(const char* rawData, uint w, uint h, ImageFormat format = kImageFormatBGRA)
-    { loadFromMemory(rawData, Size<uint>(w, h), format); };
+    inline void loadFromMemory(const char* rdata, uint w, uint h, ImageFormat fmt = kImageFormatBGRA)
+    { loadFromMemory(rdata, Size<uint>(w, h), fmt); };
     inline void draw(const GraphicsContext& context)
     { drawAt(context, Point<int>(0, 0)); };
     inline void drawAt(const GraphicsContext& context, int x, int y)
diff --git a/dgl/OpenGL.hpp b/dgl/OpenGL.hpp
index f28f2277..deb677fc 100644
--- a/dgl/OpenGL.hpp
+++ b/dgl/OpenGL.hpp
@@ -222,8 +222,8 @@ public:
     OpenGLImage& operator=(const OpenGLImage& image) noexcept;
 
     // FIXME this should not be needed
-    inline void loadFromMemory(const char* rawData, uint w, uint h, ImageFormat format = kImageFormatBGRA)
-    { loadFromMemory(rawData, Size<uint>(w, h), format); };
+    inline void loadFromMemory(const char* rdata, uint w, uint h, ImageFormat fmt = kImageFormatBGRA)
+    { loadFromMemory(rdata, Size<uint>(w, h), fmt); };
     inline void draw(const GraphicsContext& context)
     { drawAt(context, Point<int>(0, 0)); };
     inline void drawAt(const GraphicsContext& context, int x, int y)
diff --git a/dgl/Vulkan.hpp b/dgl/Vulkan.hpp
index d7b73056..4fd7c45a 100644
--- a/dgl/Vulkan.hpp
+++ b/dgl/Vulkan.hpp
@@ -88,8 +88,8 @@ public:
     VulkanImage& operator=(const VulkanImage& image) noexcept;
 
     // FIXME this should not be needed
-    inline void loadFromMemory(const char* rawData, uint w, uint h, ImageFormat format = kImageFormatBGRA)
-    { loadFromMemory(rawData, Size<uint>(w, h), format); };
+    inline void loadFromMemory(const char* rdata, uint w, uint h, ImageFormat fmt = kImageFormatBGRA)
+    { loadFromMemory(rdata, Size<uint>(w, h), fmt); };
     inline void draw(const GraphicsContext& context)
     { drawAt(context, Point<int>(0, 0)); };
     inline void drawAt(const GraphicsContext& context, int x, int y)
diff --git a/dgl/src/Cairo.cpp b/dgl/src/Cairo.cpp
index f92e3bd2..c505099f 100644
--- a/dgl/src/Cairo.cpp
+++ b/dgl/src/Cairo.cpp
@@ -326,22 +326,22 @@ CairoImage::CairoImage()
       surfacedata(nullptr),
       datarefcount(nullptr) {}
 
-CairoImage::CairoImage(const char* const rawData, const uint width, const uint height, const ImageFormat format)
-    : ImageBase(rawData, width, height, format),
+CairoImage::CairoImage(const char* const rdata, const uint w, const uint h, const ImageFormat fmt)
+    : ImageBase(rdata, w, h, fmt),
       surface(nullptr),
       surfacedata(nullptr),
       datarefcount(nullptr)
 {
-    loadFromMemory(rawData, width, height, format);
+    loadFromMemory(rdata, w, h, fmt);
 }
 
-CairoImage::CairoImage(const char* const rawData, const Size<uint>& size, const ImageFormat format)
-    : ImageBase(rawData, size, format),
+CairoImage::CairoImage(const char* const rdata, const Size<uint>& s, const ImageFormat fmt)
+    : ImageBase(rdata, s, fmt),
       surface(nullptr),
       surfacedata(nullptr),
       datarefcount(nullptr)
 {
-    loadFromMemory(rawData, size, format);
+    loadFromMemory(rdata, s, fmt);
 }
 
 CairoImage::CairoImage(const CairoImage& image)
@@ -368,11 +368,11 @@ CairoImage::~CairoImage()
 void CairoImage::loadFromMemory(const char* const rdata, const Size<uint>& s, const ImageFormat fmt) noexcept
 {
     const cairo_format_t cairoformat = asCairoImageFormat(fmt);
-    const uint width  = s.getWidth();
-    const uint height = s.getHeight();
-    const int stride  = cairo_format_stride_for_width(cairoformat, width);
+    const int width  = static_cast<int>(s.getWidth());
+    const int height = static_cast<int>(s.getHeight());
+    const int stride = cairo_format_stride_for_width(cairoformat, width);
 
-    uchar* const newdata = (uchar*)std::malloc(width * height * stride * 4);
+    uchar* const newdata = (uchar*)std::malloc(static_cast<size_t>(width * height * stride * 4));
     DISTRHO_SAFE_ASSERT_RETURN(newdata != nullptr,);
 
     cairo_surface_t* const newsurface = cairo_image_surface_create_for_data(newdata, cairoformat, width, height, stride);
@@ -401,13 +401,13 @@ void CairoImage::loadFromMemory(const char* const rdata, const Size<uint>& s, co
         break;
     case kImageFormatBGR:
         // BGR8 to CAIRO_FORMAT_RGB24
-        for (uint h = 0; h < height; ++h)
+        for (int h = 0; h < height; ++h)
         {
-            for (uint w = 0; w < width; ++w)
+            for (int w = 0; w < width; ++w)
             {
-                newdata[h*width*4+w*4+0] = rdata[h*width*3+w*3+0];
-                newdata[h*width*4+w*4+1] = rdata[h*width*3+w*3+1];
-                newdata[h*width*4+w*4+2] = rdata[h*width*3+w*3+2];
+                newdata[h*width*4+w*4+0] = static_cast<uchar>(rdata[h*width*3+w*3+0]);
+                newdata[h*width*4+w*4+1] = static_cast<uchar>(rdata[h*width*3+w*3+1]);
+                newdata[h*width*4+w*4+2] = static_cast<uchar>(rdata[h*width*3+w*3+2]);
                 newdata[h*width*4+w*4+3] = 0;
             }
         }
@@ -415,16 +415,16 @@ void CairoImage::loadFromMemory(const char* const rdata, const Size<uint>& s, co
     case kImageFormatBGRA:
         // BGRA8 to CAIRO_FORMAT_ARGB32
         // FIXME something is wrong here...
-        for (uint h = 0, t; h < height; ++h)
+        for (int h = 0, t; h < height; ++h)
         {
-            for (uint w = 0; w < width; ++w)
+            for (int w = 0; w < width; ++w)
             {
                 if ((t = rdata[h*width*4+w*4+3]) != 0)
                 {
-                    newdata[h*width*4+w*4+0] = rdata[h*width*4+w*4+0];
-                    newdata[h*width*4+w*4+1] = rdata[h*width*4+w*4+1];
-                    newdata[h*width*4+w*4+2] = rdata[h*width*4+w*4+2];
-                    newdata[h*width*4+w*4+3] = t;
+                    newdata[h*width*4+w*4+0] = static_cast<uchar>(rdata[h*width*4+w*4+0]);
+                    newdata[h*width*4+w*4+1] = static_cast<uchar>(rdata[h*width*4+w*4+1]);
+                    newdata[h*width*4+w*4+2] = static_cast<uchar>(rdata[h*width*4+w*4+2]);
+                    newdata[h*width*4+w*4+3] = static_cast<uchar>(t);
                 }
                 else
                 {
@@ -476,6 +476,11 @@ void CairoImage::loadFromPNG(const char* const pngData, const uint pngSize) noex
     cairo_surface_t* const newsurface = cairo_image_surface_create_from_png_stream(PngReaderData::read, &readerData);
     DISTRHO_SAFE_ASSERT_RETURN(newsurface != nullptr,);
 
+    const int newwidth = cairo_image_surface_get_width(newsurface);
+    const int newheight = cairo_image_surface_get_height(newsurface);
+    DISTRHO_SAFE_ASSERT_INT_RETURN(newwidth > 0, newwidth,);
+    DISTRHO_SAFE_ASSERT_INT_RETURN(newheight > 0, newheight,);
+
     cairo_surface_destroy(surface);
 
     if (datarefcount != nullptr && --(*datarefcount) == 0)
@@ -489,7 +494,7 @@ void CairoImage::loadFromPNG(const char* const pngData, const uint pngSize) noex
 
     rawData = nullptr;
     format = kImageFormatNull; // asCairoImageFormat(cairo_image_surface_get_format(newsurface));
-    size = Size<uint>(cairo_image_surface_get_width(newsurface), cairo_image_surface_get_height(newsurface));
+    size = Size<uint>(static_cast<uint>(newwidth), static_cast<uint>(newheight));
 }
 
 void CairoImage::drawAt(const GraphicsContext& context, const Point<int>& pos)
@@ -597,7 +602,7 @@ void ImageBaseKnob<CairoImage>::PrivateData::cleanup()
    Get the pixel size in bytes.
    @return pixel size, or 0 if the format is unknown, or pixels are not aligned to bytes.
 */
-static uint getBytesPerPixel(cairo_format_t format) noexcept
+static int getBytesPerPixel(const cairo_format_t format) noexcept
 {
     switch (format)
     {
@@ -617,17 +622,17 @@ static uint getBytesPerPixel(cairo_format_t format) noexcept
     }
 }
 
-static cairo_surface_t* getRegion(cairo_surface_t* origsurface, uint x, uint y, uint width, uint height) noexcept
+static cairo_surface_t* getRegion(cairo_surface_t* origsurface, int x, int y, int width, int height) noexcept
 {
     const cairo_format_t format = cairo_image_surface_get_format(origsurface);
-    const uint bpp = getBytesPerPixel(format);
+    const int bpp = getBytesPerPixel(format);
 
     if (bpp == 0)
         return nullptr;
 
-    const uint fullWidth  = cairo_image_surface_get_width(origsurface);
-    const uint fullHeight = cairo_image_surface_get_height(origsurface);
-    const uint stride     = cairo_image_surface_get_stride(origsurface);
+    const int fullWidth   = cairo_image_surface_get_width(origsurface);
+    const int fullHeight  = cairo_image_surface_get_height(origsurface);
+    const int stride      = cairo_image_surface_get_stride(origsurface);
     uchar* const fullData = cairo_image_surface_get_data(origsurface);
 
     x = (x < fullWidth) ? x : fullWidth;
@@ -635,7 +640,7 @@ static cairo_surface_t* getRegion(cairo_surface_t* origsurface, uint x, uint y,
     width = (x + width < fullWidth) ? width : (fullWidth - x);
     height = (x + height < fullHeight) ? height : (fullHeight - x);
 
-    uchar* const data = fullData + x * bpp + y * stride;
+    uchar* const data = fullData + (x * bpp + y * stride);
     return cairo_image_surface_create_for_data(data, format, width, height, stride);
 }
 
@@ -644,22 +649,22 @@ void ImageBaseKnob<CairoImage>::onDisplay()
 {
     const GraphicsContext& context(getGraphicsContext());
     cairo_t* const handle = ((const CairoGraphicsContext&)context).handle;
-    const float normValue = ((pData->usingLog ? pData->invlogscale(pData->value) : pData->value) - pData->minimum)
+    const double normValue = ((pData->usingLog ? pData->invlogscale(pData->value) : pData->value) - pData->minimum)
         / (pData->maximum - pData->minimum);
 
     cairo_surface_t* surface = (cairo_surface_t*)pData->cairoSurface;
 
     if (! pData->isReady)
     {
-        const uint layerW = pData->imgLayerWidth;
-        const uint layerH = pData->imgLayerHeight;
-        uint layerNum = 0;
+        const int layerW = static_cast<int>(pData->imgLayerWidth);
+        const int layerH = static_cast<int>(pData->imgLayerHeight);
+        int layerNum = 0;
 
         if (pData->rotationAngle == 0)
-            layerNum = uint(normValue * float(pData->imgLayerCount-1));
+            layerNum = static_cast<int>(normValue * static_cast<double>(pData->imgLayerCount - 1) + 0.5);
 
-        const uint layerX = pData->isImgVertical ? 0 : layerNum * layerW;
-        const uint layerY = !pData->isImgVertical ? 0 : layerNum * layerH;
+        const int layerX = pData->isImgVertical ? 0 : layerNum * layerW;
+        const int layerY = !pData->isImgVertical ? 0 : layerNum * layerH;
 
         cairo_surface_t* newsurface;
 
@@ -672,8 +677,8 @@ void ImageBaseKnob<CairoImage>::onDisplay()
             newsurface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, layerW, layerH);
             cairo_t* const cr = cairo_create(newsurface);
             cairo_translate(cr, 0.5 * layerW, 0.5 * layerH);
-            cairo_rotate(cr, normValue * pData->rotationAngle * (float)(M_PI / 180));
-            cairo_set_source_surface(cr, pData->image.getSurface(), -0.5f * layerW, -0.5f * layerH);
+            cairo_rotate(cr, normValue * pData->rotationAngle * (M_PI / 180));
+            cairo_set_source_surface(cr, pData->image.getSurface(), -0.5 * layerW, -0.5 * layerH);
             cairo_paint(cr);
             cairo_destroy(cr);
         }
diff --git a/dgl/src/Common.hpp b/dgl/src/Common.hpp
index b55a62ac..b0f86629 100644
--- a/dgl/src/Common.hpp
+++ b/dgl/src/Common.hpp
@@ -75,7 +75,7 @@ struct ButtonImpl {
         // button was pressed, wait for release
         if (ev.press && self->contains(ev.pos))
         {
-            button = ev.button;
+            button = static_cast<int>(ev.button);
             state  = kStateDown;
             self->repaint();
             return true;
@@ -135,8 +135,8 @@ struct ImageBaseKnob<ImageType>::PrivateData {
 
     int rotationAngle;
     bool dragging;
-    int lastX;
-    int lastY;
+    double lastX;
+    double lastY;
 
     Callback* callback;
 
@@ -164,18 +164,18 @@ struct ImageBaseKnob<ImageType>::PrivateData {
     void init();
     void cleanup();
 
-    inline float logscale(float value) const
+    inline float logscale(const float v) const
     {
         const float b = std::log(maximum/minimum)/(maximum-minimum);
         const float a = maximum/std::exp(maximum*b);
-        return a * std::exp(b*value);
+        return a * std::exp(b*v);
     }
 
-    inline float invlogscale(float value) const
+    inline float invlogscale(const float v) const
     {
         const float b = std::log(maximum/minimum)/(maximum-minimum);
         const float a = maximum/std::exp(maximum*b);
-        return std::log(value/a)/b;
+        return std::log(v/a)/b;
     }
 
     DISTRHO_DECLARE_NON_COPYABLE(PrivateData)
diff --git a/dgl/src/Geometry.cpp b/dgl/src/Geometry.cpp
index 4ad25db4..f2c44c44 100644
--- a/dgl/src/Geometry.cpp
+++ b/dgl/src/Geometry.cpp
@@ -249,7 +249,22 @@ bool Size<T>::isInvalid() const noexcept
 template<typename T>
 Size<int> Size<T>::toInt() const noexcept
 {
-    return Size<int>(fWidth, fHeight);
+    return Size<int>(static_cast<int>(fWidth),
+                     static_cast<int>(fHeight));
+}
+
+template<>
+Size<int> Size<double>::toInt() const noexcept
+{
+    return Size<int>(static_cast<int>(fWidth + 0.5),
+                     static_cast<int>(fHeight + 0.5));
+}
+
+template<>
+Size<int> Size<float>::toInt() const noexcept
+{
+    return Size<int>(static_cast<int>(fWidth + 0.5f),
+                     static_cast<int>(fHeight + 0.5f));
 }
 
 template<typename T>
@@ -645,10 +660,10 @@ Triangle<T>::Triangle(const T& x1, const T& y1, const T& x2, const T& y2, const
       pos3(x3, y3) {}
 
 template<typename T>
-Triangle<T>::Triangle(const Point<T>& pos1, const Point<T>& pos2, const Point<T>& pos3) noexcept
-    : pos1(pos1),
-      pos2(pos2),
-      pos3(pos3) {}
+Triangle<T>::Triangle(const Point<T>& p1, const Point<T>& p2, const Point<T>& p3) noexcept
+    : pos1(p1),
+      pos2(p2),
+      pos3(p3) {}
 
 template<typename T>
 Triangle<T>::Triangle(const Triangle<T>& tri) noexcept
@@ -710,24 +725,24 @@ Rectangle<T>::Rectangle() noexcept
       size(0, 0) {}
 
 template<typename T>
-Rectangle<T>::Rectangle(const T& x, const T& y, const T& width, const T& height) noexcept
+Rectangle<T>::Rectangle(const T& x, const T& y, const T& w, const T& h) noexcept
     : pos(x, y),
-      size(width, height) {}
+      size(w, h) {}
 
 template<typename T>
-Rectangle<T>::Rectangle(const T& x, const T& y, const Size<T>& size) noexcept
+Rectangle<T>::Rectangle(const T& x, const T& y, const Size<T>& s) noexcept
     : pos(x, y),
-      size(size) {}
+      size(s) {}
 
 template<typename T>
-Rectangle<T>::Rectangle(const Point<T>& pos, const T& width, const T& height) noexcept
-    : pos(pos),
-      size(width, height) {}
+Rectangle<T>::Rectangle(const Point<T>& p, const T& w, const T& h) noexcept
+    : pos(p),
+      size(w, h) {}
 
 template<typename T>
-Rectangle<T>::Rectangle(const Point<T>& pos, const Size<T>& size) noexcept
-    : pos(pos),
-      size(size) {}
+Rectangle<T>::Rectangle(const Point<T>& p, const Size<T>& s) noexcept
+    : pos(p),
+      size(s) {}
 
 template<typename T>
 Rectangle<T>::Rectangle(const Rectangle<T>& rect) noexcept
@@ -865,9 +880,9 @@ bool Rectangle<T>::contains(const T& x, const T& y) const noexcept
 }
 
 template<typename T>
-bool Rectangle<T>::contains(const Point<T>& pos) const noexcept
+bool Rectangle<T>::contains(const Point<T>& p) const noexcept
 {
-    return contains(pos.x, pos.y);
+    return contains(p.x, p.y);
 }
 
 template<typename T>
diff --git a/dgl/src/ImageBase.cpp b/dgl/src/ImageBase.cpp
index ea3477b6..ae04b147 100644
--- a/dgl/src/ImageBase.cpp
+++ b/dgl/src/ImageBase.cpp
@@ -81,12 +81,12 @@ ImageFormat ImageBase::getFormat() const noexcept
     return format;
 }
 
-void ImageBase::loadFromMemory(const char* const rawData,
-                                 const uint width,
-                                 const uint height,
-                                 const ImageFormat format) noexcept
+void ImageBase::loadFromMemory(const char* const rdata,
+                               const uint width,
+                               const uint height,
+                               const ImageFormat fmt) noexcept
 {
-    loadFromMemory(rawData, Size<uint>(width, height), format);
+    loadFromMemory(rdata, Size<uint>(width, height), fmt);
 }
 
 void ImageBase::loadFromMemory(const char* const rdata, const Size<uint>& s, const ImageFormat fmt) noexcept
diff --git a/dgl/src/ImageBaseWidgets.cpp b/dgl/src/ImageBaseWidgets.cpp
index fcf04b1c..2d056446 100644
--- a/dgl/src/ImageBaseWidgets.cpp
+++ b/dgl/src/ImageBaseWidgets.cpp
@@ -201,8 +201,8 @@ ImageBaseKnob<ImageType>::PrivateData::PrivateData(const ImageType& img, const O
         orientation(o),
         rotationAngle(0),
         dragging(false),
-        lastX(0),
-        lastY(0),
+        lastX(0.0),
+        lastY(0.0),
         callback(nullptr),
         alwaysRepaint(false),
         isImgVertical(img.getHeight() > img.getWidth()),
@@ -228,8 +228,8 @@ ImageBaseKnob<ImageType>::PrivateData::PrivateData(PrivateData* const other)
         orientation(other->orientation),
         rotationAngle(other->rotationAngle),
         dragging(false),
-        lastX(0),
-        lastY(0),
+        lastX(0.0),
+        lastY(0.0),
         callback(other->callback),
         alwaysRepaint(other->alwaysRepaint),
         isImgVertical(other->isImgVertical),
@@ -245,21 +245,21 @@ template <class ImageType>
 void ImageBaseKnob<ImageType>::PrivateData::assignFrom(PrivateData* const other)
 {
     cleanup();
-    image    = other->image;
-    minimum  = other->minimum;
-    maximum  = other->maximum;
-    step     = other->step;
-    value    = other->value;
-    valueDef = other->valueDef;
-    valueTmp = value;
-    usingDefault  = other->usingDefault;
-    usingLog      = other->usingLog;
-    orientation   = other->orientation;
-    rotationAngle = other->rotationAngle;
-    dragging = false;
-    lastX    = 0;
-    lastY    = 0;
-    callback = other->callback;
+    image          = other->image;
+    minimum        = other->minimum;
+    maximum        = other->maximum;
+    step           = other->step;
+    value          = other->value;
+    valueDef       = other->valueDef;
+    valueTmp       = value;
+    usingDefault   = other->usingDefault;
+    usingLog       = other->usingLog;
+    orientation    = other->orientation;
+    rotationAngle  = other->rotationAngle;
+    dragging       = false;
+    lastX          = 0.0;
+    lastY          = 0.0;
+    callback       = other->callback;
     alwaysRepaint  = other->alwaysRepaint;
     isImgVertical  = other->isImgVertical;
     imgLayerWidth  = other->imgLayerWidth;
@@ -476,7 +476,7 @@ bool ImageBaseKnob<ImageType>::onMotion(const MotionEvent& ev)
 
     if (pData->orientation == ImageBaseKnob<ImageType>::Horizontal)
     {
-        if (const int movX = ev.pos.getX() - pData->lastX)
+        if (const double movX = ev.pos.getX() - pData->lastX)
         {
             d     = (ev.mod & kModifierControl) ? 2000.0f : 200.0f;
             value = (pData->usingLog ? pData->invlogscale(pData->valueTmp) : pData->valueTmp) + (float(pData->maximum - pData->minimum) / d * float(movX));
@@ -485,7 +485,7 @@ bool ImageBaseKnob<ImageType>::onMotion(const MotionEvent& ev)
     }
     else if (pData->orientation == ImageBaseKnob<ImageType>::Vertical)
     {
-        if (const int movY = pData->lastY - ev.pos.getY())
+        if (const double movY = pData->lastY - ev.pos.getY())
         {
             d     = (ev.mod & kModifierControl) ? 2000.0f : 200.0f;
             value = (pData->usingLog ? pData->invlogscale(pData->valueTmp) : pData->valueTmp) + (float(pData->maximum - pData->minimum) / d * float(movY));
@@ -529,7 +529,8 @@ bool ImageBaseKnob<ImageType>::onScroll(const ScrollEvent& ev)
         return false;
 
     const float d     = (ev.mod & kModifierControl) ? 2000.0f : 200.0f;
-    float       value = (pData->usingLog ? pData->invlogscale(pData->valueTmp) : pData->valueTmp) + (float(pData->maximum - pData->minimum) / d * 10.f * ev.delta.getY());
+    float       value = (pData->usingLog ? pData->invlogscale(pData->valueTmp) : pData->valueTmp)
+                      + ((pData->maximum - pData->minimum) / d * 10.f * static_cast<float>(ev.delta.getY()));
 
     if (pData->usingLog)
         value = pData->logscale(value);
@@ -569,8 +570,8 @@ struct ImageBaseSlider<ImageType>::PrivateData {
     bool dragging;
     bool inverted;
     bool valueIsSet;
-    int  startedX;
-    int  startedY;
+    double startedX;
+    double startedY;
 
     Callback* callback;
 
@@ -590,8 +591,8 @@ struct ImageBaseSlider<ImageType>::PrivateData {
           dragging(false),
           inverted(false),
           valueIsSet(false),
-          startedX(0),
-          startedY(0),
+          startedX(0.0),
+          startedY(0.0),
           callback(nullptr),
           startPos(),
           endPos(),
@@ -814,8 +815,8 @@ bool ImageBaseSlider<ImageType>::onMouse(const MouseEvent& ev)
         }
 
         float vper;
-        const int x = ev.pos.getX();
-        const int y = ev.pos.getY();
+        const double x = ev.pos.getX();
+        const double y = ev.pos.getY();
 
         if (pData->startPos.getY() == pData->endPos.getY())
         {
@@ -880,8 +881,8 @@ bool ImageBaseSlider<ImageType>::onMotion(const MotionEvent& ev)
         return false;
 
     const bool horizontal = pData->startPos.getY() == pData->endPos.getY();
-    const int x = ev.pos.getX();
-    const int y = ev.pos.getY();
+    const double x = ev.pos.getX();
+    const double y = ev.pos.getY();
 
     if ((horizontal && pData->sliderArea.containsX(x)) || (pData->sliderArea.containsY(y) && ! horizontal))
     {
diff --git a/dgl/src/OpenGL.cpp b/dgl/src/OpenGL.cpp
index ad179532..5af0588a 100644
--- a/dgl/src/OpenGL.cpp
+++ b/dgl/src/OpenGL.cpp
@@ -60,7 +60,7 @@ void Line<T>::draw(const GraphicsContext&, const T width)
 {
     DISTRHO_SAFE_ASSERT_RETURN(width != 0,);
 
-    glLineWidth(width);
+    glLineWidth(static_cast<GLfloat>(width));
     drawLine<T>(posStart, posEnd);
 }
 
@@ -120,7 +120,7 @@ void Circle<T>::drawOutline(const GraphicsContext&, const T lineWidth)
 {
     DISTRHO_SAFE_ASSERT_RETURN(lineWidth != 0,);
 
-    glLineWidth(lineWidth);
+    glLineWidth(static_cast<GLfloat>(lineWidth));
     drawCircle<T>(fPos, fNumSegments, fSize, fSin, fCos, true);
 }
 
@@ -177,7 +177,7 @@ void Triangle<T>::drawOutline(const GraphicsContext&, const T lineWidth)
 {
     DISTRHO_SAFE_ASSERT_RETURN(lineWidth != 0,);
 
-    glLineWidth(lineWidth);
+    glLineWidth(static_cast<GLfloat>(lineWidth));
     drawTriangle<T>(pos1, pos2, pos3, true);
 }
 
@@ -244,7 +244,7 @@ void Rectangle<T>::drawOutline(const GraphicsContext&, const T lineWidth)
 {
     DISTRHO_SAFE_ASSERT_RETURN(lineWidth != 0,);
 
-    glLineWidth(lineWidth);
+    glLineWidth(static_cast<GLfloat>(lineWidth));
     drawRectangle<T>(*this, true);
 }
 
@@ -348,8 +348,8 @@ OpenGLImage::OpenGLImage()
     DISTRHO_SAFE_ASSERT(textureId != 0);
 }
 
-OpenGLImage::OpenGLImage(const char* const rawData, const uint width, const uint height, const ImageFormat format)
-    : ImageBase(rawData, width, height, format),
+OpenGLImage::OpenGLImage(const char* const rdata, const uint w, const uint h, const ImageFormat fmt)
+    : ImageBase(rdata, w, h, fmt),
       textureId(0),
       setupCalled(false)
 {
@@ -357,8 +357,8 @@ OpenGLImage::OpenGLImage(const char* const rawData, const uint width, const uint
     DISTRHO_SAFE_ASSERT(textureId != 0);
 }
 
-OpenGLImage::OpenGLImage(const char* const rawData, const Size<uint>& size, const ImageFormat format)
-    : ImageBase(rawData, size, format),
+OpenGLImage::OpenGLImage(const char* const rdata, const Size<uint>& s, const ImageFormat fmt)
+    : ImageBase(rdata, s, fmt),
       textureId(0),
       setupCalled(false)
 {
@@ -402,8 +402,8 @@ OpenGLImage& OpenGLImage::operator=(const OpenGLImage& image) noexcept
 }
 
 // deprecated calls
-OpenGLImage::OpenGLImage(const char* const rawData, const uint width, const uint height, const GLenum format)
-    : ImageBase(rawData, width, height, asDISTRHOImageFormat(format)),
+OpenGLImage::OpenGLImage(const char* const rdata, const uint w, const uint h, const GLenum fmt)
+    : ImageBase(rdata, w, h, asDISTRHOImageFormat(fmt)),
       textureId(0),
       setupCalled(false)
 {
@@ -411,8 +411,8 @@ OpenGLImage::OpenGLImage(const char* const rawData, const uint width, const uint
     DISTRHO_SAFE_ASSERT(textureId != 0);
 }
 
-OpenGLImage::OpenGLImage(const char* const rawData, const Size<uint>& size, const GLenum format)
-    : ImageBase(rawData, size, asDISTRHOImageFormat(format)),
+OpenGLImage::OpenGLImage(const char* const rdata, const Size<uint>& s, const GLenum fmt)
+    : ImageBase(rdata, s, asDISTRHOImageFormat(fmt)),
       textureId(0),
       setupCalled(false)
 {
@@ -568,31 +568,33 @@ void SubWidget::PrivateData::display(const uint width, const uint height, const
     {
         // full viewport size
         glViewport(0,
-                   -(height * autoScaleFactor - height),
-                   width * autoScaleFactor,
-                   height * autoScaleFactor);
+                   -static_cast<int>(height * autoScaleFactor - height + 0.5),
+                   static_cast<int>(width * autoScaleFactor + 0.5),
+                   static_cast<int>(height * autoScaleFactor + 0.5));
     }
     else if (needsViewportScaling)
     {
         // limit viewport to widget bounds
         glViewport(absolutePos.getX(),
-                   height - self->getHeight() - absolutePos.getY(),
-                   self->getWidth(),
-                   self->getHeight());
+                   static_cast<int>(height - self->getHeight()) - absolutePos.getY(),
+                   static_cast<int>(self->getWidth()),
+                   static_cast<int>(self->getHeight()));
     }
     else
     {
         // set viewport pos
-        glViewport(absolutePos.getX() * autoScaleFactor,
-                    -std::round((height * autoScaleFactor - height) + (absolutePos.getY() * autoScaleFactor)),
-                    std::round(width * autoScaleFactor),
-                    std::round(height * autoScaleFactor));
+        glViewport(static_cast<int>(absolutePos.getX() * autoScaleFactor + 0.5),
+                   -static_cast<int>(std::round((height * autoScaleFactor - height)
+                                     + (absolutePos.getY() * autoScaleFactor))),
+                   static_cast<int>(std::round(width * autoScaleFactor)),
+                   static_cast<int>(std::round(height * autoScaleFactor)));
 
         // then cut the outer bounds
-        glScissor(absolutePos.getX() * autoScaleFactor,
-                  height - std::round((self->getHeight() + absolutePos.getY()) * autoScaleFactor),
-                  std::round(self->getWidth() * autoScaleFactor),
-                  std::round(self->getHeight() * autoScaleFactor));
+        glScissor(static_cast<int>(absolutePos.getX() * autoScaleFactor + 0.5),
+                  static_cast<int>(height - std::round((static_cast<int>(self->getHeight()) + absolutePos.getY())
+                                                       * autoScaleFactor)),
+                  static_cast<int>(std::round(self->getWidth() * autoScaleFactor)),
+                  static_cast<int>(std::round(self->getHeight() * autoScaleFactor)));
 
         glEnable(GL_SCISSOR_TEST);
         needsDisableScissor = true;
@@ -622,9 +624,16 @@ void TopLevelWidget::PrivateData::display()
 
     // full viewport size
     if (window.pData->autoScaling)
-        glViewport(0, -(height * autoScaleFactor - height), width * autoScaleFactor, height * autoScaleFactor);
+    {
+        glViewport(0,
+                   -static_cast<int>(height * autoScaleFactor - height),
+                   static_cast<int>(width * autoScaleFactor),
+                   static_cast<int>(height * autoScaleFactor));
+    }
     else
-        glViewport(0, 0, width, height);
+    {
+        glViewport(0, 0, static_cast<int>(width), static_cast<int>(height));
+    }
 
     // main widget drawing
     self->onDisplay();
diff --git a/dgl/src/SubWidget.cpp b/dgl/src/SubWidget.cpp
index b22360ca..3e0ef59d 100644
--- a/dgl/src/SubWidget.cpp
+++ b/dgl/src/SubWidget.cpp
@@ -64,8 +64,8 @@ Rectangle<int> SubWidget::getAbsoluteArea() const noexcept
 
 Rectangle<uint> SubWidget::getConstrainedAbsoluteArea() const noexcept
 {
-    return Rectangle<uint>(std::max(0, getAbsoluteX()),
-                           std::max(0, getAbsoluteY()),
+    return Rectangle<uint>(static_cast<uint>(std::max(0, getAbsoluteX())),
+                           static_cast<uint>(std::max(0, getAbsoluteY())),
                            getSize());
 }
 
diff --git a/dgl/src/Vulkan.cpp b/dgl/src/Vulkan.cpp
index 5f15d4b2..d18b3c32 100644
--- a/dgl/src/Vulkan.cpp
+++ b/dgl/src/Vulkan.cpp
@@ -170,11 +170,11 @@ template class Rectangle<ushort>;
 VulkanImage::VulkanImage()
     : ImageBase() {}
 
-VulkanImage::VulkanImage(const char* const rawData, const uint width, const uint height, const ImageFormat format)
-    : ImageBase(rawData, width, height, format) {}
+VulkanImage::VulkanImage(const char* const rdata, const uint w, const uint h, const ImageFormat fmt)
+    : ImageBase(rdata, w, h, fmt) {}
 
-VulkanImage::VulkanImage(const char* const rawData, const Size<uint>& size, const ImageFormat format)
-    : ImageBase(rawData, size, format) {}
+VulkanImage::VulkanImage(const char* const rdata, const Size<uint>& s, const ImageFormat fmt)
+    : ImageBase(rdata, s, fmt) {}
 
 VulkanImage::VulkanImage(const VulkanImage& image)
     : ImageBase(image.rawData, image.size, image.format) {}
diff --git a/dgl/src/Window.cpp b/dgl/src/Window.cpp
index 66a02ef4..9866d606 100644
--- a/dgl/src/Window.cpp
+++ b/dgl/src/Window.cpp
@@ -93,18 +93,25 @@ void Window::setResizable(const bool resizable)
 
 uint Window::getWidth() const noexcept
 {
-    return puglGetFrame(pData->view).width;
+    const double width = puglGetFrame(pData->view).width;
+    DISTRHO_SAFE_ASSERT_RETURN(width >= 0.0, 0);
+    return static_cast<uint>(width + 0.5);
 }
 
 uint Window::getHeight() const noexcept
 {
-    return puglGetFrame(pData->view).height;
+    const double height = puglGetFrame(pData->view).height;
+    DISTRHO_SAFE_ASSERT_RETURN(height >= 0.0, 0);
+    return static_cast<uint>(height + 0.5);
 }
 
 Size<uint> Window::getSize() const noexcept
 {
     const PuglRect rect = puglGetFrame(pData->view);
-    return Size<uint>(rect.width, rect.height);
+    DISTRHO_SAFE_ASSERT_RETURN(rect.width >= 0.0, Size<uint>());
+    DISTRHO_SAFE_ASSERT_RETURN(rect.height >= 0.0, Size<uint>());
+    return Size<uint>(static_cast<uint>(rect.width + 0.5),
+                      static_cast<uint>(rect.height + 0.5));
 }
 
 void Window::setWidth(const uint width)
@@ -123,7 +130,7 @@ void Window::setSize(const uint width, const uint height)
 
     // FIXME add default and min props for this
     if (pData->minWidth == 0 && pData->minHeight == 0)
-        puglSetDefaultSize(pData->view, width, height);
+        puglSetDefaultSize(pData->view, static_cast<int>(width), static_cast<int>(height));
 
     puglSetWindowSize(pData->view, width, height);
 }
@@ -237,16 +244,16 @@ void Window::setGeometryConstraints(const uint minimumWidth,
     const double scaleFactor = pData->scaleFactor;
 
     puglSetGeometryConstraints(pData->view,
-                               minimumWidth * scaleFactor,
-                               minimumHeight * scaleFactor,
+                               static_cast<uint>(minimumWidth * scaleFactor + 0.5),
+                               static_cast<uint>(minimumHeight * scaleFactor + 0.5),
                                keepAspectRatio);
 
     if (scaleFactor != 1.0)
     {
         const Size<uint> size(getSize());
 
-        setSize(size.getWidth() * scaleFactor,
-                size.getHeight() * scaleFactor);
+        setSize(static_cast<uint>(size.getWidth() * scaleFactor + 0.5),
+                static_cast<uint>(size.getHeight() * scaleFactor + 0.5));
     }
 }
 
diff --git a/dgl/src/WindowPrivateData.cpp b/dgl/src/WindowPrivateData.cpp
index 302d3ac4..e4dd6e4c 100644
--- a/dgl/src/WindowPrivateData.cpp
+++ b/dgl/src/WindowPrivateData.cpp
@@ -146,7 +146,7 @@ Window::PrivateData::PrivateData(Application& a, Window* const s,
 {
     if (isEmbed)
     {
-        puglSetDefaultSize(view, width, height);
+        puglSetDefaultSize(view, static_cast<int>(width), static_cast<int>(height));
         puglSetParentWindow(view, parentWindowHandle);
     }
 
@@ -246,8 +246,8 @@ void Window::PrivateData::show()
 
         // FIXME
         PuglRect rect = puglGetFrame(view);
-        puglSetDefaultSize(view, rect.width, rect.height);
-        puglSetWindowSize(view, rect.width, rect.height);
+        puglSetDefaultSize(view, static_cast<int>(rect.width), static_cast<int>(rect.height));
+        puglSetWindowSize(view, static_cast<uint>(rect.width), static_cast<uint>(rect.height));
 
 #ifdef DISTRHO_OS_WINDOWS
         puglWin32ShowWindowCentered(view);
@@ -395,7 +395,7 @@ void Window::PrivateData::startModal()
 
     // FIXME?
     PuglRect rect = puglGetFrame(view);
-    puglSetDefaultSize(view, rect.width, rect.height);
+    puglSetDefaultSize(view, static_cast<int>(rect.width), static_cast<int>(rect.height));
 
     // make sure both parent and ourselves are visible
     modal.parent->show();
@@ -464,7 +464,7 @@ void Window::PrivateData::runAsModal(const bool blockWait)
 // -----------------------------------------------------------------------
 // pugl events
 
-void Window::PrivateData::onPuglConfigure(const int width, const int height)
+void Window::PrivateData::onPuglConfigure(const double width, const double height)
 {
     DISTRHO_SAFE_ASSERT_INT2_RETURN(width > 1 && height > 1, width, height,);
 
@@ -472,16 +472,18 @@ void Window::PrivateData::onPuglConfigure(const int width, const int height)
 
     if (autoScaling)
     {
-        const double scaleHorizontal = static_cast<double>(width) / static_cast<double>(minWidth);
-        const double scaleVertical   = static_cast<double>(height) / static_cast<double>(minHeight);
+        const double scaleHorizontal = width  / static_cast<double>(minWidth);
+        const double scaleVertical   = height / static_cast<double>(minHeight);
         autoScaleFactor = scaleHorizontal < scaleVertical ? scaleHorizontal : scaleVertical;
     }
 
-    self->onReshape(width, height);
+    const uint uwidth = static_cast<uint>(width + 0.5);
+    const uint uheight = static_cast<uint>(height + 0.5);
+    self->onReshape(uwidth, uheight);
 
 #ifndef DPF_TEST_WINDOW_CPP
     if (topLevelWidget != nullptr)
-        topLevelWidget->setSize(width, height);
+        topLevelWidget->setSize(uwidth, uheight);
 #endif
 
     // always repaint after a resize
diff --git a/dgl/src/WindowPrivateData.hpp b/dgl/src/WindowPrivateData.hpp
index 47dbf9ab..934a6222 100644
--- a/dgl/src/WindowPrivateData.hpp
+++ b/dgl/src/WindowPrivateData.hpp
@@ -91,6 +91,9 @@ struct Window::PrivateData : IdleCallback {
         {
             DISTRHO_SAFE_ASSERT(! enabled);
         }
+
+        DISTRHO_DECLARE_NON_COPYABLE(Modal)
+        DISTRHO_PREVENT_HEAP_ALLOCATION
     } modal;
 
     /** Constructor for a regular, standalone window. */
@@ -144,7 +147,7 @@ struct Window::PrivateData : IdleCallback {
     void runAsModal(bool blockWait);
 
     // pugl events
-    void onPuglConfigure(int width, int height);
+    void onPuglConfigure(double width, double height);
     void onPuglExpose();
     void onPuglClose();
     void onPuglFocus(bool focus, CrossingMode mode);
diff --git a/dgl/src/pugl.cpp b/dgl/src/pugl.cpp
index d7dac469..7372b830 100644
--- a/dgl/src/pugl.cpp
+++ b/dgl/src/pugl.cpp
@@ -194,14 +194,14 @@ void puglSetMatchingBackendForCurrentBuild(PuglView* const view)
 
 PuglStatus puglSetGeometryConstraints(PuglView* const view, const uint width, const uint height, const bool aspect)
 {
-    view->minWidth  = width;
-    view->minHeight = height;
+    view->minWidth  = (int)width;
+    view->minHeight = (int)height;
 
     if (aspect) {
-        view->minAspectX = width;
-        view->minAspectY = height;
-        view->maxAspectX = width;
-        view->maxAspectY = height;
+        view->minAspectX = (int)width;
+        view->minAspectY = (int)height;
+        view->maxAspectX = (int)width;
+        view->maxAspectY = (int)height;
     }
 
 #if defined(DISTRHO_OS_HAIKU)