Add support for FLOAT16 image downscale

imagescrollareagl.cpp

@@ -117,7 +117,11 @@ void ImageWidget::setImage(std::shared_ptr<RawImage> image, int index)
     makeCurrent();
     m_rawImage = image;
     if((int)image->width() > m_maxTextureSize || (int)image->height() > m_maxTextureSize)
-        m_rawImage->resize(std::min(m_maxTextureSize, (int)image->width()), std::min(m_maxTextureSize, (int)image->height()));
+    {
+        uint32_t newW = std::min(image->width() * m_maxTextureSize / image->width(), image->width() * m_maxTextureSize / image->height());
+        uint32_t newH = std::min(image->height() * m_maxTextureSize / image->width(), image->height() * m_maxTextureSize / image->height());
+        m_rawImage->resize(newW, newH);
+    }
 
     m_imgWidth = image->width();
     m_imgHeight = image->height();

rawimage.cpp

@@ -4,6 +4,7 @@
 #include <QElapsedTimer>
 #include <QFloat16>
 #include <lcms2.h>
+//#include <libstellarsolver/stellarsolver.h>
 
 using F16 = qfloat16;
 
@@ -394,7 +395,11 @@ const void *RawImage::origData() const
 const void *RawImage::origData(uint32_t row, uint32_t col) const
 {
     if(m_original)
-        return m_original.get() + (m_width * row * m_ch + col * m_ch) * typeSize(m_origType);
+    {
+        col = col * m_origWidth / m_width;
+        row = row * m_origHeight / m_height;
+        return m_original.get() + (m_origWidth * row * m_ch + col * m_ch) * typeSize(m_origType);
+    }
     else
         return m_pixels.get() + (m_width * row * m_ch + col * m_ch) * typeSize(m_type);
 }
@@ -473,6 +478,8 @@ void RawImage::convertToGLFormat()
     size_t s = size() * m_ch;
     if(m_type == UINT32)
     {
+        m_origWidth = m_width;
+        m_origHeight = m_height;
         m_original = std::move(m_pixels);
         allocate(m_width, m_height, m_channels, FLOAT32);
         m_origType = UINT32;
@@ -484,6 +491,8 @@ void RawImage::convertToGLFormat()
     }
     else if(m_type == FLOAT64)
     {
+        m_origWidth = m_width;
+        m_origHeight = m_height;
         m_original = std::move(m_pixels);
         allocate(m_width, m_height, m_channels, FLOAT32);
         m_origType = FLOAT64;
@@ -495,6 +504,8 @@ void RawImage::convertToGLFormat()
     }
     else if(OpenGLES && m_type == UINT16)
     {
+        m_origWidth = m_width;
+        m_origHeight = m_height;
         m_original = std::move(m_pixels);
         allocate(m_width, m_height, m_channels, FLOAT16);
         m_origType = UINT16;
@@ -619,7 +630,7 @@ void boxResample(uint32_t w, uint32_t h, uint32_t ch, uint32_t oldw, uint32_t ol
     const T *in = reinterpret_cast<const T*>(in_);
     T *out = reinterpret_cast<T*>(out_);
     float max = 255.0f;
-    if constexpr(std::is_same<T, uint16_t>::value)
+    if constexpr(std::is_same_v<T, uint16_t>)
         max = UINT16_MAX;
 
     float sx = (float)w / oldw;
@@ -652,8 +663,8 @@ void boxResample(uint32_t w, uint32_t h, uint32_t ch, uint32_t oldw, uint32_t ol
                 }
             }
             for(uint32_t z = 0; z < ch; z++)
-                if constexpr(std::is_floating_point<T>::value)
-                    out[(y * w + x) * ch + z] = p[z];
+                if constexpr(std::is_floating_point_v<T> || std::is_same_v<T, F16>)
+                    out[(y * w + x) * ch + z] = (T)p[z];
                 else
                     out[(y * w + x) * ch + z] = std::clamp(std::round(p[z]), 0.0f, max);
         }
@@ -669,7 +680,9 @@ void RawImage::resize(uint32_t w, uint32_t h)
     uint32_t oldh = m_height;
     m_thumbAspect = (float)m_width / m_height;
 
+    DataType origType = m_origType;
     allocate(w, h, m_channels, m_type);
+    m_origType = origType;
 
     switch(m_type)
     {
@@ -682,6 +695,9 @@ void RawImage::resize(uint32_t w, uint32_t h)
     case RawImage::FLOAT32:
         boxResample<float>(w, h, m_ch, oldw, oldh, old_pixels.get(), m_pixels.get());
         break;
+    case RawImage::FLOAT16:
+        boxResample<F16>(w, h, m_ch, oldw, oldh, old_pixels.get(), m_pixels.get());
+        break;
     default:
         qWarning() << "Resizing format not supported";
         break;

rawimage.h

@@ -67,6 +67,8 @@ protected:
     std::unique_ptr<PixelType[]> m_original;
     uint32_t m_width = 0;
     uint32_t m_height = 0;
+    uint32_t m_origWidth = 0;
+    uint32_t m_origHeight = 0;
     uint32_t m_channels = 0;
     uint32_t m_ch = 0;
     DataType m_type = UINT8;