comparison layer/ScrollableImageCache.cpp @ 1040:25b035362c44 spectrogram-minor-refactor

Truncate edges when about to paint beyond limits of cache

 #include "ScrollableImageCache.h"
 
 #include <iostream>
 using namespace std;
 
-#define DEBUG_SCROLLABLE_IMAGE_CACHE 1
+//#define DEBUG_SCROLLABLE_IMAGE_CACHE 1
 
 void
 ScrollableImageCache::scrollTo(sv_frame_t newStartFrame)
 {
     if (!m_v) throw std::logic_error("ScrollableImageCache: not associated with a LayerGeometryProvider");

 	     << m_image.height() << endl;
 	throw std::logic_error("Image height must match cache height in ScrollableImageCache::drawImage");
     }
     if (left < 0 || width < 0 || left + width > m_image.width()) {
 	cerr << "ScrollableImageCache::drawImage: ERROR: Target area (left = "
-	     << left << ", width = " << width << ") out of bounds for cache of "
-	     << "width " << m_image.width() << endl;
+	     << left << ", width = " << width << ", so right = " << left + width
+             << ") out of bounds for cache of width " << m_image.width() << endl;
 	throw std::logic_error("Target area out of bounds in ScrollableImageCache::drawImage");
     }
     if (imageLeft < 0 || imageWidth < 0 ||
 	imageLeft + imageWidth > image.width()) {
 	cerr << "ScrollableImageCache::drawImage: ERROR: Source area (left = "
-	     << imageLeft << ", width = " << imageWidth
-	     << ") out of bounds for image of "
+	     << imageLeft << ", width = " << imageWidth << ", so right = "
+             << imageLeft + imageWidth << ") out of bounds for image of "
 	     << "width " << image.width() << endl;
 	throw std::logic_error("Source area out of bounds in ScrollableImageCache::drawImage");
     }
 	
     QPainter painter(&m_image);