Fix crash when opening image in editor

Do not access uninitialized raw image data. The raw data is requested
when the demosaic mode is set to None and the cursor is moved over the
image in the editor. It can occur before the raw data is loaded.

rtengine/rawimagesource.cc

@@ -16,6 +16,7 @@
  *  You should have received a copy of the GNU General Public License
  *  along with RawTherapee.  If not, see <https://www.gnu.org/licenses/>.
  */
+#include <cassert>
 #include <cmath>
 #include <cstdlib>
 #include <iostream>
@@ -743,6 +744,8 @@ void RawImageSource::getWBMults(const ColorTemp &ctemp, const RAWParams &raw, st
 
 void RawImageSource::getImage(const ColorTemp &ctemp, int tran, Imagefloat* image, const PreviewProps &pp, const ToneCurveParams &hrp, const RAWParams &raw)
 {
+    assert(rawData.getHeight() == H && rawData.getWidth() == W);
+
     MyMutex::MyLock lock(getImageMutex);
 
     tran = defTransform(ri, tran);
@@ -1744,6 +1747,8 @@ void RawImageSource::preprocess(const RAWParams &raw, const LensProfParams &lens
 
 void RawImageSource::demosaic(const RAWParams &raw, bool autoContrast, double &contrastThreshold, bool cache)
 {
+    assert(rawData.getHeight() == H && rawData.getWidth() == W);
+
     MyTime t1, t2;
     t1.set();
 
@@ -3837,6 +3842,8 @@ void RawImageSource::hlRecovery(const std::string &method, float* red, float* gr
 
 void RawImageSource::getAutoExpHistogram(LUTu & histogram, int& histcompr)
 {
+    assert(rawData.getHeight() == H && rawData.getWidth() == W);
+
 //    BENCHFUN
     histcompr = 3;
 
@@ -7481,6 +7488,8 @@ void RawImageSource::getrgbloc(int begx, int begy, int yEn, int xEn, int cx, int
 
 void RawImageSource::getAutoWBMultipliersitc(bool extra, double & tempref, double & greenref, double & tempitc, double & greenitc, float &temp0, float &delta,  int &bia, int &dread, int &kcam, int &nocam, float &studgood, float &minchrom, int &kmin,  float &minhist, float &maxhist, int begx, int begy, int yEn, int xEn, int cx, int cy, int bf_h, int bf_w, double & rm, double & gm, double & bm, const WBParams & wbpar, const ColorManagementParams & cmp, const RAWParams & raw, const ToneCurveParams &hrp)
 {
+    assert(rawData.getHeight() == H && rawData.getWidth() == W);
+
 //    BENCHFUN
     constexpr double clipHigh = 64000.0;
 
@@ -7710,6 +7719,8 @@ void RawImageSource::getAutoWBMultipliersitc(bool extra, double & tempref, doubl
 
 void RawImageSource::getAutoWBMultipliers(double &rm, double &gm, double &bm)
 {
+    assert(rawData.getHeight() == H && rawData.getWidth() == W);
+
 //    BENCHFUN
     constexpr double clipHigh = 64000.0;
 
@@ -7926,6 +7937,7 @@ void RawImageSource::getAutoWBMultipliers(double &rm, double &gm, double &bm)
 
 ColorTemp RawImageSource::getSpotWB(std::vector<Coord2D> &red, std::vector<Coord2D> &green, std::vector<Coord2D> &blue, int tran, double equal, StandardObserver observer)
 {
+    assert(rawData.getHeight() == H && rawData.getWidth() == W);
 
     int x;
     int y;
@@ -8265,7 +8277,7 @@ void RawImageSource::init()
 
 void RawImageSource::getRawValues(int x, int y, int rotate, int &R, int &G, int &B)
 {
-    if (d1x) { // Nikon D1x has special sensor. We just skip it
+    if (rawData.getWidth() != W || rawData.getHeight() != H || d1x) { // Nikon D1x has special sensor. We just skip it
         R = G = B = 0;
         return;
     }
@@ -8313,6 +8325,8 @@ bool RawImageSource::isGainMapSupported() const
 
 void RawImageSource::applyDngGainMap(const float black[4], const std::vector<GainMap> &gainMaps)
 {
+    assert(rawData.getHeight() == H && rawData.getWidth() == W);
+
     // now we can apply each gain map to raw_data
     array2D<float> mvals[2][2];