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--- IlmImf/ImfRgbaFile.h.orig 2018-08-10 01:34:58 UTC
+++ IlmImf/ImfRgbaFile.h
@@ -60,6 +60,65 @@
OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER
+//-------------------------------------------------------
+// Utility to compute the origin-based pointer address
+//
+// With large offsets for the data window, the naive code
+// can wrap around, especially on 32-bit machines.
+// This can be used to avoid that
+//-------------------------------------------------------
+
+inline const Rgba *
+ComputeBasePointer (
+ const Rgba* ptr,
+ const IMATH_NAMESPACE::V2i& origin,
+ int64_t w,
+ size_t xStride = 1,
+ size_t yStride = 0)
+{
+ if (yStride == 0)
+ yStride = w;
+ int64_t offx = static_cast<int64_t> (origin.x);
+ offx *= xStride;
+ int64_t offy = static_cast<int64_t> (origin.y);
+ offy *= yStride;
+ return ptr - offx - offy;
+}
+
+inline const Rgba *
+ComputeBasePointer (const Rgba* ptr, const IMATH_NAMESPACE::Box2i& dataWindow)
+{
+ return ComputeBasePointer (ptr, dataWindow.min,
+ static_cast<int64_t> (dataWindow.max.x) -
+ static_cast<int64_t> (dataWindow.min.x) + 1);
+}
+
+inline Rgba*
+ComputeBasePointer (
+ Rgba* ptr,
+ const IMATH_NAMESPACE::V2i& origin,
+ int64_t w,
+ size_t xStride = 1,
+ size_t yStride = 0)
+{
+ if (yStride == 0)
+ yStride = w;
+ int64_t offx = static_cast<int64_t> (origin.x);
+ offx *= xStride;
+ int64_t offy = static_cast<int64_t> (origin.y);
+ offy *= yStride;
+ return ptr - offx - offy;
+}
+
+inline Rgba*
+ComputeBasePointer (Rgba* ptr, const IMATH_NAMESPACE::Box2i& dataWindow)
+{
+ return ComputeBasePointer (
+ ptr,
+ dataWindow.min,
+ static_cast<int64_t> (dataWindow.max.x) -
+ static_cast<int64_t> (dataWindow.min.x) + 1);
+}
//
// RGBA output file.
|
