hdr overhaul

* Add full IOProxy support to both input and output.

* This necessitated a major refactor, including sucking the I/O specific
  code from rgbe.{cpp,h} into hdr{input,output}.cpp and getting rid of
  the old files.

* Add a testsuite entry for hdr (shockingly, there was none before)

Author: lgritz

src/cmake/compiler.cmake

@@ -450,7 +450,6 @@ if (PROJECT_IS_TOP_LEVEL)
                                "src/cineon.imageio/libcineon/*"
                                "src/dds.imageio/squish/*"
                                "src/gif.imageio/gif.h"
-                               "src/hdr.imageio/rgbe.cpp"
                                "src/libutil/stb_sprintf.h"
          CACHE STRING "Glob patterns to exclude for clang-format")
     find_program (CLANG_FORMAT_EXE

src/cmake/testing.cmake

@@ -247,6 +247,10 @@ macro (oiio_add_all_tests)
     oiio_add_tests (gif
                     FOUNDVAR GIF_FOUND ENABLEVAR ENABLE_GIF
                     IMAGEDIR oiio-images URL "Recent checkout of oiio-images")
+    oiio_add_tests (hdr
+                    ENABLEVAR ENABLE_HDR
+                    IMAGEDIR openexr-images
+                    URL http://github.com/AcademySoftwareFoundation/openexr-images)
     oiio_add_tests (heif
                     FOUNDVAR Libheif_FOUND ENABLEVAR ENABLE_Libheif
                     URL https://github.com/nokiatech/heif/tree/gh-pages/content)

src/doc/builtinplugins.rst

@@ -638,6 +638,47 @@ preferred except when legacy file access is required.
      - the gamma correction specified in the RGBE header (if it's gamma corrected).
 
 
+**Configuration settings for HDR input**
+
+When opening an HDR ImageInput with a *configuration* (see
+Section :ref:`sec-inputwithconfig`), the following special configuration
+options are supported:
+
+.. list-table::
+   :widths: 30 10 65
+   :header-rows: 1
+
+   * - Input Configuration Attribute
+     - Type
+     - Meaning
+   * - ``oiio:ioproxy``
+     - ptr
+     - Pointer to a ``Filesystem::IOProxy`` that will handle the I/O, for
+       example by reading from memory rather than the file system.
+
+**Configuration settings for HDR output**
+
+When opening a HDR ImageOutput, the following special metadata tokens
+control aspects of the writing itself:
+
+.. list-table::
+   :widths: 30 10 65
+   :header-rows: 1
+
+   * - Output configuration Attribute
+     - Type
+     - Meaning
+   * - ``oiio:ioproxy``
+     - ptr
+     - Pointer to a ``Filesystem::IOProxy`` that will handle the I/O, for
+       example by writing to memory rather than the file system.
+
+**Custom I/O Overrides**
+
+HDR supports the "custom I/O" feature via the
+special ``"oiio:ioproxy"`` attributes (see Sections
+:ref:`sec-imageoutput-ioproxy` and :ref:`sec-imageinput-ioproxy`) as well as
+the `set_ioproxy()` methods.
 
 |
 

src/hdr.imageio/CMakeLists.txt

@@ -2,4 +2,4 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # https://github.com/OpenImageIO/oiio
 
-add_oiio_plugin (rgbe.cpp hdrinput.cpp hdroutput.cpp)
+add_oiio_plugin (hdrinput.cpp hdroutput.cpp)