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//
// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) Contributors to the OpenEXR Project.
//
//-----------------------------------------------------------------------------
//
// Code examples that show how class TiledRgbaInputFile and
// class TiledRgbaOutputFile can be used to read and write
// OpenEXR image files with 16-bit floating-point red,
// green, blue and alpha channels.
//
//-----------------------------------------------------------------------------
#include <ImfTiledRgbaFile.h>
#include <ImfStringAttribute.h>
#include <ImfMatrixAttribute.h>
#include <ImfArray.h>
#include "drawImage.h"
#include <iostream>
#include "namespaceAlias.h"
using namespace IMF;
using namespace std;
using namespace IMATH_NAMESPACE;
void
writeTiledRgbaONE1 (const char fileName[],
const Rgba *pixels,
int width, int height,
int tileWidth, int tileHeight)
{
//
// Write a tiled image with one level using an image-sized framebuffer.
//
TiledRgbaOutputFile out (fileName,
width, height, // image size
tileWidth, tileHeight, // tile size
ONE_LEVEL, // level mode
ROUND_DOWN, // rounding mode
WRITE_RGBA); // channels in file
out.setFrameBuffer (pixels, 1, width);
out.writeTiles (0, out.numXTiles() - 1, 0, out.numYTiles() - 1);
}
void
writeTiledRgbaONE2 (const char fileName[],
int width, int height,
int tileWidth, int tileHeight)
{
//
// Write a tiled image with one level using a tile-sized framebuffer.
//
TiledRgbaOutputFile out (fileName,
width, height, // image size
tileWidth, tileHeight, // tile size
ONE_LEVEL, // level mode
ROUND_DOWN, // rounding mode
WRITE_RGBA); // channels in file
Array2D<Rgba> pixels (tileHeight, tileWidth);
for (int tileY = 0; tileY < out.numYTiles (); ++tileY)
{
for (int tileX = 0; tileX < out.numXTiles (); ++tileX)
{
Box2i range = out.dataWindowForTile (tileX, tileY);
drawImage3 (pixels,
width, height,
range.min.x, range.max.x + 1,
range.min.y, range.max.y + 1,
0, 0);
out.setFrameBuffer (&pixels[-range.min.y][-range.min.x],
1, // xStride
tileWidth); // yStride
out.writeTile (tileX, tileY);
}
}
}
void
writeTiledRgbaMIP1 (const char fileName[],
int width, int height,
int tileWidth, int tileHeight)
{
//
// Write a tiled image with mipmap levels using an image-sized framebuffer.
//
TiledRgbaOutputFile out (fileName,
width, height, // image size
tileWidth, tileHeight, // tile size
MIPMAP_LEVELS, // level mode
ROUND_DOWN, // rounding mode
WRITE_RGBA); // channels in file
Array2D<Rgba> pixels (height, width);
out.setFrameBuffer (&pixels[0][0], 1, width);
for (int level = 0; level < out.numLevels (); ++level)
{
drawImage4 (pixels,
out.levelWidth (level), out.levelHeight (level),
0, out.levelWidth (level),
0, out.levelHeight (level),
level, level);
out.writeTiles (0, out.numXTiles (level) - 1,
0, out.numYTiles (level) - 1,
level);
}
}
void
writeTiledRgbaMIP2 (const char fileName[],
int width, int height,
int tileWidth, int tileHeight)
{
//
// Write a tiled image with mipmap levels using a tile-sized framebuffer.
//
TiledRgbaOutputFile out (fileName,
width, height, // image size
tileWidth, tileHeight, // tile size
MIPMAP_LEVELS, // level mode
ROUND_DOWN, // rounding mode
WRITE_RGBA); // channels in file
Array2D<Rgba> pixels (tileHeight, tileWidth);
for (int level = 0; level < out.numLevels (); ++level)
{
for (int tileY = 0; tileY < out.numYTiles (level); ++tileY)
{
for (int tileX = 0; tileX < out.numXTiles (level); ++tileX)
{
Box2i range = out.dataWindowForTile (tileX, tileY, level);
drawImage4 (pixels,
out.levelWidth (level), out.levelHeight (level),
range.min.x, range.max.x + 1,
range.min.y, range.max.y + 1,
level, level);
out.setFrameBuffer (&pixels[-range.min.y][-range.min.x],
1, // xStride
tileWidth); // yStride
out.writeTile (tileX, tileY, level);
}
}
}
}
void
writeTiledRgbaRIP1 (const char fileName[],
int width, int height,
int tileWidth, int tileHeight)
{
//
// Write a tiled image with ripmap levels using an image-sized framebuffer.
//
TiledRgbaOutputFile out (fileName,
width, height, // image size
tileWidth, tileHeight, // tile size
RIPMAP_LEVELS, // level mode
ROUND_DOWN, // rounding mode
WRITE_RGBA); // channels in file
Array2D<Rgba> pixels (height, width);
out.setFrameBuffer (&pixels[0][0], 1, width);
for (int yLevel = 0; yLevel < out.numYLevels (); ++yLevel)
{
for (int xLevel = 0; xLevel < out.numXLevels (); ++xLevel)
{
drawImage5 (pixels,
out.levelWidth (xLevel), out.levelHeight (yLevel),
0, out.levelWidth (xLevel),
0, out.levelHeight (yLevel),
xLevel, yLevel);
out.writeTiles (0, out.numXTiles (xLevel) - 1,
0, out.numYTiles (yLevel) - 1,
xLevel,
yLevel);
}
}
}
void
writeTiledRgbaRIP2 (const char fileName[],
int width, int height,
int tileWidth, int tileHeight)
{
//
// Write a tiled image with ripmap levels using a tile-sized framebuffer.
//
TiledRgbaOutputFile out (fileName,
width, height, // image size
tileWidth, tileHeight, // tile size
RIPMAP_LEVELS, // level mode
ROUND_DOWN, // rounding mode
WRITE_RGBA); // channels in file
Array2D<Rgba> pixels (tileHeight, tileWidth);
for (int yLevel = 0; yLevel < out.numYLevels(); ++yLevel)
{
for (int xLevel = 0; xLevel < out.numXLevels(); ++xLevel)
{
for (int tileY = 0; tileY < out.numYTiles (yLevel); ++tileY)
{
for (int tileX = 0; tileX < out.numXTiles (xLevel); ++tileX)
{
Box2i range = out.dataWindowForTile (tileX, tileY,
xLevel, yLevel);
drawImage5 (pixels ,
out.levelWidth(xLevel), out.levelHeight(yLevel),
range.min.x, range.max.x + 1,
range.min.y, range.max.y + 1,
xLevel, yLevel);
out.setFrameBuffer (&pixels[-range.min.y][-range.min.x],
1, // xStride
tileWidth); // yStride
out.writeTile (tileX, tileY, xLevel, yLevel);
}
}
}
}
}
void
readTiledRgba1 (const char fileName[],
Array2D<Rgba> &pixels,
int &width,
int &height)
{
TiledRgbaInputFile in (fileName);
Box2i dw = in.dataWindow();
width = dw.max.x - dw.min.x + 1;
height = dw.max.y - dw.min.y + 1;
int dx = dw.min.x;
int dy = dw.min.y;
pixels.resizeErase (height, width);
in.setFrameBuffer (&pixels[-dy][-dx], 1, width);
in.readTiles (0, in.numXTiles() - 1, 0, in.numYTiles() - 1);
}
void
rgbaInterfaceTiledExamples ()
{
cout << "\nRGBA tiled images\n" << endl;
const int tw = 100;
const int th = 75;
int w = 600;
int h = 400;
cout << "writing tiled image with image-size framebuffer" << endl;
Array2D<Rgba> pixels (h, w);
drawImage3 (pixels, w, h, 0, w, 0, h, 0);
writeTiledRgbaONE1 ("tiledrgba1.exr", &pixels[0][0], w, h, tw, th);
cout << "writing tiled image with tile-size framebuffer" << endl;
writeTiledRgbaONE2 ("tiledrgba2.exr", w, h, tw, th);
cout << "writing tiled mipmap image with image-size framebuffer" << endl;
writeTiledRgbaMIP1 ("tiledrgba3.exr", 512, 512, tw, th);
cout << "writing tiled mipmap image with tile-size framebuffer" << endl;
writeTiledRgbaMIP2 ("tiledrgba4.exr", 512, 512, tw, th);
cout << "writing tiled ripmap image with image-size framebuffer" << endl;
writeTiledRgbaRIP1 ("tiledrgba5.exr", 256, 256, tw, th);
cout << "writing tiled ripmap image with tile-size framebuffer" << endl;
writeTiledRgbaRIP2 ("tiledrgba6.exr", 256, 256, tw, th);
cout << "reading tiled rgba file" << endl;
readTiledRgba1 ("tiledrgba1.exr", pixels, w, h);
}
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