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#include "sdlcursormanager.hpp"
#include <stdexcept>
#include <SDL_endian.h>
#include <SDL_hints.h>
#include <SDL_mouse.h>
#include <SDL_render.h>
#include <osg/Geometry>
#include <osg/GraphicsContext>
#include <osg/TexMat>
#include <osg/Texture2D>
#include <osg/Version>
#include <osgViewer/GraphicsWindow>
#include <components/debug/debuglog.hpp>
#include "imagetosurface.hpp"
#if defined(OSG_LIBRARY_STATIC) && (!defined(ANDROID) || OSG_VERSION_GREATER_THAN(3, 6, 5))
// Sets the default windowing system interface according to the OS.
// Necessary for OpenSceneGraph to do some things, like decompression.
USE_GRAPHICSWINDOW()
#endif
namespace SDLUtil
{
SDLCursorManager::SDLCursorManager()
: mEnabled(false)
, mInitialized(false)
{
}
SDLCursorManager::~SDLCursorManager()
{
CursorMap::const_iterator curs_iter = mCursorMap.begin();
while (curs_iter != mCursorMap.end())
{
SDL_FreeCursor(curs_iter->second);
++curs_iter;
}
mCursorMap.clear();
}
void SDLCursorManager::setEnabled(bool enabled)
{
if (mInitialized && enabled == mEnabled)
return;
mInitialized = true;
mEnabled = enabled;
// turn on hardware cursors
if (enabled)
{
_setGUICursor(mCurrentCursor);
}
// turn off hardware cursors
else
{
SDL_ShowCursor(SDL_FALSE);
}
}
void SDLCursorManager::cursorChanged(std::string_view name)
{
mCurrentCursor = name;
_setGUICursor(mCurrentCursor);
}
void SDLCursorManager::_setGUICursor(std::string_view name)
{
auto it = mCursorMap.find(name);
if (it != mCursorMap.end())
SDL_SetCursor(it->second);
}
void SDLCursorManager::createCursor(std::string_view name, int rotDegrees, osg::Image* image, Uint8 hotspot_x,
Uint8 hotspot_y, int cursorWidth, int cursorHeight)
{
#ifndef ANDROID
_createCursorFromResource(name, rotDegrees, image, hotspot_x, hotspot_y, cursorWidth, cursorHeight);
#endif
}
SDLUtil::SurfaceUniquePtr decompress(
osg::ref_ptr<osg::Image> source, float rotDegrees, int cursorWidth, int cursorHeight)
{
int width = source->s();
int height = source->t();
bool useAlpha = source->isImageTranslucent();
osg::ref_ptr<osg::Image> decompressedImage = new osg::Image;
decompressedImage->setFileName(source->getFileName());
decompressedImage->allocateImage(width, height, 1, useAlpha ? GL_RGBA : GL_RGB, GL_UNSIGNED_BYTE);
for (int s = 0; s < width; ++s)
for (int t = 0; t < height; ++t)
decompressedImage->setColor(source->getColor(s, t, 0), s, t, 0);
Uint32 redMask = 0x000000ff;
Uint32 greenMask = 0x0000ff00;
Uint32 blueMask = 0x00ff0000;
Uint32 alphaMask = useAlpha ? 0xff000000 : 0;
SDL_Surface* cursorSurface = SDL_CreateRGBSurfaceFrom(decompressedImage->data(), width, height,
decompressedImage->getPixelSizeInBits(), decompressedImage->getRowSizeInBytes(), redMask, greenMask,
blueMask, alphaMask);
SDL_Surface* targetSurface
= SDL_CreateRGBSurface(0, cursorWidth, cursorHeight, 32, redMask, greenMask, blueMask, alphaMask);
SDL_Renderer* renderer = SDL_CreateSoftwareRenderer(targetSurface);
SDL_RenderClear(renderer);
SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "1");
SDL_Texture* cursorTexture = SDL_CreateTextureFromSurface(renderer, cursorSurface);
SDL_RenderCopyEx(renderer, cursorTexture, nullptr, nullptr, -rotDegrees, nullptr, SDL_FLIP_VERTICAL);
SDL_DestroyTexture(cursorTexture);
SDL_FreeSurface(cursorSurface);
SDL_DestroyRenderer(renderer);
return SDLUtil::SurfaceUniquePtr(targetSurface, SDL_FreeSurface);
}
void SDLCursorManager::_createCursorFromResource(std::string_view name, int rotDegrees, osg::Image* image,
Uint8 hotspot_x, Uint8 hotspot_y, int cursorWidth, int cursorHeight)
{
if (mCursorMap.find(name) != mCursorMap.end())
return;
try
{
auto surface = decompress(image, static_cast<float>(rotDegrees), cursorWidth, cursorHeight);
// set the cursor and store it for later
SDL_Cursor* curs = SDL_CreateColorCursor(surface.get(), hotspot_x, hotspot_y);
mCursorMap.emplace(name, curs);
}
catch (std::exception& e)
{
Log(Debug::Warning) << e.what();
Log(Debug::Warning) << "Using default cursor.";
return;
}
}
}
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