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/*
* CBitmapHandler.cpp, part of VCMI engine
*
* Authors: listed in file AUTHORS in main folder
*
* License: GNU General Public License v2.0 or later
* Full text of license available in license.txt file, in main folder
*
*/
#include "StdInc.h"
#include "../lib/filesystem/Filesystem.h"
#include "SDL.h"
#include "SDL_image.h"
#include "CBitmapHandler.h"
#include "gui/SDL_Extensions.h"
#include "../lib/vcmi_endian.h"
namespace BitmapHandler
{
SDL_Surface * loadH3PCX(ui8 * data, size_t size);
SDL_Surface * loadBitmapFromDir(std::string path, std::string fname, bool setKey=true);
}
bool isPCX(const ui8 *header)//check whether file can be PCX according to header
{
ui32 fSize = read_le_u32(header + 0);
ui32 width = read_le_u32(header + 4);
ui32 height = read_le_u32(header + 8);
return fSize == width*height || fSize == width*height*3;
}
enum Epcxformat
{
PCX8B,
PCX24B
};
SDL_Surface * BitmapHandler::loadH3PCX(ui8 * pcx, size_t size)
{
SDL_Surface * ret;
Epcxformat format;
int it=0;
ui32 fSize = read_le_u32(pcx + it); it+=4;
ui32 width = read_le_u32(pcx + it); it+=4;
ui32 height = read_le_u32(pcx + it); it+=4;
if (fSize==width*height*3)
format=PCX24B;
else if (fSize==width*height)
format=PCX8B;
else
return nullptr;
if (format==PCX8B)
{
ret = SDL_CreateRGBSurface(0, width, height, 8, 0, 0, 0, 0);
it = 0xC;
for (int i=0; i<height; i++)
{
memcpy((char*)ret->pixels + ret->pitch * i, pcx + it, width);
it+= width;
}
//palette - last 256*3 bytes
it = size-256*3;
for (int i=0;i<256;i++)
{
SDL_Color tp;
tp.r = pcx[it++];
tp.g = pcx[it++];
tp.b = pcx[it++];
tp.a = SDL_ALPHA_OPAQUE;
ret->format->palette->colors[i] = tp;
}
}
else
{
#if (SDL_BYTEORDER == SDL_BIG_ENDIAN)
int bmask = 0xff0000;
int gmask = 0x00ff00;
int rmask = 0x0000ff;
#else
int bmask = 0x0000ff;
int gmask = 0x00ff00;
int rmask = 0xff0000;
#endif
ret = SDL_CreateRGBSurface(0, width, height, 24, rmask, gmask, bmask, 0);
//it == 0xC;
for (int i=0; i<height; i++)
{
memcpy((char*)ret->pixels + ret->pitch * i, pcx + it, width*3);
it+= width*3;
}
}
return ret;
}
SDL_Surface * BitmapHandler::loadBitmapFromDir(std::string path, std::string fname, bool setKey)
{
if(!fname.size())
{
logGlobal->warn("Call to loadBitmap with void fname!");
return nullptr;
}
if (!CResourceHandler::get()->existsResource(ResourceID(path + fname, EResType::IMAGE)))
{
return nullptr;
}
SDL_Surface * ret=nullptr;
auto readFile = CResourceHandler::get()->load(ResourceID(path + fname, EResType::IMAGE))->readAll();
if (isPCX(readFile.first.get()))
{//H3-style PCX
ret = loadH3PCX(readFile.first.get(), readFile.second);
if (ret)
{
if(ret->format->BytesPerPixel == 1 && setKey)
{
CSDL_Ext::setColorKey(ret,ret->format->palette->colors[0]);
}
}
else
{
logGlobal->error("Failed to open %s as H3 PCX!", fname);
return nullptr;
}
}
else
{ //loading via SDL_Image
ret = IMG_Load_RW(
//create SDL_RW with our data (will be deleted by SDL)
SDL_RWFromConstMem((void*)readFile.first.get(), readFile.second),
1); // mark it for auto-deleting
if (ret)
{
if (ret->format->palette)
{
//set correct value for alpha\unused channel
for (int i=0; i < ret->format->palette->ncolors; i++)
ret->format->palette->colors[i].a = SDL_ALPHA_OPAQUE;
}
}
else
{
logGlobal->error("Failed to open %s via SDL_Image", fname);
logGlobal->error("Reason: %s", IMG_GetError());
return nullptr;
}
}
// When modifying anything here please check two use cases:
// 1) Vampire mansion in Necropolis (not 1st color is transparent)
// 2) Battle background when fighting on grass/dirt, topmost sky part (NO transparent color)
// 3) New objects that may use 24-bit images for icons (e.g. witchking arts)
if (ret->format->palette)
{
CSDL_Ext::setDefaultColorKeyPresize(ret);
}
else if (ret->format->Amask)
{
SDL_SetSurfaceBlendMode(ret, SDL_BLENDMODE_BLEND);
}
else // always set
{
CSDL_Ext::setDefaultColorKey(ret);
}
return ret;
}
SDL_Surface * BitmapHandler::loadBitmap(std::string fname, bool setKey)
{
SDL_Surface * bitmap = nullptr;
if (!(bitmap = loadBitmapFromDir("DATA/", fname, setKey)) &&
!(bitmap = loadBitmapFromDir("SPRITES/", fname, setKey)))
{
logGlobal->error("Error: Failed to find file %s", fname);
}
return bitmap;
}
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