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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 "CBitmapHandler.h"
#include "../renderSDL/SDL_Extensions.h"
#include "../lib/ExceptionsCommon.h"
#include "../lib/filesystem/Filesystem.h"
#include "../lib/vcmi_endian.h"
#include <SDL_image.h>
namespace BitmapHandler
{
SDL_Surface * loadH3PCX(ui8 * data, size_t size);
SDL_Surface * loadBitmapFromDir(const ImagePath & path);
}
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<(int)height; i++)
{
memcpy((char*)ret->pixels + ret->pitch * i, pcx + it, width);
it+= width;
}
//palette - last 256*3 bytes
it = (int)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
{
#ifdef VCMI_ENDIAN_BIG
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<(int)height; i++)
{
memcpy((char*)ret->pixels + ret->pitch * i, pcx + it, width*3);
it+= width*3;
}
}
return ret;
}
SDL_Surface * BitmapHandler::loadBitmapFromDir(const ImagePath & path)
{
if (!CResourceHandler::get()->existsResource(path))
{
return nullptr;
}
SDL_Surface * ret=nullptr;
try {
auto readFile = CResourceHandler::get()->load(path)->readAll();
if (isPCX(readFile.first.get()))
{//H3-style PCX
ret = loadH3PCX(readFile.first.get(), readFile.second);
if (!ret)
{
logGlobal->error("Failed to open %s as H3 PCX!", path.getOriginalName());
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(), (int)readFile.second),
1); // mark it for auto-deleting
if (ret)
{
if (ret->format->palette)
{
// set correct value for alpha\unused channel
// NOTE: might be unnecessary with SDL2
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", path.getOriginalName());
logGlobal->error("Reason: %s", IMG_GetError());
return nullptr;
}
}
}
catch (const DataLoadingException & e)
{
logGlobal->error("%s", e.what());
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)
// 4) special case - there are 2 .bmp images that have semi-transparency (CCELLGRD.BMP & CCELLSHD.BMP)
if (ret->format->palette &&
ret->format->palette->colors[0].r == 255 &&
ret->format->palette->colors[0].g == 0 &&
ret->format->palette->colors[0].b == 255 )
{
constexpr std::array shadow =
{
SDL_Color{ 0, 0, 0, 0},// 100% - transparency
SDL_Color{ 0, 0, 0, 32},// 75% - shadow border,
SDL_Color{ 0, 0, 0, 128},// 50% - shadow body
};
CSDL_Ext::setColorKey(ret, ret->format->palette->colors[0]);
ret->format->palette->colors[0] = shadow[0];
ret->format->palette->colors[1] = shadow[1];
ret->format->palette->colors[4] = shadow[2];
}
else 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(const ImagePath & fname)
{
if(fname.empty())
{
logGlobal->warn("Call to loadBitmap with void fname!");
return nullptr;
}
SDL_Surface * bitmap = loadBitmapFromDir(fname);
if (bitmap != nullptr)
return bitmap;
SDL_Surface * bitmapData = loadBitmapFromDir(fname.addPrefix("DATA/"));
if (bitmapData != nullptr)
return bitmapData;
SDL_Surface * bitmapSprites = loadBitmapFromDir(fname.addPrefix("SPRITES/"));
if (bitmapSprites != nullptr)
return bitmapSprites;
logGlobal->error("Error: Failed to find file %s", fname.getOriginalName());
return nullptr;
}
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