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/*
* The Mana World
* Copyright (C) 2004 The Mana World Development Team
*
* This file is part of The Mana World.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "resources/image.h"
#include "resources/dye.h"
#include "log.h"
#include <SDL_image.h>
#include "resources/sdlrescalefacility.h"
#ifdef USE_OPENGL
bool Image::mUseOpenGL = false;
int Image::mTextureType = 0;
int Image::mTextureSize = 0;
#endif
Image::Image(SDL_Surface *image):
#ifdef USE_OPENGL
mGLImage(0),
#endif
mSDLSurface(image),
mAlpha(1.0f)
{
mBounds.x = 0;
mBounds.y = 0;
mLoaded = false;
if (mSDLSurface)
{
mBounds.w = mSDLSurface->w;
mBounds.h = mSDLSurface->h;
mAlphaChannel = hasAlphaChannel();
mLoaded = true;
}
else
logger->log(
"Image::Image(SDL_Surface*): Couldn't load invalid Surface!");
}
#ifdef USE_OPENGL
Image::Image(GLuint glimage, int width, int height, int texWidth, int texHeight):
mGLImage(glimage),
mTexWidth(texWidth),
mTexHeight(texHeight),
mSDLSurface(0),
mAlpha(1.0),
mAlphaChannel(true)
{
mBounds.x = 0;
mBounds.y = 0;
mBounds.w = width;
mBounds.h = height;
if (mGLImage)
mLoaded = true;
else
{
logger->log(
"Image::Image(GLuint*, ...): Couldn't load invalid Surface!");
mLoaded = false;
}
}
#endif
Image::~Image()
{
unload();
}
Resource *Image::load(void *buffer, unsigned bufferSize)
{
// Load the raw file data from the buffer in an RWops structure
SDL_RWops *rw = SDL_RWFromMem(buffer, bufferSize);
SDL_Surface *tmpImage = IMG_Load_RW(rw, 1);
if (!tmpImage)
{
logger->log("Error, image load failed: %s", IMG_GetError());
return NULL;
}
Image *image = load(tmpImage);
SDL_FreeSurface(tmpImage);
return image;
}
Resource *Image::load(void *buffer, unsigned bufferSize, Dye const &dye)
{
SDL_RWops *rw = SDL_RWFromMem(buffer, bufferSize);
SDL_Surface *tmpImage = IMG_Load_RW(rw, 1);
if (!tmpImage)
{
logger->log("Error, image load failed: %s", IMG_GetError());
return NULL;
}
SDL_PixelFormat rgba;
rgba.palette = NULL;
rgba.BitsPerPixel = 32;
rgba.BytesPerPixel = 4;
rgba.Rmask = 0xFF000000; rgba.Rloss = 0; rgba.Rshift = 24;
rgba.Gmask = 0x00FF0000; rgba.Gloss = 0; rgba.Gshift = 16;
rgba.Bmask = 0x0000FF00; rgba.Bloss = 0; rgba.Bshift = 8;
rgba.Amask = 0x000000FF; rgba.Aloss = 0; rgba.Ashift = 0;
rgba.colorkey = 0;
rgba.alpha = 255;
SDL_Surface *surf = SDL_ConvertSurface(tmpImage, &rgba, SDL_SWSURFACE);
SDL_FreeSurface(tmpImage);
Uint32 *pixels = static_cast< Uint32 * >(surf->pixels);
for (Uint32 *p_end = pixels + surf->w * surf->h; pixels != p_end; ++pixels)
{
int alpha = *pixels & 255;
if (!alpha) continue;
int v[3];
v[0] = (*pixels >> 24) & 255;
v[1] = (*pixels >> 16) & 255;
v[2] = (*pixels >> 8 ) & 255;
dye.update(v);
*pixels = (v[0] << 24) | (v[1] << 16) | (v[2] << 8) | alpha;
}
Image *image = load(surf);
SDL_FreeSurface(surf);
return image;
}
Image *Image::load(SDL_Surface *tmpImage)
{
#ifdef USE_OPENGL
if (mUseOpenGL)
return _GLload(tmpImage);
#endif
return _SDLload(tmpImage);
}
void Image::unload()
{
mLoaded = false;
if (mSDLSurface)
{
// Free the image surface.
SDL_FreeSurface(mSDLSurface);
mSDLSurface = NULL;
}
#ifdef USE_OPENGL
if (mGLImage)
{
glDeleteTextures(1, &mGLImage);
mGLImage = 0;
}
#endif
}
bool Image::isAnOpenGLOne() const
{
#ifdef USE_OPENGL
return mUseOpenGL;
#else
return false;
#endif
}
bool Image::hasAlphaChannel()
{
if (mLoaded)
return mAlphaChannel;
#ifdef USE_OPENGL
if (mUseOpenGL)
return true;
#endif
if (!mSDLSurface)
return false;
bool hasAlpha = false;
if (mSDLSurface->format->BitsPerPixel == 32)
{
// Figure out whether the image uses its alpha layer
for (int i = 0; i < mSDLSurface->w * mSDLSurface->h; ++i)
{
Uint8 r, g, b, a;
SDL_GetRGBA(
((Uint32*) mSDLSurface->pixels)[i],
mSDLSurface->format,
&r, &g, &b, &a);
if (a != 255)
{
hasAlpha = true;
break;
}
}
}
return hasAlpha;
}
void Image::setAlpha(float a)
{
if (mAlpha == a)
return;
mAlpha = a;
if (mSDLSurface)
{
// Set the alpha value this image is drawn at
SDL_SetAlpha(mSDLSurface, SDL_SRCALPHA, (int) (255 * mAlpha));
}
}
Image* Image::SDLmerge(Image *image, int x, int y)
{
if (!mSDLSurface)
return NULL;
SDL_Surface* surface = new SDL_Surface(*(image->mSDLSurface));
Uint32 surface_pix, cur_pix;
Uint8 r, g, b, a, p_r, p_g, p_b, p_a;
double f_a, f_ca, f_pa;
SDL_PixelFormat *current_fmt = mSDLSurface->format;
SDL_PixelFormat *surface_fmt = surface->format;
int current_offset, surface_offset;
int offset_x, offset_y;
SDL_LockSurface(surface);
SDL_LockSurface(mSDLSurface);
// for each pixel lines of a source image
for (offset_x = (x > 0 ? 0 : -x); offset_x < image->getWidth() &&
x + offset_x < getWidth(); offset_x++)
{
for (offset_y = (y > 0 ? 0 : -y); offset_y < image->getHeight()
&& y + offset_y < getHeight(); offset_y++)
{
// Computing offset on both images
current_offset = (y + offset_y) * getWidth() + x + offset_x;
surface_offset = offset_y * surface->w + offset_x;
// Retrieving a pixel to merge
surface_pix = ((Uint32*) surface->pixels)[surface_offset];
cur_pix = ((Uint32*) mSDLSurface->pixels)[current_offset];
// Retreiving each channel of the pixel using pixel format
r = (Uint8)(((surface_pix & surface_fmt->Rmask) >>
surface_fmt->Rshift) << surface_fmt->Rloss);
g = (Uint8)(((surface_pix & surface_fmt->Gmask) >>
surface_fmt->Gshift) << surface_fmt->Gloss);
b = (Uint8)(((surface_pix & surface_fmt->Bmask) >>
surface_fmt->Bshift) << surface_fmt->Bloss);
a = (Uint8)(((surface_pix & surface_fmt->Amask) >>
surface_fmt->Ashift) << surface_fmt->Aloss);
// Retreiving previous alpha value
p_a = (Uint8)(((cur_pix & current_fmt->Amask) >>
current_fmt->Ashift) << current_fmt->Aloss);
// new pixel with no alpha or nothing on previous pixel
if (a == SDL_ALPHA_OPAQUE || (p_a == 0 && a > 0))
((Uint32 *)(surface->pixels))[current_offset] =
SDL_MapRGBA(current_fmt, r, g, b, a);
else if (a > 0)
{ // alpha is lower => merge color with previous value
f_a = (double) a / 255.0;
f_ca = 1.0 - f_a;
f_pa = (double) p_a / 255.0;
p_r = (Uint8)(((cur_pix & current_fmt->Rmask) >>
current_fmt->Rshift) << current_fmt->Rloss);
p_g = (Uint8)(((cur_pix & current_fmt->Gmask) >>
current_fmt->Gshift) << current_fmt->Gloss);
p_b = (Uint8)(((cur_pix & current_fmt->Bmask) >>
current_fmt->Bshift) << current_fmt->Bloss);
r = (Uint8)((double) p_r * f_ca * f_pa + (double)r * f_a);
g = (Uint8)((double) p_g * f_ca * f_pa + (double)g * f_a);
b = (Uint8)((double) p_b * f_ca * f_pa + (double)b * f_a);
a = (a > p_a ? a : p_a);
((Uint32 *)(surface->pixels))[current_offset] =
SDL_MapRGBA(current_fmt, r, g, b, a);
}
}
}
SDL_UnlockSurface(surface);
SDL_UnlockSurface(mSDLSurface);
Image *newImage = new Image(surface);
return newImage;
}
Image* Image::SDLgetScaledImage(int width, int height)
{
// No scaling on incorrect new values.
if (width == 0 || height == 0)
return NULL;
// No scaling when there is ... no different given size ...
if (width == getWidth() && height == getHeight())
return NULL;
Image* scaledImage = NULL;
SDL_Surface* scaledSurface = NULL;
if (mSDLSurface)
{
scaledSurface = _SDLzoomSurface(mSDLSurface,
(double) width / getWidth(),
(double) height / getHeight(),
1);
// The load function takes of the SDL<->OpenGL implementation
// and about freeing the given SDL_surface*.
if (scaledSurface)
scaledImage = load(scaledSurface);
}
return scaledImage;
}
Image *Image::_SDLload(SDL_Surface *tmpImage)
{
if (!tmpImage)
return NULL;
bool hasAlpha = false;
if (tmpImage->format->BitsPerPixel == 32)
{
// Figure out whether the image uses its alpha layer
for (int i = 0; i < tmpImage->w * tmpImage->h; ++i)
{
Uint8 r, g, b, a;
SDL_GetRGBA(
((Uint32*) tmpImage->pixels)[i],
tmpImage->format,
&r, &g, &b, &a);
if (a != 255)
{
hasAlpha = true;
break;
}
}
}
SDL_Surface *image;
// Convert the surface to the current display format
if (hasAlpha)
image = SDL_DisplayFormatAlpha(tmpImage);
else
image = SDL_DisplayFormat(tmpImage);
if (!image)
{
logger->log("Error: Image convert failed.");
return NULL;
}
return new Image(image);
}
#ifdef USE_OPENGL
Image *Image::_GLload(SDL_Surface *tmpImage)
{
// Flush current error flag.
glGetError();
int width = tmpImage->w;
int height = tmpImage->h;
int realWidth = powerOfTwo(width);
int realHeight = powerOfTwo(height);
if (realWidth < width || realHeight < height)
{
logger->log("Warning: image too large, cropping to %dx%d texture!",
tmpImage->w, tmpImage->h);
}
// Make sure the alpha channel is not used, but copied to destination
SDL_SetAlpha(tmpImage, 0, SDL_ALPHA_OPAQUE);
// Determine 32-bit masks based on byte order
Uint32 rmask, gmask, bmask, amask;
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
rmask = 0xff000000;
gmask = 0x00ff0000;
bmask = 0x0000ff00;
amask = 0x000000ff;
#else
rmask = 0x000000ff;
gmask = 0x0000ff00;
bmask = 0x00ff0000;
amask = 0xff000000;
#endif
SDL_Surface *oldImage = tmpImage;
tmpImage = SDL_CreateRGBSurface(SDL_SWSURFACE, realWidth, realHeight,
32, rmask, gmask, bmask, amask);
if (!tmpImage)
{
logger->log("Error, image convert failed: out of memory");
return NULL;
}
SDL_BlitSurface(oldImage, NULL, tmpImage, NULL);
GLuint texture;
glGenTextures(1, &texture);
glBindTexture(mTextureType, texture);
if (SDL_MUSTLOCK(tmpImage))
SDL_LockSurface(tmpImage);
glTexImage2D(
mTextureType, 0, 4,
tmpImage->w, tmpImage->h,
0, GL_RGBA, GL_UNSIGNED_BYTE,
tmpImage->pixels);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glTexParameteri(mTextureType, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(mTextureType, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
if (SDL_MUSTLOCK(tmpImage)) {
SDL_UnlockSurface(tmpImage);
}
SDL_FreeSurface(tmpImage);
GLenum error = glGetError();
if (error)
{
std::string errmsg = "Unknown error";
switch (error)
{
case GL_INVALID_ENUM:
errmsg = "GL_INVALID_ENUM";
break;
case GL_INVALID_VALUE:
errmsg = "GL_INVALID_VALUE";
break;
case GL_INVALID_OPERATION:
errmsg = "GL_INVALID_OPERATION";
break;
case GL_STACK_OVERFLOW:
errmsg = "GL_STACK_OVERFLOW";
break;
case GL_STACK_UNDERFLOW:
errmsg = "GL_STACK_UNDERFLOW";
break;
case GL_OUT_OF_MEMORY:
errmsg = "GL_OUT_OF_MEMORY";
break;
}
logger->log("Error: Image GL import failed: %s", errmsg.c_str());
return NULL;
}
return new Image(texture, width, height, realWidth, realHeight);
}
void Image::setLoadAsOpenGL(bool useOpenGL)
{
Image::mUseOpenGL = useOpenGL;
}
int Image::powerOfTwo(int input)
{
int value;
if (mTextureType == GL_TEXTURE_2D)
{
value = 1;
while (value < input && value < mTextureSize)
{
value <<= 1;
}
}
else
{
value = input;
}
return value >= mTextureSize ? mTextureSize : value;
}
#endif
Image *Image::getSubImage(int x, int y, int width, int height)
{
// Create a new clipped sub-image
#ifdef USE_OPENGL
if (mUseOpenGL)
return new SubImage(this, mGLImage, x, y, width, height,
mTexWidth, mTexHeight);
#endif
return new SubImage(this, mSDLSurface, x, y, width, height);
}
//============================================================================
// SubImage Class
//============================================================================
SubImage::SubImage(Image *parent, SDL_Surface *image,
int x, int y, int width, int height):
Image(image),
mParent(parent)
{
mParent->incRef();
// Set up the rectangle.
mBounds.x = x;
mBounds.y = y;
mBounds.w = width;
mBounds.h = height;
}
#ifdef USE_OPENGL
SubImage::SubImage(Image *parent, GLuint image,
int x, int y, int width, int height,
int texWidth, int texHeight):
Image(image, width, height, texWidth, texHeight),
mParent(parent)
{
mParent->incRef();
// Set up the rectangle.
mBounds.x = x;
mBounds.y = y;
mBounds.w = width;
mBounds.h = height;
}
#endif
SubImage::~SubImage()
{
// Avoid destruction of the image
mSDLSurface = 0;
#ifdef USE_OPENGL
mGLImage = 0;
#endif
mParent->decRef();
}
Image *SubImage::getSubImage(int x, int y, int w, int h)
{
return mParent->getSubImage(mBounds.x + x, mBounds.y + y, w, h);
}
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