Split ImageHelper to ImageHelper, SDLImageHelper, OpenGLImageHelper.

1 files changed, 280 insertions, 0 deletions

diff --git a/src/resources/sdlimagehelper.cpp b/src/resources/sdlimagehelper.cpp
new file mode 100644
index 000000000..66e1bc823
--- /dev/null
+++ b/src/resources/sdlimagehelper.cpp
@@ -0,0 +1,280 @@
+/*
+ *  The ManaPlus Client
+ *  Copyright (C) 2004-2009  The Mana World Development Team
+ *  Copyright (C) 2009-2010  The Mana Developers
+ *  Copyright (C) 2011-2012  The ManaPlus Developers
+ *
+ *  This file is part of The ManaPlus Client.
+ *
+ *  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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "resources/sdlimagehelper.h"
+
+#include "resources/dye.h"
+#include "resources/resourcemanager.h"
+
+#include "client.h"
+#include "logger.h"
+#include "main.h"
+
+#include "utils/stringutils.h"
+
+#include "resources/image.h"
+
+#include <SDL_image.h>
+#include <SDL_rotozoom.h>
+
+#include "debug.h"
+
+bool SDLImageHelper::mEnableAlphaCache = false;
+
+Resource *SDLImageHelper::load(SDL_RWops *rw, Dye const &dye)
+{
+    SDL_Surface *tmpImage = IMG_Load_RW(rw, 1);
+
+    if (!tmpImage)
+    {
+        logger->log("Error, image load failed: %s", IMG_GetError());
+        return nullptr;
+    }
+
+    SDL_Surface *surf = nullptr;
+    SDL_PixelFormat rgba;
+    rgba.palette = nullptr;
+    rgba.BitsPerPixel = 32;
+    rgba.BytesPerPixel = 4;
+    rgba.colorkey = 0;
+    rgba.alpha = 255;
+    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;
+
+    surf = SDL_ConvertSurface(tmpImage, &rgba, SDL_SWSURFACE);
+    SDL_FreeSurface(tmpImage);
+
+    Uint32 *pixels = static_cast<Uint32 *>(surf->pixels);
+    DyePalette *pal = dye.getSPalete();
+
+    if (pal)
+    {
+        for (Uint32 *p_end = pixels + surf->w * surf->h;
+             pixels != p_end; ++pixels)
+        {
+            Uint8 *p = (Uint8 *)pixels;
+            const int alpha = *p & 255;
+            if (!alpha)
+                continue;
+            pal->replaceColor(p + 1);
+        }
+    }
+    else
+    {
+        for (Uint32 *p_end = pixels + surf->w * surf->h;
+             pixels != p_end; ++pixels)
+        {
+            const Uint32 p = *pixels;
+            const int alpha = p & 255;
+            if (!alpha)
+                continue;
+            int v[3];
+            v[0] = (p >> 24) & 255;
+            v[1] = (p >> 16) & 255;
+            v[2] = (p >> 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 *SDLImageHelper::load(SDL_Surface *tmpImage)
+{
+    return _SDLload(tmpImage);
+}
+
+Image *SDLImageHelper::createTextSurface(SDL_Surface *tmpImage, float alpha)
+{
+    if (!tmpImage)
+        return nullptr;
+
+    Image *img;
+
+    bool hasAlpha = false;
+    bool converted = false;
+
+    const int sz = tmpImage->w * tmpImage->h;
+
+    // The alpha channel to be filled with alpha values
+    Uint8 *alphaChannel = new Uint8[sz];
+
+    const SDL_PixelFormat * const fmt = tmpImage->format;
+    if (fmt->Amask)
+    {
+        for (int i = 0; i < sz; ++ i)
+        {
+            Uint32 c = (static_cast<Uint32*>(tmpImage->pixels))[i];
+
+            unsigned v = (c & fmt->Amask) >> fmt->Ashift;
+            Uint8 a = (v << fmt->Aloss) + (v >> (8 - (fmt->Aloss << 1)));
+
+            Uint8 a2 = static_cast<Uint8>(static_cast<float>(a) * alpha);
+
+            c &= ~fmt->Amask;
+            c |= ((a2 >> fmt->Aloss) << fmt->Ashift & fmt->Amask);
+            (static_cast<Uint32*>(tmpImage->pixels))[i] = c;
+
+            if (a != 255)
+                hasAlpha = true;
+
+            alphaChannel[i] = a;
+        }
+    }
+
+    SDL_Surface *image;
+
+    // Convert the surface to the current display format
+    if (hasAlpha)
+    {
+        image = SDL_DisplayFormatAlpha(tmpImage);
+    }
+    else
+    {
+        image = SDL_DisplayFormat(tmpImage);
+
+        // We also delete the alpha channel since
+        // it's not used.
+        delete [] alphaChannel;
+        alphaChannel = nullptr;
+    }
+
+    if (!image)
+    {
+        logger->log1("Error: Image convert failed.");
+        delete [] alphaChannel;
+        return nullptr;
+    }
+
+    if (converted)
+        SDL_FreeSurface(tmpImage);
+
+    img = new Image(image, hasAlpha, alphaChannel);
+    img->mAlpha = alpha;
+    return img;
+}
+
+SDL_Surface* SDLImageHelper::SDLDuplicateSurface(SDL_Surface* tmpImage)
+{
+    if (!tmpImage || !tmpImage->format)
+        return nullptr;
+
+    return SDL_ConvertSurface(tmpImage, tmpImage->format, SDL_SWSURFACE);
+}
+
+Image *SDLImageHelper::_SDLload(SDL_Surface *tmpImage)
+{
+    if (!tmpImage)
+        return nullptr;
+
+    bool hasAlpha = false;
+    bool converted = false;
+
+    if (tmpImage->format->BitsPerPixel != 32)
+    {
+        tmpImage = convertTo32Bit(tmpImage);
+
+        if (!tmpImage)
+            return nullptr;
+        converted = true;
+    }
+
+    const int sz = tmpImage->w * tmpImage->h;
+
+    // The alpha channel to be filled with alpha values
+    Uint8 *alphaChannel = new Uint8[sz];
+
+    // Figure out whether the image uses its alpha layer
+    if (!tmpImage->format->palette)
+    {
+        const SDL_PixelFormat * const fmt = tmpImage->format;
+        if (fmt->Amask)
+        {
+            for (int i = 0; i < sz; ++ i)
+            {
+                unsigned v = ((static_cast<Uint32*>(tmpImage->pixels))[i]
+                    & fmt->Amask) >> fmt->Ashift;
+                Uint8 a = (v << fmt->Aloss) + (v >> (8 - (fmt->Aloss << 1)));
+
+                if (a != 255)
+                    hasAlpha = true;
+
+                alphaChannel[i] = a;
+            }
+        }
+        else
+        {
+            if (SDL_ALPHA_OPAQUE != 255)
+            {
+                hasAlpha = true;
+                memset(alphaChannel, SDL_ALPHA_OPAQUE, sz);
+            }
+        }
+    }
+    else
+    {
+        if (SDL_ALPHA_OPAQUE != 255)
+        {
+            hasAlpha = true;
+            memset(alphaChannel, SDL_ALPHA_OPAQUE, sz);
+        }
+    }
+
+    SDL_Surface *image;
+
+    // Convert the surface to the current display format
+    if (hasAlpha)
+    {
+        image = SDL_DisplayFormatAlpha(tmpImage);
+    }
+    else
+    {
+        image = SDL_DisplayFormat(tmpImage);
+
+        // We also delete the alpha channel since
+        // it's not used.
+        delete [] alphaChannel;
+        alphaChannel = nullptr;
+    }
+
+    if (!image)
+    {
+        logger->log1("Error: Image convert failed.");
+        delete [] alphaChannel;
+        return nullptr;
+    }
+
+    if (converted)
+        SDL_FreeSurface(tmpImage);
+
+    return new Image(image, hasAlpha, alphaChannel);
+}
+
+int SDLImageHelper::useOpenGL()
+{
+    return 0;
+}