/**
 * Automated SDL_Surface test.
 *
 * Written by Edgar Simo "bobbens"
 *
 * Released under Public Domain.
 */


#include "SDL.h"
#include "SDL_at.h"


#if (SDL_BYTEORDER == SDL_BIG_ENDIAN)
#  define RMASK   0xff000000 /**< Red bit mask. */
#  define GMASK   0x00ff0000 /**< Green bit mask. */
#  define BMASK   0x0000ff00 /**< Blue bit mask. */
#  define AMASK   0x000000ff /**< Alpha bit mask. */
#else
#  define RMASK   0x000000ff /**< Red bit mask. */
#  define GMASK   0x0000ff00 /**< Green bit mask. */
#  define BMASK   0x00ff0000 /**< Blue bit mask. */
#  define AMASK   0xff000000 /**< Alpha bit mask. */
#endif


typedef struct SurfaceImage_s {
   int width;
   int height;
   unsigned int  bytes_per_pixel; /* 3:RGB, 4:RGBA */ 
   const unsigned char pixel_data[];
} SurfaceImage_t;


/*
 * Pull in images for testcases.
 */
#include "primitives.c"
#include "blend.c"
#include "face.c"
#include "blit.c"
#include "blitblend.c"


/**
 * @brief Compares a surface and a surface image for equality.
 *
 *    @param sur Surface to compare.
 *    @param img Image to compare against.
 *    @return 0 if they are the same, -1 on error and positive if different.
 */
static int surface_compare( SDL_Surface *sur, const SurfaceImage_t *img )
{
   int ret;
   int i,j;
   int bpp;
   Uint8 *p, *pd;

   /* Make sure size is the same. */
   if ((sur->w != img->width) || (sur->h != img->height))
      return -1;

   SDL_LockSurface( sur );

   ret = 0;
   bpp = sur->format->BytesPerPixel;

   /* Compare image - should be same format. */
   for (j=0; j<sur->h; j++) {
      for (i=0; i<sur->w; i++) {
         p  = (Uint8 *)sur->pixels + j * sur->pitch + i * bpp;
         pd = (Uint8 *)img->pixel_data + (j*img->width + i) * img->bytes_per_pixel;
         switch (bpp) {
            case 1:
            case 2:
            case 3:
               ret += 1;
               printf("%d BPP not supported yet.\n",bpp);
               break;

            case 4:
               ret += !( (p[0] == pd[0]) &&
                         (p[1] == pd[1]) &&
                         (p[2] == pd[2]) );
               break;
         }
      }
   }

   SDL_UnlockSurface( sur );

   return ret;
}


/**
 * @brief Tests sprite loading.
 */
static void surface_testLoad( SDL_Surface *testsur )
{
   int ret;
   SDL_Surface *face, *rface;

   SDL_ATbegin( "Load Test" );

   /* Clear surface. */
   ret = SDL_FillRect( testsur, NULL,
         SDL_MapRGB( testsur->format, 0, 0, 0 ) );
   if (SDL_ATassert( "SDL_FillRect", ret == 0))
      return;

   /* Create the blit surface. */
   face = SDL_LoadBMP("../icon.bmp");
   if (SDL_ATassert( "SDL_CreateLoadBmp", face != NULL))
      return;

   /* Set transparent pixel as the pixel at (0,0) */
   if (face->format->palette) {
      ret = SDL_SetColorKey(face, (SDL_SRCCOLORKEY | SDL_RLEACCEL),
            *(Uint8 *) face->pixels);
      if (SDL_ATassert( "SDL_SetColorKey", ret == 0))
         return;
   }

   /* Convert to 32 bit to compare. */
   rface = SDL_ConvertSurface( face, testsur->format, 0 );
   if (SDL_ATassert( "SDL_ConvertSurface", rface != NULL))
      return;

   /* See if it's the same. */
   if (SDL_ATassert( "Primitives output not the same.",
            surface_compare( rface, &img_face)==0 ))
      return;

   /* Clean up. */
   SDL_FreeSurface( rface );
   SDL_FreeSurface( face );

   SDL_ATend();
}


/**
 * @brief Tests the SDL primitives for rendering.
 */
static void surface_testPrimitives( SDL_Surface *testsur )
{
   int ret;
   int x, y;
   SDL_Rect rect;

   SDL_ATbegin( "Primitives Test" );

   /* Clear surface. */
   ret = SDL_FillRect( testsur, NULL,
         SDL_MapRGB( testsur->format, 0, 0, 0 ) );
   if (SDL_ATassert( "SDL_FillRect", ret == 0))
      return;

   /* Create the surface. */
   testsur = SDL_CreateRGBSurface( 0, 80, 60, 32, 
         RMASK, GMASK, BMASK, AMASK );
   if (SDL_ATassert( "SDL_CreateRGBSurface", testsur != NULL))
      return;

   /* Draw a rectangle. */
   rect.x = 40;
   rect.y = 0;
   rect.w = 40;
   rect.h = 80;
   ret = SDL_FillRect( testsur, &rect,
         SDL_MapRGB( testsur->format, 13, 73, 200 ) );
   if (SDL_ATassert( "SDL_FillRect", ret == 0))
      return;

   /* Draw a rectangle. */
   rect.x = 10;
   rect.y = 10;
   rect.w = 60;
   rect.h = 40;
   ret = SDL_FillRect( testsur, &rect,
         SDL_MapRGB( testsur->format, 200, 0, 100 ) );
   if (SDL_ATassert( "SDL_FillRect", ret == 0))
      return;

   /* Draw some points like so:
    * X.X.X.X..
    * .X.X.X.X.
    * X.X.X.X.. */
   for (y=0; y<3; y++) {
      x = y % 2;
      for (; x<80; x+=2)
         ret = SDL_DrawPoint( testsur, x, y,
               SDL_MapRGB( testsur->format, x*y, x*y/2, x*y/3 ) );
      if (SDL_ATassert( "SDL_DrawPoint", ret == 0))
         return;
   }

   /* Draw some lines. */
   ret = SDL_DrawLine( testsur, 0, 30, 80, 30,
         SDL_MapRGB( testsur->format, 0, 255, 0 ) );
   if (SDL_ATassert( "SDL_DrawLine", ret == 0))
      return;
   ret = SDL_DrawLine( testsur, 40, 30, 40, 60,
         SDL_MapRGB( testsur->format, 55, 55, 5 ) );
   if (SDL_ATassert( "SDL_DrawLine", ret == 0))
      return;
   ret = SDL_DrawLine( testsur, 0, 60, 80, 0,
         SDL_MapRGB( testsur->format, 5, 105, 105 ) );
   if (SDL_ATassert( "SDL_DrawLine", ret == 0))
      return;

   /* See if it's the same. */
   if (SDL_ATassert( "Primitives output not the same.",
            surface_compare( testsur, &img_primitives )==0 ))
      return;

   SDL_ATend();
}


/**
 * @brief Tests the SDL primitives with alpha for rendering.
 */
static void surface_testPrimitivesBlend( SDL_Surface *testsur )
{
   int ret;
   int i, j;
   SDL_Rect rect;

   SDL_ATbegin( "Primitives Blend Test" );

   /* Clear surface. */
   ret = SDL_FillRect( testsur, NULL,
         SDL_MapRGB( testsur->format, 0, 0, 0 ) );
   if (SDL_ATassert( "SDL_FillRect", ret == 0))
      return;

   /* Create some rectangles for each blend mode. */
   ret = SDL_BlendRect( testsur, NULL, SDL_BLENDMODE_NONE, 255, 255, 255, 0 );
   if (SDL_ATassert( "SDL_BlendRect", ret == 0))
      return;
   rect.x = 10;
   rect.y = 25;
   rect.w = 40;
   rect.h = 25;
   ret = SDL_BlendRect( testsur, &rect, SDL_BLENDMODE_ADD, 240, 10, 10, 75 );
   if (SDL_ATassert( "SDL_BlendRect", ret == 0))
      return;
   rect.x = 30;
   rect.y = 40;
   rect.w = 45;
   rect.h = 15;
   ret = SDL_BlendRect( testsur, &rect, SDL_BLENDMODE_BLEND, 10, 240, 10, 100 );
   if (SDL_ATassert( "SDL_BlendRect", ret == 0))
      return;
   rect.x = 25;
   rect.y = 25;
   rect.w = 25;
   rect.h = 25;
   ret = SDL_BlendRect( testsur, &rect, SDL_BLENDMODE_MOD, 10, 10, 240, 125 );
   if (SDL_ATassert( "SDL_BlendRect", ret == 0))
      return;

   /* Draw blended lines, lines for everyone. */
   for (i=0; i<testsur->w; i+=2)  {
      ret = SDL_BlendLine( testsur, 0, 0, i, 59,
            (((i/2)%3)==0) ? SDL_BLENDMODE_BLEND :
               (((i/2)%3)==1) ? SDL_BLENDMODE_ADD : SDL_BLENDMODE_MOD,
            60+2*i, 240-2*i, 50, 3*i );
      if (SDL_ATassert( "SDL_BlendLine", ret == 0))
         return;
   }
   for (i=0; i<testsur->h; i+=2)  {
      ret = SDL_BlendLine( testsur, 0, 0, 79, i,
            (((i/2)%3)==0) ? SDL_BLENDMODE_BLEND :
               (((i/2)%3)==1) ? SDL_BLENDMODE_ADD : SDL_BLENDMODE_MOD,
            60+2*i, 240-2*i, 50, 3*i );
      if (SDL_ATassert( "SDL_BlendLine", ret == 0))
         return;
   }

   /* Draw points. */
   for (j=0; j<testsur->h; j+=3) {
      for (i=0; i<testsur->w; i+=3) {
      ret = SDL_BlendPoint( testsur, i, j,
            ((((i+j)/3)%3)==0) ? SDL_BLENDMODE_BLEND :
               ((((i+j)/3)%3)==1) ? SDL_BLENDMODE_ADD : SDL_BLENDMODE_MOD,
            j*4, i*3, j*4, i*3 );
      if (SDL_ATassert( "SDL_BlendPoint", ret == 0))
         return;
      }
   }

   /* See if it's the same. */
   if (SDL_ATassert( "Primitives output not the same.",
            surface_compare( testsur, &img_blend )==0 ))
      return;

   SDL_ATend();
}


/**
 * @brief Tests some blitting routines.
 */
static void surface_testBlit( SDL_Surface *testsur )
{
   int ret;
   SDL_Rect rect;
   SDL_Surface *face;
   int i, j, ni, nj;

   SDL_ATbegin( "Blit Tests" );

   /* Clear surface. */
   ret = SDL_FillRect( testsur, NULL,
         SDL_MapRGB( testsur->format, 0, 0, 0 ) );
   if (SDL_ATassert( "SDL_FillRect", ret == 0))
      return;

   /* Create face surface. */
   face = SDL_CreateRGBSurfaceFrom( (void*)img_face.pixel_data,
         img_face.width, img_face.height, 32, img_face.width*4,
         RMASK, GMASK, BMASK, AMASK );
   if (SDL_ATassert( "SDL_CreateRGBSurfaceFrom", face != NULL))
      return;

   /* Constant values. */
   rect.w = face->w;
   rect.h = face->h;
   ni     = testsur->w - face->w;
   nj     = testsur->h - face->h;

   /* Loop blit. */
   for (j=0; j <= nj; j+=4) {
      for (i=0; i <= ni; i+=4) {
         /* Blitting. */
         rect.x = i;
         rect.y = j;
         ret = SDL_BlitSurface( face, NULL, testsur, &rect );
         if (SDL_ATassert( "SDL_BlitSurface", ret == 0))
            return;
      }
   }

   /* See if it's the same. */
   if (SDL_ATassert( "Blitting output not the same (normal blit).",
            surface_compare( testsur, &img_blit )==0 ))
      return;

   /* Clear surface. */
   ret = SDL_FillRect( testsur, NULL,
         SDL_MapRGB( testsur->format, 0, 0, 0 ) );
   if (SDL_ATassert( "SDL_FillRect", ret == 0))
      return;

   /* Test blitting with colour mod. */
   for (j=0; j <= nj; j+=4) {
      for (i=0; i <= ni; i+=4) {
         /* Set colour mod. */
         ret = SDL_SetSurfaceColorMod( face, (255/nj)*j, (255/ni)*i, (255/nj)*j );
         if (SDL_ATassert( "SDL_SetSurfaceColorMod", ret == 0))
            return;

         /* Blitting. */
         rect.x = i;
         rect.y = j;
         ret = SDL_BlitSurface( face, NULL, testsur, &rect );
         if (SDL_ATassert( "SDL_BlitSurface", ret == 0))
            return;
      }
   }

   /* See if it's the same. */
   if (SDL_ATassert( "Blitting output not the same (using SDL_SetSurfaceColorMod).",
            surface_compare( testsur, &img_blitColour )==0 ))
      return;

   /* Clear surface. */
   ret = SDL_FillRect( testsur, NULL,
         SDL_MapRGB( testsur->format, 0, 0, 0 ) );
   if (SDL_ATassert( "SDL_FillRect", ret == 0))
      return;

   /* Restore colour. */
   ret = SDL_SetSurfaceColorMod( face, 255, 255, 255 );
   if (SDL_ATassert( "SDL_SetSurfaceColorMod", ret == 0))
      return;

   /* Test blitting with colour mod. */
   for (j=0; j <= nj; j+=4) {
      for (i=0; i <= ni; i+=4) {
         /* Set alpha mod. */
         ret = SDL_SetSurfaceAlphaMod( face, (255/ni)*i );
         if (SDL_ATassert( "SDL_SetSurfaceAlphaMod", ret == 0))
            return;

         /* Blitting. */
         rect.x = i;
         rect.y = j;
         ret = SDL_BlitSurface( face, NULL, testsur, &rect );
         if (SDL_ATassert( "SDL_BlitSurface", ret == 0))
            return;
      }
   }

   /* See if it's the same. */
   if (SDL_ATassert( "Blitting output not the same (using SDL_SetSurfaceAlphaMod).",
            surface_compare( testsur, &img_blitAlpha )==0 ))
      return;

   /* Clean up. */
   SDL_FreeSurface( face );

   SDL_ATend();
}


/**
 * @brief Tests a blend mode.
 */
static int surface_testBlitBlendMode( SDL_Surface *testsur, SDL_Surface *face, int mode )
{
   int ret;
   int i, j, ni, nj;
   SDL_Rect rect;

   /* Clear surface. */
   ret = SDL_FillRect( testsur, NULL,
         SDL_MapRGB( testsur->format, 0, 0, 0 ) );
   if (SDL_ATassert( "SDL_FillRect", ret == 0))
      return 1;

   /* Steps to take. */
   ni     = testsur->w - face->w;
   nj     = testsur->h - face->h;

   /* Constant values. */
   rect.w = face->w;
   rect.h = face->h;

   /* Test blend mode. */
   for (j=0; j <= nj; j+=4) {
      for (i=0; i <= ni; i+=4) {
         /* Set blend mode. */
         ret = SDL_SetSurfaceBlendMode( face, mode );
         if (SDL_ATassert( "SDL_SetSurfaceBlendMode", ret == 0))
            return 1;

         /* Blitting. */
         rect.x = i;
         rect.y = j;
         ret = SDL_BlitSurface( face, NULL, testsur, &rect );
         if (SDL_ATassert( "SDL_BlitSurface", ret == 0))
            return 1;
      }
   }

   return 0;
}


/**
 * @brief Tests some more blitting routines.
 */
static void surface_testBlitBlend( SDL_Surface *testsur )
{
   int ret;
   SDL_Rect rect;
   SDL_Surface *face;
   int i, j, ni, nj;
   int mode;

   SDL_ATbegin( "Blit Blending Tests" );

   /* Clear surface. */
   ret = SDL_FillRect( testsur, NULL,
         SDL_MapRGB( testsur->format, 0, 0, 0 ) );
   if (SDL_ATassert( "SDL_FillRect", ret == 0))
      return;

   /* Create the blit surface. */
   face = SDL_CreateRGBSurfaceFrom( (void*)img_face.pixel_data,
         img_face.width, img_face.height, 32, img_face.width*4,
         RMASK, GMASK, BMASK, AMASK );
   if (SDL_ATassert( "SDL_CreateRGBSurfaceFrom", face != NULL))
      return;

   /* Set alpha mod. */
   ret = SDL_SetSurfaceAlphaMod( face, 100 );
   if (SDL_ATassert( "SDL_SetSurfaceAlphaMod", ret == 0))
      return;

   /* Steps to take. */
   ni     = testsur->w - face->w;
   nj     = testsur->h - face->h;

   /* Constant values. */
   rect.w = face->w;
   rect.h = face->h;

   /* Test None. */
   if (surface_testBlitBlendMode( testsur, face, SDL_BLENDMODE_NONE ))
      return;
   if (SDL_ATassert( "Blitting blending output not the same (using SDL_BLENDMODE_NONE).",
            surface_compare( testsur, &img_blendNone )==0 ))
      return;

   /* Test Mask. */
   if (surface_testBlitBlendMode( testsur, face, SDL_BLENDMODE_MASK ))
      return;
   if (SDL_ATassert( "Blitting blending output not the same (using SDL_BLENDMODE_MASK).",
            surface_compare( testsur, &img_blendMask )==0 ))
      return;

   /* Test Blend. */
   if (surface_testBlitBlendMode( testsur, face, SDL_BLENDMODE_BLEND ))
      return;
   if (SDL_ATassert( "Blitting blending output not the same (using SDL_BLENDMODE_BLEND).",
            surface_compare( testsur, &img_blendBlend )==0 ))
      return;

   /* Test Add. */
   if (surface_testBlitBlendMode( testsur, face, SDL_BLENDMODE_ADD ))
      return;
   if (SDL_ATassert( "Blitting blending output not the same (using SDL_BLENDMODE_ADD).",
            surface_compare( testsur, &img_blendAdd )==0 ))
      return;

   /* Test Mod. */
   if (surface_testBlitBlendMode( testsur, face, SDL_BLENDMODE_MOD ))
      return;
   if (SDL_ATassert( "Blitting blending output not the same (using SDL_BLENDMODE_MOD).",
            surface_compare( testsur, &img_blendMod )==0 ))
      return;

   /* Clear surface. */
   ret = SDL_FillRect( testsur, NULL,
         SDL_MapRGB( testsur->format, 0, 0, 0 ) );
   if (SDL_ATassert( "SDL_FillRect", ret == 0))
      return;

   /* Loop blit. */
   for (j=0; j <= nj; j+=4) {
      for (i=0; i <= ni; i+=4) {

         /* Set colour mod. */
         ret = SDL_SetSurfaceColorMod( face, (255/nj)*j, (255/ni)*i, (255/nj)*j );
         if (SDL_ATassert( "SDL_SetSurfaceColorMod", ret == 0))
            return;

         /* Set alpha mod. */
         ret = SDL_SetSurfaceAlphaMod( face, (100/ni)*i );
         if (SDL_ATassert( "SDL_SetSurfaceAlphaMod", ret == 0))
            return;

         /* Crazy blending mode magic. */
         mode = (i/4*j/4) % 4;
         if (mode==0) mode = SDL_BLENDMODE_MASK;
         else if (mode==1) mode = SDL_BLENDMODE_BLEND;
         else if (mode==2) mode = SDL_BLENDMODE_ADD;
         else if (mode==3) mode = SDL_BLENDMODE_MOD;
         ret = SDL_SetSurfaceBlendMode( face, mode );
         if (SDL_ATassert( "SDL_SetSurfaceBlendMode", ret == 0))
            return;

         /* Blitting. */
         rect.x = i;
         rect.y = j;
         ret = SDL_BlitSurface( face, NULL, testsur, &rect );
         if (SDL_ATassert( "SDL_BlitSurface", ret == 0))
            return;
      }
   }

   /* Check to see if matches. */
   if (SDL_ATassert( "Blitting blending output not the same (using SDL_BLEND_*).",
            surface_compare( testsur, &img_blendAll )==0 ))
      return;

   /* Clean up. */
   SDL_FreeSurface( face );

   SDL_ATend();
}


/**
 * @brief Entry point.
 */
int main( int argc, const char *argv[] )
{
   (void) argc;
   (void) argv;
   SDL_Surface *testsur;

   SDL_ATinit( "SDL_Surface" );

   /* Initializes the SDL subsystems. */
   SDL_Init(0);

   SDL_ATbegin( "Creating Testsurface" );
   /* Create the test surface. */
   testsur = SDL_CreateRGBSurface( 0, 80, 60, 32, 
         RMASK, GMASK, BMASK, AMASK );
   if (SDL_ATassert( "SDL_CreateRGBSurface", testsur != NULL))
      return -1;
   SDL_ATend();

   /* Software blitting. */
   surface_testLoad( testsur );
   surface_testPrimitives( testsur );
   surface_testPrimitivesBlend( testsur );
   surface_testBlit( testsur );
   surface_testBlitBlend( testsur );

   /* Clean up. */
   SDL_FreeSurface( testsur );

   /* Exit SDL. */
   SDL_Quit();

   return SDL_ATfinish(1);
}