/*

  Simple DirectMedia Layer

  Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>

​

  This software is provided 'as-is', without any express or implied

  warranty.  In no event will the authors be held liable for any damages

  arising from the use of this software.

​

  Permission is granted to anyone to use this software for any purpose,

  including commercial applications, and to alter it and redistribute it

  freely, subject to the following restrictions:

​

  1. The origin of this software must not be misrepresented; you must not

     claim that you wrote the original software. If you use this software

     in a product, an acknowledgment in the product documentation would be

     appreciated but is not required.

  2. Altered source versions must be plainly marked as such, and must not be

     misrepresented as being the original software.

  3. This notice may not be removed or altered from any source distribution.

*/

#include "SDL_internal.h"

​

#if SDL_VIDEO_RENDER_SW

​

#include "SDL_draw.h"

#include "SDL_blendline.h"

#include "SDL_blendpoint.h"

​

static void SDL_BlendLine_RGB2(SDL_Surface *dst, int x1, int y1, int x2, int y2,

                               SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,

                               SDL_bool draw_end)

{

    const SDL_PixelFormat *fmt = dst->format;

    unsigned r, g, b, a, inva;

​

    if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {

        r = DRAW_MUL(_r, _a);

        g = DRAW_MUL(_g, _a);

        b = DRAW_MUL(_b, _a);

        a = _a;

    } else {

        r = _r;

        g = _g;

        b = _b;

        a = _a;

    }

    inva = (a ^ 0xff);

​

    if (y1 == y2) {

        switch (blendMode) {

        case SDL_BLENDMODE_BLEND:

            HLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB, draw_end);

            break;

        case SDL_BLENDMODE_ADD:

            HLINE(Uint16, DRAW_SETPIXEL_ADD_RGB, draw_end);

            break;

        case SDL_BLENDMODE_MOD:

            HLINE(Uint16, DRAW_SETPIXEL_MOD_RGB, draw_end);

            break;

        case SDL_BLENDMODE_MUL:

            HLINE(Uint16, DRAW_SETPIXEL_MUL_RGB, draw_end);

            break;

        default:

            HLINE(Uint16, DRAW_SETPIXEL_RGB, draw_end);

            break;

        }

    } else if (x1 == x2) {

        switch (blendMode) {

        case SDL_BLENDMODE_BLEND:

            VLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB, draw_end);

            break;

        case SDL_BLENDMODE_ADD:

            VLINE(Uint16, DRAW_SETPIXEL_ADD_RGB, draw_end);

            break;

        case SDL_BLENDMODE_MOD:

            VLINE(Uint16, DRAW_SETPIXEL_MOD_RGB, draw_end);

            break;

        case SDL_BLENDMODE_MUL:

            VLINE(Uint16, DRAW_SETPIXEL_MUL_RGB, draw_end);

            break;

        default:

            VLINE(Uint16, DRAW_SETPIXEL_RGB, draw_end);

            break;

        }

    } else if (ABS(x1 - x2) == ABS(y1 - y2)) {

        switch (blendMode) {

        case SDL_BLENDMODE_BLEND:

            DLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB, draw_end);

            break;

        case SDL_BLENDMODE_ADD:

            DLINE(Uint16, DRAW_SETPIXEL_ADD_RGB, draw_end);

            break;

        case SDL_BLENDMODE_MOD:

            DLINE(Uint16, DRAW_SETPIXEL_MOD_RGB, draw_end);

            break;

        case SDL_BLENDMODE_MUL:

            DLINE(Uint16, DRAW_SETPIXEL_MUL_RGB, draw_end);

            break;

        default:

            DLINE(Uint16, DRAW_SETPIXEL_RGB, draw_end);

            break;

        }

    } else {

        switch (blendMode) {

        case SDL_BLENDMODE_BLEND:

            AALINE(x1, y1, x2, y2,

                   DRAW_SETPIXELXY2_BLEND_RGB, DRAW_SETPIXELXY2_BLEND_RGB,

                   draw_end);

            break;

        case SDL_BLENDMODE_ADD:

            AALINE(x1, y1, x2, y2,

                   DRAW_SETPIXELXY2_ADD_RGB, DRAW_SETPIXELXY2_ADD_RGB,

                   draw_end);

            break;

        case SDL_BLENDMODE_MOD:

            AALINE(x1, y1, x2, y2,

                   DRAW_SETPIXELXY2_MOD_RGB, DRAW_SETPIXELXY2_MOD_RGB,

                   draw_end);

            break;