Atlas - SDL_render_ops.cpp
Home / ext / SDL / src / render / ngage
Lines: 1 | Size: 5023 bytes
[Download] [Show on GitHub] [Search similar files] [Raw] [Raw (proxy)] 
[FILE BEGIN]
1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2025 Sam Lantinga <[email protected]>
4
5  This software is provided 'as-is', without any express or implied
6  warranty.  In no event will the authors be held liable for any damages
7  arising from the use of this software.
8
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12
13  1. The origin of this software must not be misrepresented; you must not
14     claim that you wrote the original software. If you use this software
15     in a product, an acknowledgment in the product documentation would be
16     appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18     misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20*/
21#include "SDL_internal.h"
22
23#include <3dtypes.h>
24#include "SDL_render_ops.hpp"
25
26void ApplyColorMod(void *dest, void *source, int pitch, int width, int height, SDL_FColor color)
27{
28    TUint16 *src_pixels = static_cast<TUint16 *>(source);
29    TUint16 *dst_pixels = static_cast<TUint16 *>(dest);
30
31    TFixed rf = Real2Fix(color.r);
32    TFixed gf = Real2Fix(color.g);
33    TFixed bf = Real2Fix(color.b);
34
35    for (int y = 0; y < height; ++y)
36    {
37        for (int x = 0; x < width; ++x)
38        {
39            TUint16 pixel = src_pixels[y * pitch / 2 + x];
40            TUint8 r = (pixel & 0xF800) >> 8;
41            TUint8 g = (pixel & 0x07E0) >> 3;
42            TUint8 b = (pixel & 0x001F) << 3;
43            r = FixMul(r, rf);
44            g = FixMul(g, gf);
45            b = FixMul(b, bf);
46            dst_pixels[y * pitch / 2 + x] = (r << 8) | (g << 3) | (b >> 3);
47        }
48    }
49}
50
51void ApplyFlip(void *dest, void *source, int pitch, int width, int height, SDL_FlipMode flip)
52{
53    TUint16 *src_pixels = static_cast<TUint16 *>(source);
54    TUint16 *dst_pixels = static_cast<TUint16 *>(dest);
55
56    for (int y = 0; y < height; ++y)
57    {
58        for (int x = 0; x < width; ++x)
59        {
60            int src_x = x;
61            int src_y = y;
62
63            if (flip & SDL_FLIP_HORIZONTAL)
64            {
65                src_x = width - 1 - x;
66            }
67
68            if (flip & SDL_FLIP_VERTICAL)
69            {
70                src_y = height - 1 - y;
71            }
72
73            dst_pixels[y * pitch / 2 + x] = src_pixels[src_y * pitch / 2 + src_x];
74        }
75    }
76}
77
78void ApplyRotation(void *dest, void *source, int pitch, int width, int height, TFixed center_x, TFixed center_y, TFixed angle)
79{
80    TUint16 *src_pixels = static_cast<TUint16 *>(source);
81    TUint16 *dst_pixels = static_cast<TUint16 *>(dest);
82
83    TFixed cos_angle = 0;
84    TFixed sin_angle = 0;
85
86    if (angle != 0)
87    {
88        FixSinCos(angle, sin_angle, cos_angle);
89    }
90
91    for (int y = 0; y < height; ++y)
92    {
93        for (int x = 0; x < width; ++x)
94        {
95            // Translate point to origin.
96            TFixed translated_x = Int2Fix(x) - center_x;
97            TFixed translated_y = Int2Fix(y) - center_y;
98
99            // Rotate point (clockwise).
100            TFixed rotated_x = FixMul(translated_x, cos_angle) + FixMul(translated_y, sin_angle);
101            TFixed rotated_y = FixMul(translated_y, cos_angle) - FixMul(translated_x, sin_angle);
102
103            // Translate point back.
104            int final_x = Fix2Int(rotated_x + center_x);
105            int final_y = Fix2Int(rotated_y + center_y);
106
107            // Check bounds.
108            if (final_x >= 0 && final_x < width && final_y >= 0 && final_y < height)
109            {
110                dst_pixels[y * pitch / 2 + x] = src_pixels[final_y * pitch / 2 + final_x];
111            }
112            else
113            {
114                dst_pixels[y * pitch / 2 + x] = 0;
115            }
116        }
117    }
118}
119
120void ApplyScale(void *dest, void *source, int pitch, int width, int height, TFixed center_x, TFixed center_y, TFixed scale_x, TFixed scale_y)
121{
122    TUint16 *src_pixels = static_cast<TUint16 *>(source);
123    TUint16 *dst_pixels = static_cast<TUint16 *>(dest);
124
125    for (int y = 0; y < height; ++y)
126    {
127        for (int x = 0; x < width; ++x)
128        {
129            // Translate point to origin.
130            TFixed translated_x = Int2Fix(x) - center_x;
131            TFixed translated_y = Int2Fix(y) - center_y;
132
133            // Scale point.
134            TFixed scaled_x = FixDiv(translated_x, scale_x);
135            TFixed scaled_y = FixDiv(translated_y, scale_y);
136
137            // Translate point back.
138            int final_x = Fix2Int(scaled_x + center_x);
139            int final_y = Fix2Int(scaled_y + center_y);
140
141            // Check bounds.
142            if (final_x >= 0 && final_x < width && final_y >= 0 && final_y < height)
143            {
144                dst_pixels[y * pitch / 2 + x] = src_pixels[final_y * pitch / 2 + final_x];
145            }
146            else
147            {
148                dst_pixels[y * pitch / 2 + x] = 0;
149            }
150        }
151    }
152}
153
[FILE END]
(C) 2025 0x4248
(C) 2025 4248 Media and 4248 Systems, All part of 0x4248
See LICENCE files for more information. Not all files are by 0x4248 always check Licencing.