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sent-bilinearscaling-1.0.diff - sites - public wiki contents of suckless.org |
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sent-bilinearscaling-1.0.diff (2979B) |
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1 diff --git a/sent.c b/sent.c |
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2 index 0da2bff..d92cf3b 100644 |
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3 --- a/sent.c |
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4 +++ b/sent.c |
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5 @@ -282,27 +282,66 @@ ffprepare(Image *img) |
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6 img->state |= SCALED; |
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7 } |
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8 |
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9 +static unsigned char double_to_uchar_clamp255(double dbl) |
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10 +{ |
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11 + dbl = round(dbl); |
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12 + |
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13 + return |
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14 + (dbl < 0.0) ? 0 : |
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15 + (dbl > 255.0) ? 255 : (unsigned char)dbl; |
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16 +} |
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17 + |
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18 +static int int_clamp(int integer, int lower, int upper) |
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19 +{ |
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20 + if (integer < lower) |
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21 + return lower; |
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22 + else if (integer >= upper) |
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23 + return upper - 1; |
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24 + else |
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25 + return integer; |
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26 +} |
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27 + |
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28 void |
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29 ffscale(Image *img) |
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30 { |
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31 - unsigned int x, y; |
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32 - unsigned int width = img->ximg->width; |
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33 - unsigned int height = img->ximg->height; |
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34 - char* newBuf = img->ximg->data; |
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35 - unsigned char* ibuf; |
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36 - unsigned int jdy = img->ximg->bytes_per_line / 4 - width; |
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37 - unsigned int dx = (img->bufwidth << 10) / width; |
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38 - |
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39 - for (y = 0; y < height; y++) { |
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40 - unsigned int bufx = img->bufwidth / width; |
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41 - ibuf = &img->buf[y * img->bufheight / height * img->buf… |
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42 - |
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43 - for (x = 0; x < width; x++) { |
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44 - *newBuf++ = (ibuf[(bufx >> 10)*3+2]); |
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45 - *newBuf++ = (ibuf[(bufx >> 10)*3+1]); |
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46 - *newBuf++ = (ibuf[(bufx >> 10)*3+0]); |
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47 + const unsigned width = img->ximg->width; |
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48 + const unsigned height = img->ximg->height; |
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49 + unsigned char* newBuf = (unsigned char*)img->ximg->data; |
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50 + const unsigned jdy = img->ximg->bytes_per_line / 4 - width; |
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51 + |
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52 + const double x_scale = ((double)img->bufwidth/(double)width); |
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53 + const double y_scale = ((double)img->bufheight/(double)height); |
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54 + |
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55 + for (unsigned y = 0; y < height; ++y) { |
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56 + const double old_y = (double)y * y_scale; |
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57 + const double y_factor = ceil(old_y) - old_y; |
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58 + const int old_y_int_0 = int_clamp((int)floor(old_y), 0,… |
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59 + const int old_y_int_1 = int_clamp((int)ceil(old_y), 0, … |
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60 + |
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61 + for (unsigned x = 0; x < width; ++x) { |
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62 + const double old_x = (double)x * x_scale; |
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63 + const double x_factor = ceil(old_x) - old_x; |
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64 + const int old_x_int_0 = int_clamp((int)floor(ol… |
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65 + const int old_x_int_1 = int_clamp((int)ceil(old… |
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66 + |
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67 + const unsigned c00_pos = 3*((old_x_int_0) + ((o… |
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68 + const unsigned c01_pos = 3*((old_x_int_0) + ((o… |
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69 + const unsigned c10_pos = 3*((old_x_int_1) + ((o… |
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70 + const unsigned c11_pos = 3*((old_x_int_1) + ((o… |
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71 + |
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72 + for (int i = 2; i >= 0 ; --i) { |
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73 + const unsigned char c00 = img->buf[c00_… |
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74 + const unsigned char c01 = img->buf[c01_… |
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75 + const unsigned char c10 = img->buf[c10_… |
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76 + const unsigned char c11 = img->buf[c11_… |
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77 + |
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78 + const double x_result_0 = (double)c00*x… |
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79 + const double x_result_1 = (double)c01*x… |
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80 + const double result = x_result_0*y_fact… |
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81 + |
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82 + *newBuf++ = double_to_uchar_clamp255(re… |
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83 + } |
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84 newBuf++; |
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85 - bufx += dx; |
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86 } |
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87 newBuf += jdy; |
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88 } |
