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1 #include "../stdafx.h" |
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2 #include "../gfx.h" |
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3 #include "../fileio.h" |
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4 #include "../debug.h" |
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5 #include "grf.hpp" |
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6 |
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7 bool SpriteLoaderGrf::LoadSprite(SpriteLoader::Sprite *sprite, uint32 file_pos) |
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8 { |
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9 /* Open the right file and go to the correct position */ |
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10 FioSeekToFile(file_pos); |
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11 |
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12 /* Read the size and type */ |
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13 int num = FioReadWord(); |
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14 byte type = FioReadByte(); |
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15 |
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16 /* Type 0xFF indicates either a colormap or some other non-sprite info; we do not handle them here */ |
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17 if (type == 0xFF) return false; |
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18 |
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19 sprite->height = FioReadByte(); |
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20 sprite->width = FioReadWord(); |
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21 sprite->x_offs = FioReadWord(); |
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22 sprite->y_offs = FioReadWord(); |
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23 |
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24 /* 0x02 indicates it is a compressed sprite, so we can't rely on 'num' to be valid. |
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25 * In case it is uncompressed, the size is 'num' - 8 (header-size). */ |
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26 num = (type & 0x02) ? sprite->width * sprite->height : num - 8; |
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27 |
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28 /* XXX -- We should use a pre-located memory segment for this, malloc/free is pretty expensive */ |
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29 byte *dest_orig = MallocT<byte>(num); |
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30 byte *dest = dest_orig; |
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31 |
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32 /* Read the file, which has some kind of compression */ |
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33 while (num > 0) { |
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34 int8 code = FioReadByte(); |
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35 |
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36 if (code >= 0) { |
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37 /* Plain bytes to read */ |
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38 int size = (code == 0) ? 0x80 : code; |
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39 num -= size; |
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40 for (; size > 0; size--) { |
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41 *dest = FioReadByte(); |
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42 dest++; |
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43 } |
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44 } else { |
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45 /* Copy bytes from earlier in the sprite */ |
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46 const uint data_offset = ((code & 7) << 8) | FioReadByte(); |
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47 int size = -(code >> 3); |
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48 num -= size; |
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49 for (; size > 0; size--) { |
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50 *dest = *(dest - data_offset); |
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51 dest++; |
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52 } |
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53 } |
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54 } |
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55 |
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56 assert(num == 0); |
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57 |
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58 sprite->data = CallocT<SpriteLoader::CommonPixel>(sprite->width * sprite->height); |
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59 |
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60 /* When there are transparency pixels, this format has an other trick.. decode it */ |
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61 if (type & 0x08) { |
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62 for (int y = 0; y < sprite->height; y++) { |
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63 bool last_item = false; |
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64 /* Look up in the header-table where the real data is stored for this row */ |
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65 int offset = (dest_orig[y * 2 + 1] << 8) | dest_orig[y * 2]; |
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66 /* Go to that row */ |
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67 dest = &dest_orig[offset]; |
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68 |
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69 do { |
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70 SpriteLoader::CommonPixel *data; |
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71 /* Read the header: |
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72 * 0 .. 14 - length |
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73 * 15 - last_item |
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74 * 16 .. 31 - transparency bytes */ |
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75 last_item = ((*dest) & 0x80) != 0; |
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76 int length = (*dest++) & 0x7F; |
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77 int skip = *dest++; |
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78 |
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79 data = &sprite->data[y * sprite->width + skip]; |
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80 |
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81 for (int x = 0; x < length; x++) { |
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82 data->m = *dest; |
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83 dest++; |
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84 data++; |
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85 } |
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86 } while (!last_item); |
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87 } |
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88 } else { |
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89 dest = dest_orig; |
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90 for (int i = 0; i < sprite->width * sprite->height; i++) |
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91 sprite->data[i].m = dest[i]; |
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92 } |
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93 |
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94 free(dest_orig); |
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95 return true; |
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96 } |