| 1 | // This is part of Pico Library\r |
| 2 | \r |
| 3 | // (c) Copyright 2004 Dave, All rights reserved.\r |
| 4 | // (c) Copyright 2006 notaz, All rights reserved.\r |
| 5 | // Free for non-commercial use.\r |
| 6 | \r |
| 7 | // For commercial use, separate licencing terms must be obtained.\r |
| 8 | \r |
| 9 | \r |
| 10 | #include "pico_int.h"\r |
| 11 | \r |
| 12 | int PicuAnd=0xf7de;\r |
| 13 | \r |
| 14 | // Quick low-quality conversion of 320 to 176:\r |
| 15 | int PicuQuick(unsigned short *dest,unsigned short *src)\r |
| 16 | {\r |
| 17 | unsigned short *end=NULL;\r |
| 18 | \r |
| 19 | src+=13; end=src+290;\r |
| 20 | dest++;\r |
| 21 | \r |
| 22 | do\r |
| 23 | {\r |
| 24 | *dest++=*src++;\r |
| 25 | *dest++=*src; src+=2;\r |
| 26 | *dest++=*src; src+=2;\r |
| 27 | *dest++=*src++;\r |
| 28 | *dest++=*src; src+=2;\r |
| 29 | *dest++=*src; src+=2;\r |
| 30 | }\r |
| 31 | while (src<end);\r |
| 32 | \r |
| 33 | return 0;\r |
| 34 | }\r |
| 35 | \r |
| 36 | // Shrink the pixels in src/srcLen, to the screen line pointed to by dest/destLen\r |
| 37 | int PicuShrink(unsigned short *dest,int destLen,unsigned short *src,int srcLen)\r |
| 38 | {\r |
| 39 | unsigned short *end=NULL;\r |
| 40 | int bias=0,pa=0,sub=0;\r |
| 41 | \r |
| 42 | end=dest+destLen;\r |
| 43 | sub=srcLen-destLen;\r |
| 44 | \r |
| 45 | do\r |
| 46 | {\r |
| 47 | pa=*src++; bias-=sub;\r |
| 48 | if (bias<0) { pa+=*src++; pa>>=1; bias+=destLen; }\r |
| 49 | *dest++=(unsigned short)pa;\r |
| 50 | \r |
| 51 | pa=*src++; bias-=sub;\r |
| 52 | if (bias<0) { pa+=*src++; pa>>=1; bias+=destLen; }\r |
| 53 | *dest++=(unsigned short)pa;\r |
| 54 | }\r |
| 55 | while (dest<end);\r |
| 56 | \r |
| 57 | return 0;\r |
| 58 | }\r |
| 59 | \r |
| 60 | // same thing, only reversed (dest is in pre-decremental mode)\r |
| 61 | int PicuShrinkReverse(unsigned short *dest,int destLen,unsigned short *src,int srcLen)\r |
| 62 | {\r |
| 63 | unsigned short *end=NULL;\r |
| 64 | int bias=0,pa=0,sub=0;\r |
| 65 | \r |
| 66 | end=dest-destLen;\r |
| 67 | sub=srcLen-destLen;\r |
| 68 | \r |
| 69 | do\r |
| 70 | {\r |
| 71 | pa=*src++; bias-=sub;\r |
| 72 | if (bias<0) { pa+=*src++; pa>>=1; bias+=destLen; }\r |
| 73 | *(--dest)=(unsigned short)pa;\r |
| 74 | \r |
| 75 | pa=*src++; bias-=sub;\r |
| 76 | if (bias<0) { pa+=*src++; pa>>=1; bias+=destLen; }\r |
| 77 | *(--dest)=(unsigned short)pa;\r |
| 78 | }\r |
| 79 | while (dest>end);\r |
| 80 | \r |
| 81 | return 0;\r |
| 82 | }\r |
| 83 | \r |
| 84 | int PicuMerge(unsigned short *dest,int destLen,unsigned short *src,int srcLen)\r |
| 85 | {\r |
| 86 | unsigned short *end=NULL;\r |
| 87 | int bias=0,pa=0,mask=PicuAnd,sub=0;\r |
| 88 | \r |
| 89 | end=dest+destLen;\r |
| 90 | sub=srcLen-destLen;\r |
| 91 | \r |
| 92 | do\r |
| 93 | {\r |
| 94 | pa=*src++; bias-=sub;\r |
| 95 | if (bias<0) { pa+=*src++; pa>>=1; bias+=destLen; }\r |
| 96 | pa&=mask; pa+=(*dest)&mask; pa>>=1;\r |
| 97 | *dest++=(unsigned short)pa;\r |
| 98 | \r |
| 99 | pa=*src++; bias-=sub;\r |
| 100 | if (bias<0) { pa+=*src++; pa>>=1; bias+=destLen; }\r |
| 101 | pa&=mask; pa+=(*dest)&mask; pa>>=1;\r |
| 102 | *dest++=(unsigned short)pa;\r |
| 103 | }\r |
| 104 | while (dest<end);\r |
| 105 | \r |
| 106 | return 0;\r |
| 107 | }\r |
| 108 | \r |