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Screen Shift
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| void ShiftUp(unsigned amt) { | |
| char *dst = currDrawingBuff + xmin + ymin * lcdWidth; | |
| char *src = dst + amt * lcdWidth; | |
| unsigned times = ymax - ymin - amt; | |
| do { | |
| ldir(dst, src, xmax - xmin); | |
| dst += lcdWidth; | |
| src += lcdWidth; | |
| } while (--times); | |
| } | |
| void ShiftDown(unsigned amt) { | |
| char *dst = currDrawingBuff + (xmax - 1) + (ymax - 1) * lcdWidth; | |
| char *src = dst - amt * lcdWidth; | |
| unsigned times = ymax - ymin - amt; | |
| do { | |
| lddr(dst, src, xmax - xmin); | |
| dst -= lcdWidth; | |
| src -= lcdWidth; | |
| } while (--times); | |
| } | |
| void ShiftLeft(unsigned amt) { | |
| char *dst = currDrawingBuff + xmin + ymin * lcdWidth; | |
| char *src = dst + amt; | |
| unsigned times = ymax - ymin; | |
| do { | |
| ldir(dst, src, xmax - xmin - amt); | |
| dst += lcdWidth; | |
| src += lcdWidth; | |
| } while (--times); | |
| } | |
| void ShiftRight(unsigned amt) { | |
| char *dst = currDrawingBuff + (xmax - 1) + (ymax - 1) * lcdWidth; | |
| char *src = dst - amt; | |
| unsigned times = ymax - ymin; | |
| do { | |
| lddr(dst, src, xmax - xmin - amt); | |
| dst -= lcdWidth; | |
| src -= lcdWidth; | |
| } while (--times); | |
| } |
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