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88 lines
3.0 KiB
C
88 lines
3.0 KiB
C
/*
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* This file is part of Espruino, a JavaScript interpreter for Microcontrollers
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*
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* Copyright (C) 2013 Gordon Williams <gw@pur3.co.uk>
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* ----------------------------------------------------------------------------
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* Graphics Backend for drawing to ArrayBuffer
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* ----------------------------------------------------------------------------
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*/
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#include "jswrap_arraybuffer.h"
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#include "lcd_arraybuffer.h"
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#include "jsvar.h"
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int lcdGetPixelIndex_ArrayBuffer(JsGraphics *gfx, short x, short y) {
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if (gfx->data.flags & JSGRAPHICSFLAGS_ARRAYBUFFER_ZIGZAG) {
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if (y&1) x = gfx->data.width-(1+x);
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}
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if (gfx->data.flags & JSGRAPHICSFLAGS_ARRAYBUFFER_VERTICAL_BYTE)
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return ((x + (y>>3)*gfx->data.width)<<3) | (y&7);
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else
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return (x + y*gfx->data.width)*gfx->data.bpp;
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}
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unsigned int lcdGetPixel_ArrayBuffer(JsGraphics *gfx, short x, short y) {
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unsigned int col = 0;
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JsVar *buf = jsvSkipNameAndUnLock(jsvFindChildFromString(gfx->graphicsVar, "buffer", false));
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if (buf && jsvIsArrayBuffer(buf)) {
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int idx = lcdGetPixelIndex_ArrayBuffer(gfx,x,y);
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JsvArrayBufferIterator it;
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jsvArrayBufferIteratorNew(&it, buf, idx>>3 );
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if (gfx->data.bpp < 8) {
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idx = idx & 7;
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int mask = (1<<gfx->data.bpp)-1;
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int existing = jsvArrayBufferIteratorGetIntegerValue(&it);
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col = (existing>>idx)&mask;
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} else {
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int i;
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for (i=0;i<gfx->data.bpp;i+=8) {
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col |= jsvArrayBufferIteratorGetIntegerValue(&it)<<i;
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jsvArrayBufferIteratorNext(&it);
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}
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}
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jsvArrayBufferIteratorFree(&it);
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}
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return col;
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}
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void lcdSetPixel_ArrayBuffer(JsGraphics *gfx, short x, short y, unsigned int col) {
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JsVar *buf = jsvSkipNameAndUnLock(jsvFindChildFromString(gfx->graphicsVar, "buffer", false));
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if (buf && jsvIsArrayBuffer(buf)) {
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int idx = lcdGetPixelIndex_ArrayBuffer(gfx,x,y);
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JsvArrayBufferIterator it;
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jsvArrayBufferIteratorNew(&it, buf, idx>>3 );
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if (gfx->data.bpp < 8) {
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idx = idx & 7;
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int mask = (1<<gfx->data.bpp)-1;
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int existing = jsvArrayBufferIteratorGetIntegerValue(&it);
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jsvArrayBufferIteratorSetIntegerValue(&it, (existing&~(mask<<idx)) | ((col&mask)<<idx));
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} else {
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int i;
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for (i=0;i<gfx->data.bpp;i+=8) {
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jsvArrayBufferIteratorSetIntegerValue(&it, col >> i);
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jsvArrayBufferIteratorNext(&it);
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}
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}
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jsvArrayBufferIteratorFree(&it);
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jsvUnLock(buf);
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}
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}
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void lcdInit_ArrayBuffer(JsGraphics *gfx) {
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// create buffer
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JsVar *buf = jswrap_arraybuffer_constructor(gfx->data.width * gfx->data.height * gfx->data.bpp / 8);
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jsvAddNamedChild(gfx->graphicsVar, buf, "buffer");
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jsvUnLock(buf);
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}
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void lcdSetCallbacks_ArrayBuffer(JsGraphics *gfx) {
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gfx->setPixel = lcdSetPixel_ArrayBuffer;
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gfx->getPixel = lcdGetPixel_ArrayBuffer;
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// TODO: Optimised fill?
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}
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