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/*
* This file is part of Espruino, a JavaScript interpreter for Microcontrollers
*
* Copyright (C) 2013 Gordon Williams <gw@pur3.co.uk>
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* ----------------------------------------------------------------------------
* Graphics Draw Functions
* ----------------------------------------------------------------------------
*/
#include "graphics.h"
#include "bitmap_font_4x6.h"
#ifndef NO_VECTOR_FONT
#include "vector_font.h"
#endif
#include "jsutils.h"
#include "jsvar.h"
#include "jsparse.h"
#include "lcd_arraybuffer.h"
#include "lcd_js.h"
#ifdef USE_LCD_SDL
#include "lcd_sdl.h"
#endif
#ifdef USE_LCD_FSMC
#include "lcd_fsmc.h"
#endif
#ifdef USE_LCD_SPI
#include "lcd_spilcd.h"
#endif
#ifdef USE_LCD_ST7789_8BIT
#include "lcd_st7789_8bit.h"
#endif
// ----------------------------------------------------------------------------------------------
static void graphicsSetPixelDevice(JsGraphics *gfx, int x, int y, unsigned int col);
void graphicsFallbackSetPixel(JsGraphics *gfx, int x, int y, unsigned int col) {
NOT_USED(gfx);
NOT_USED(x);
NOT_USED(y);
NOT_USED(col);
}
unsigned int graphicsFallbackGetPixel(JsGraphics *gfx, int x, int y) {
NOT_USED(gfx);
NOT_USED(x);
NOT_USED(y);
return 0;
}
void graphicsFallbackFillRect(JsGraphics *gfx, int x1, int y1, int x2, int y2, unsigned int col) {
int x,y;
for (y=y1;y<=y2;y++)
for (x=x1;x<=x2;x++)
graphicsSetPixelDevice(gfx,x,y, col);
}
void graphicsFallbackScrollX(JsGraphics *gfx, int xdir, int yfrom, int yto) {
int x;
if (xdir<=0) {
int w = gfx->data.width+xdir;
for (x=0;x<w;x++)
gfx->setPixel(gfx, (int)x,(int)yto,
gfx->getPixel(gfx, (int)(x-xdir),(int)yfrom));
} else { // >0
for (x=gfx->data.width-xdir-1;x>=0;x--)
gfx->setPixel(gfx, (int)(x+xdir),(int)yto,
gfx->getPixel(gfx, (int)x,(int)yfrom));
}
}
void graphicsFallbackScroll(JsGraphics *gfx, int xdir, int ydir) {
if (xdir==0 && ydir==0) return;
int y;
if (ydir<=0) {
int h = gfx->data.height+ydir;
for (y=0;y<h;y++)
graphicsFallbackScrollX(gfx, xdir, y-ydir, y);
} else { // >0
for (y=gfx->data.height-ydir-1;y>=0;y--)
graphicsFallbackScrollX(gfx, xdir, y, y+ydir);
}
#ifndef SAVE_ON_FLASH
gfx->data.modMinX=0;
gfx->data.modMinY=0;
gfx->data.modMaxX=(short)(gfx->data.width-1);
gfx->data.modMaxY=(short)(gfx->data.height-1);
#endif
}
// ----------------------------------------------------------------------------------------------
void graphicsStructResetState(JsGraphics *gfx) {
gfx->data.fgColor = 0xFFFFFFFF;
gfx->data.bgColor = 0;
gfx->data.fontSize = 1+JSGRAPHICS_FONTSIZE_4X6;
#ifndef SAVE_ON_FLASH
gfx->data.fontAlignX = 3;
gfx->data.fontAlignY = 3;
gfx->data.fontRotate = 0;
gfx->data.clipRect.x1 = 0;
gfx->data.clipRect.y1 = 0;
gfx->data.clipRect.x2 = (unsigned short)(gfx->data.width-1);
gfx->data.clipRect.y2 = (unsigned short)(gfx->data.height-1);
#endif
gfx->data.cursorX = 0;
gfx->data.cursorY = 0;
}
void graphicsStructInit(JsGraphics *gfx, int width, int height, int bpp) {
// type/width/height/bpp should be set elsewhere...
gfx->data.flags = JSGRAPHICSFLAGS_NONE;
gfx->data.width = (unsigned short)width;
gfx->data.height = (unsigned short)height;
gfx->data.bpp = (unsigned char)bpp;
graphicsStructResetState(gfx);
#ifndef SAVE_ON_FLASH
gfx->data.modMaxX = -32768;
gfx->data.modMaxY = -32768;
gfx->data.modMinX = 32767;
gfx->data.modMinY = 32767;
#endif
}
bool graphicsGetFromVar(JsGraphics *gfx, JsVar *parent) {
gfx->graphicsVar = parent;
JsVar *data = jsvObjectGetChild(parent, JS_HIDDEN_CHAR_STR"gfx", 0);
assert(data);
if (data) {
jsvGetString(data, (char*)&gfx->data, sizeof(JsGraphicsData)+1/*trailing zero*/);
jsvUnLock(data);
gfx->setPixel = graphicsFallbackSetPixel;
gfx->getPixel = graphicsFallbackGetPixel;
gfx->fillRect = graphicsFallbackFillRect;
gfx->scroll = graphicsFallbackScroll;
#ifdef USE_LCD_SDL
if (gfx->data.type == JSGRAPHICSTYPE_SDL) {
lcdSetCallbacks_SDL(gfx);
} else
#endif
#ifdef USE_LCD_FSMC
if (gfx->data.type == JSGRAPHICSTYPE_FSMC) {
lcdSetCallbacks_FSMC(gfx);
} else
#endif
if (gfx->data.type == JSGRAPHICSTYPE_ARRAYBUFFER) {
lcdSetCallbacks_ArrayBuffer(gfx);
#ifndef SAVE_ON_FLASH
} else if (gfx->data.type == JSGRAPHICSTYPE_JS) {
lcdSetCallbacks_JS(gfx);
#endif
#ifdef USE_LCD_SPI
} else if (gfx->data.type == JSGRAPHICSTYPE_SPILCD) {
lcdSetCallbacks_SPILCD(gfx);
#endif
#ifdef USE_LCD_ST7789_8BIT
} else if (gfx->data.type == JSGRAPHICSTYPE_ST7789_8BIT) {
lcdST7789_setCallbacks(gfx);
#endif
} else {
jsExceptionHere(JSET_INTERNALERROR, "Unknown graphics type\n");
assert(0);
}
return true;
} else
return false;
}
void graphicsSetVar(JsGraphics *gfx) {
JsVar *dataname = jsvFindChildFromString(gfx->graphicsVar, JS_HIDDEN_CHAR_STR"gfx", true);
JsVar *data = jsvSkipName(dataname);
if (!data) {
data = jsvNewStringOfLength(sizeof(JsGraphicsData), NULL);
jsvSetValueOfName(dataname, data);
}
jsvUnLock(dataname);
assert(data);
jsvSetString(data, (char*)&gfx->data, sizeof(JsGraphicsData));
jsvUnLock(data);
}
/// Get the memory requires for this graphics's pixels if everything was packed as densely as possible
size_t graphicsGetMemoryRequired(const JsGraphics *gfx) {
return (size_t)(gfx->data.width * gfx->data.height * gfx->data.bpp + 7) >> 3;
};
// ----------------------------------------------------------------------------------------------
// If graphics is flipped or rotated then the coordinates need modifying
void graphicsToDeviceCoordinates(const JsGraphics *gfx, int *x, int *y) {
if (gfx->data.flags & JSGRAPHICSFLAGS_SWAP_XY) {
int t = *x;
*x = *y;
*y = t;
}
if (gfx->data.flags & JSGRAPHICSFLAGS_INVERT_X) *x = (int)(gfx->data.width - (*x+1));
if (gfx->data.flags & JSGRAPHICSFLAGS_INVERT_Y) *y = (int)(gfx->data.height - (*y+1));
}
// ----------------------------------------------------------------------------------------------
static void graphicsSetPixelDevice(JsGraphics *gfx, int x, int y, unsigned int col) {
#ifdef SAVE_ON_FLASH
if (x<0 || y<0 || x>=gfx->data.width || y>=gfx->data.height) return;
#else
if (x<gfx->data.clipRect.x1 ||
y<gfx->data.clipRect.y1 ||
x>gfx->data.clipRect.x2 ||
y>gfx->data.clipRect.y2) return;
#endif
#ifndef SAVE_ON_FLASH
if (x < gfx->data.modMinX) gfx->data.modMinX=(short)x;
if (x > gfx->data.modMaxX) gfx->data.modMaxX=(short)x;
if (y < gfx->data.modMinY) gfx->data.modMinY=(short)y;
if (y > gfx->data.modMaxY) gfx->data.modMaxY=(short)y;
#endif
gfx->setPixel(gfx,(int)x,(int)y,col & (unsigned int)((1L<<gfx->data.bpp)-1));
}
static unsigned int graphicsGetPixelDevice(JsGraphics *gfx, int x, int y) {
if (x<0 || y<0 || x>=gfx->data.width || y>=gfx->data.height) return 0;
return gfx->getPixel(gfx, x, y);
}
static void graphicsFillRectDevice(JsGraphics *gfx, int x1, int y1, int x2, int y2, unsigned int col) {
if (x1>x2) {
int t = x1;
x1 = x2;
x2 = t;
}
if (y1>y2) {
int t = y1;
y1 = y2;
y2 = t;
}
#ifdef SAVE_ON_FLASH
if (x1<0) x1 = 0;
if (y1<0) y1 = 0;
if (x2>=gfx->data.width) x2 = gfx->data.width - 1;
if (y2>=gfx->data.height) y2 = gfx->data.height - 1;
#else
if (x1<gfx->data.clipRect.x1) x1 = gfx->data.clipRect.x1;
if (y1<gfx->data.clipRect.y1) y1 = gfx->data.clipRect.y1;
if (x2>gfx->data.clipRect.x2) x2 = gfx->data.clipRect.x2;
if (y2>gfx->data.clipRect.y2) y2 = gfx->data.clipRect.y2;
#endif
if (x2<x1 || y2<y1) return; // nope
#ifndef SAVE_ON_FLASH
if (x1 < gfx->data.modMinX) gfx->data.modMinX=(short)x1;
if (x2 > gfx->data.modMaxX) gfx->data.modMaxX=(short)x2;
if (y1 < gfx->data.modMinY) gfx->data.modMinY=(short)y1;
if (y2 > gfx->data.modMaxY) gfx->data.modMaxY=(short)y2;
#endif
if (x1==x2 && y1==y2) {
gfx->setPixel(gfx,(int)x1,(int)y1,col);
return;
}
return gfx->fillRect(gfx, (int)x1, (int)y1, (int)x2, (int)y2, col);
}
// ----------------------------------------------------------------------------------------------
void graphicsSetPixel(JsGraphics *gfx, int x, int y, unsigned int col) {
graphicsToDeviceCoordinates(gfx, &x, &y);
graphicsSetPixelDevice(gfx, x, y, col);
}
unsigned int graphicsGetPixel(JsGraphics *gfx, int x, int y) {
graphicsToDeviceCoordinates(gfx, &x, &y);
return graphicsGetPixelDevice(gfx, x, y);
}
void graphicsFillRect(JsGraphics *gfx, int x1, int y1, int x2, int y2, unsigned int col) {
graphicsToDeviceCoordinates(gfx, &x1, &y1);
graphicsToDeviceCoordinates(gfx, &x2, &y2);
graphicsFillRectDevice(gfx, x1, y1, x2, y2, col);
}
void graphicsClear(JsGraphics *gfx) {
graphicsFillRectDevice(gfx,0,0,(int)(gfx->data.width-1),(int)(gfx->data.height-1), gfx->data.bgColor);
}
// ----------------------------------------------------------------------------------------------
void graphicsDrawRect(JsGraphics *gfx, int x1, int y1, int x2, int y2) {
graphicsToDeviceCoordinates(gfx, &x1, &y1);
graphicsToDeviceCoordinates(gfx, &x2, &y2);
// rather than writing pixels, we use fillrect - as it is faster
graphicsFillRectDevice(gfx,x1,y1,x2,y1,gfx->data.fgColor);
graphicsFillRectDevice(gfx,x2,y1,x2,y2,gfx->data.fgColor);
graphicsFillRectDevice(gfx,x1,y2,x2,y2,gfx->data.fgColor);
graphicsFillRectDevice(gfx,x1,y2,x1,y1,gfx->data.fgColor);
}
void graphicsDrawEllipse(JsGraphics *gfx, int posX1, int posY1, int posX2, int posY2){
graphicsToDeviceCoordinates(gfx, &posX1, &posY1);
graphicsToDeviceCoordinates(gfx, &posX2, &posY2);
int posX = (posX1+posX2)/2;
int posY = (posY1+posY2)/2;
int a = (posX2-posX1)/2;
int b = (posY2-posY1)/2;
int dx = 0;
int dy = b;
int a2 = a*a;
int b2 = b*b;
int err = b2-(2*b-1)*a2;
int e2;
bool changed = false;
do {
changed = false;
graphicsSetPixelDevice(gfx,posX+dx,posY+dy,gfx->data.fgColor);
graphicsSetPixelDevice(gfx,posX-dx,posY+dy,gfx->data.fgColor);
graphicsSetPixelDevice(gfx,posX+dx,posY-dy,gfx->data.fgColor);
graphicsSetPixelDevice(gfx,posX-dx,posY-dy,gfx->data.fgColor);
e2 = 2*err;
if (e2 < (2*dx+1)*b2) { dx++; err += (2*dx+1)*b2; changed=true; }
if (e2 > -(2*dy-1)*a2) { dy--; err -= (2*dy-1)*a2; changed=true; }
} while (changed && dy >= 0);
while (dx++ < a) { /* erroneous termination in flat ellipses (b=1) */
graphicsSetPixelDevice(gfx,posX+dx,posY,gfx->data.fgColor);
graphicsSetPixelDevice(gfx,posX-dx,posY,gfx->data.fgColor);
}
}
void graphicsFillEllipse(JsGraphics *gfx, int posX1, int posY1, int posX2, int posY2){
graphicsToDeviceCoordinates(gfx, &posX1, &posY1);
graphicsToDeviceCoordinates(gfx, &posX2, &posY2);
int posX = (posX1+posX2)/2;
int posY = (posY1+posY2)/2;
int a = (posX2-posX1)/2;
int b = (posY2-posY1)/2;
int dx = 0;
int dy = b;
int a2 = a*a;
int b2 = b*b;
int err = b2-(2*b-1)*a2;
int e2;
bool changed = false;
do {
changed = false;
graphicsFillRectDevice(gfx,posX+dx,posY+dy,posX-dx,posY+dy,gfx->data.fgColor);
graphicsFillRectDevice(gfx,posX+dx,posY-dy,posX-dx,posY-dy,gfx->data.fgColor);
e2 = 2*err;
if (e2 < (2*dx+1)*b2) { dx++; err += (2*dx+1)*b2; changed=true; }
if (e2 > -(2*dy-1)*a2) { dy--; err -= (2*dy-1)*a2; changed=true; }
} while (changed && dy >= 0);
while (dx++ < a) { /* erroneous termination in flat ellipses(b=1) */
graphicsFillRectDevice(gfx,posX+dx,posY,posX-dx,posY,gfx->data.fgColor );
}
}
void graphicsDrawLine(JsGraphics *gfx, int x1, int y1, int x2, int y2) {
graphicsToDeviceCoordinates(gfx, &x1, &y1);
graphicsToDeviceCoordinates(gfx, &x2, &y2);
int xl = x2-x1;
int yl = y2-y1;
if (xl<0) xl=-xl; else if (xl==0) xl=1;
if (yl<0) yl=-yl; else if (yl==0) yl=1;
if (xl > yl) { // longer in X - scan in X
if (x1>x2) {
int t;
t = x1; x1 = x2; x2 = t;
t = y1; y1 = y2; y2 = t;
}
int pos = (y1<<8) + 128; // rounding!
int step = ((y2-y1)<<8) / xl;
int x;
for (x=x1;x<=x2;x++) {
graphicsSetPixelDevice(gfx, x, pos>>8, gfx->data.fgColor);
pos += step;
}
} else {
if (y1>y2) {
int t;
t = x1; x1 = x2; x2 = t;
t = y1; y1 = y2; y2 = t;
}
int pos = (x1<<8) + 128; // rounding!
int step = ((x2-x1)<<8) / yl;
int y;
for (y=y1;y<=y2;y++) {
graphicsSetPixelDevice(gfx, pos>>8, y, gfx->data.fgColor);
pos += step;
}
}
}
void graphicsFillPoly(JsGraphics *gfx, int points, short *vertices) {
typedef struct {
short x,y;
} VertXY;
VertXY *v = (VertXY*)vertices;
int i,j,y;
int miny = (int)(gfx->data.height-1);
int maxy = 0;
for (i=0;i<points;i++) {
// convert into device coordinates...
int vx = v[i].x;
int vy = v[i].y;
graphicsToDeviceCoordinates(gfx, &vx, &vy);
v[i].x = (short)vx;
v[i].y = (short)vy;
// work out min and max
short y = v[i].y;
if (y<miny) miny=y;
if (y>maxy) maxy=y;
}
#ifndef SAVE_ON_FLASH
if (miny < gfx->data.clipRect.y1) miny=gfx->data.clipRect.y1;
if (maxy > gfx->data.clipRect.y2) maxy=gfx->data.clipRect.y2;
#else
if (miny<0) miny=0;
if (maxy>=gfx->data.height) maxy=(int)(gfx->data.height-1);
#endif
const int MAX_CROSSES = 64;
// for each scanline
for (y=miny;y<=maxy;y++) {
short cross[MAX_CROSSES];
bool slopes[MAX_CROSSES];
int crosscnt = 0;
// work out all the times lines cross the scanline
j = points-1;
for (i=0;i<points;i++) {
if ((y==miny && (v[i].y==y || v[j].y==y)) || // special-case top line
(v[i].y<y && v[j].y>=y) ||
(v[j].y<y && v[i].y>=y)) {
if (crosscnt < MAX_CROSSES) {
int l = v[j].y - v[i].y;
if (l) { // don't do horiz lines - rely on the ends of the lines that join onto them
cross[crosscnt] = (short)(v[i].x + ((y - v[i].y) * (v[j].x-v[i].x)) / l);
slopes[crosscnt] = (l>1)?1:0;
crosscnt++;
}
}
}
j = i;
}
// bubble sort
for (i=0;i<crosscnt-1;) {
if (cross[i]>cross[i+1]) {
short t=cross[i];
cross[i]=cross[i+1];
cross[i+1]=t;
bool ts=slopes[i];
slopes[i]=slopes[i+1];
slopes[i+1]=ts;
if (i) i--;
} else i++;
}
// Fill the pixels between node pairs.
int x = 0,s = 0;
for (i=0;i<crosscnt;i++) {
if (s==0) x=cross[i];
if (slopes[i]) s++; else s--;
if (!s || i==crosscnt-1) graphicsFillRectDevice(gfx,x,y,cross[i],y,gfx->data.fgColor);
if (jspIsInterrupted()) break;
}
}
}
#ifndef NO_VECTOR_FONT
// prints character, returns width
unsigned int graphicsFillVectorChar(JsGraphics *gfx, int x1, int y1, int size, char ch) {
// no need to modify coordinates as graphicsFillPoly does that
if (size<0) return 0;
if (ch<vectorFontOffset || ch-vectorFontOffset>=vectorFontCount) return 0;
int vertOffset = 0;
int i;
/* compute offset (I figure a ~50 iteration FOR loop is preferable to
* a 200 byte array) */
int fontOffset = ch-vectorFontOffset;
for (i=0;i<fontOffset;i++)
vertOffset += READ_FLASH_UINT8(&vectorFonts[i].vertCount);
VectorFontChar vector;
vector.vertCount = READ_FLASH_UINT8(&vectorFonts[fontOffset].vertCount);
vector.width = READ_FLASH_UINT8(&vectorFonts[fontOffset].width);
short verts[VECTOR_FONT_MAX_POLY_SIZE*2];
int idx=0;
for (i=0;i<vector.vertCount;i+=2) {
verts[idx+0] = (short)(x1 + (((READ_FLASH_UINT8(&vectorFontPolys[vertOffset+i+0])&0x7F)*size + (VECTOR_FONT_POLY_SIZE/2)) / VECTOR_FONT_POLY_SIZE));
verts[idx+1] = (short)(y1 + (((READ_FLASH_UINT8(&vectorFontPolys[vertOffset+i+1])&0x7F)*size + (VECTOR_FONT_POLY_SIZE/2)) / VECTOR_FONT_POLY_SIZE));
idx+=2;
if (READ_FLASH_UINT8(&vectorFontPolys[vertOffset+i+1]) & VECTOR_FONT_POLY_SEPARATOR) {
graphicsFillPoly(gfx,idx/2, verts);
if (jspIsInterrupted()) break;
idx=0;
}
}
return (vector.width * (unsigned int)size)/(VECTOR_FONT_POLY_SIZE*2);
}
// returns the width of a character
unsigned int graphicsVectorCharWidth(JsGraphics *gfx, unsigned int size, char ch) {
NOT_USED(gfx);
if (ch<vectorFontOffset || ch-vectorFontOffset>=vectorFontCount) return 0;
unsigned char width = READ_FLASH_UINT8(&vectorFonts[ch-vectorFontOffset].width);
return (width * (unsigned int)size)/(VECTOR_FONT_POLY_SIZE*2);
}
#endif
/// Draw a simple 1bpp image in foreground colour
void graphicsDrawImage1bpp(JsGraphics *gfx, int x1, int y1, int width, int height, const unsigned char *pixelData) {
int pixel = 256|*(pixelData++);
int x,y;
for (y=y1;y<y1+height;y++) {
for (x=x1;x<x1+width;x++) {
if (pixel&128) graphicsSetPixelDevice(gfx, x, y, gfx->data.fgColor);
pixel = pixel<<1;
if (pixel&65536) pixel = 256|*(pixelData++);
}
}
}
/// Scroll the graphics device (in user coords). X>0 = to right, Y >0 = down
void graphicsScroll(JsGraphics *gfx, int xdir, int ydir) {
// Ensure we flip coordinate system if needed
int x1 = 0, y1 = 0;
int x2 = xdir, y2 = ydir;
graphicsToDeviceCoordinates(gfx, &x1, &y1);
graphicsToDeviceCoordinates(gfx, &x2, &y2);
xdir = x2-x1;
ydir = y2-y1;
// do the scrolling
gfx->scroll(gfx, xdir, ydir);
// fill the new area
if (xdir>0) gfx->fillRect(gfx,0,0,xdir-1,gfx->data.height-1, gfx->data.bgColor);
else if (xdir<0) gfx->fillRect(gfx,gfx->data.width+xdir,0,gfx->data.width-1,gfx->data.height-1, gfx->data.bgColor);
if (ydir>0) gfx->fillRect(gfx,0,0,gfx->data.width-1,ydir-1, gfx->data.bgColor);
else if (ydir<0) gfx->fillRect(gfx,0,gfx->data.height+ydir,gfx->data.width-1,gfx->data.height-1, gfx->data.bgColor);
}
static void graphicsDrawString(JsGraphics *gfx, int x1, int y1, const char *str) {
// no need to modify coordinates as setPixel does that
while (*str) {
graphicsDrawChar4x6(gfx,x1,y1,*(str++),1,false);
x1 = (int)(x1 + 4);
}
}
// Splash screen
void graphicsSplash(JsGraphics *gfx) {
graphicsClear(gfx);
graphicsDrawString(gfx,0,0,"Espruino "JS_VERSION);
graphicsDrawString(gfx,0,6," Embedded JavaScript");
graphicsDrawString(gfx,0,12," www.espruino.com");
}
void graphicsIdle() {
#ifdef USE_LCD_SDL
lcdIdle_SDL();
#endif
}
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