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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"
#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
#ifdef USE_LCD_MEMLCD
#include "lcd_memlcd.h"
#endif
#ifdef USE_LCD_SPI_UNBUF
#include "lcd_spi_unbuf.h"
#endif
// ----------------------------------------------------------------------------------------------
#ifdef GRAPHICS_THEME
/// Global color scheme colours
JsGraphicsTheme graphicsTheme;
#endif
#ifdef ESPR_GRAPHICS_INTERNAL
/// Internal instance of Graphics structure (eg for built-in LCD) so we don't have to store all state in a var
JsGraphics graphicsInternal;
#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 gfx->data.bgColor;
}
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 graphicsFallbackBlit(JsGraphics *gfx, int x1, int y1, int w, int h, int x2, int y2) {
for (int y=0;y<h;y++)
for (int x=0;x<w;x++)
gfx->setPixel(gfx, (int)(x+x2),(int)(y+y2),
gfx->getPixel(gfx, (int)(x+x1),(int)(y+y1)));
}
void graphicsFallbackScrollX(JsGraphics *gfx, int xdir, int yfrom, int yto, int x1, int x2) {
int x;
if (xdir<=0) {
int w = x2+xdir;
for (x=x1;x<=w;x++)
gfx->setPixel(gfx, (int)x,(int)yto,
gfx->getPixel(gfx, (int)(x-xdir),(int)yfrom));
} else { // >0
for (x=x2-xdir;x>=x1;x--)
gfx->setPixel(gfx, (int)(x+xdir),(int)yto,
gfx->getPixel(gfx, (int)x,(int)yfrom));
}
}
void graphicsFallbackScroll(JsGraphics *gfx, int xdir, int ydir, int x1, int y1, int x2, int y2) {
if (xdir==0 && ydir==0) return;
int y;
if (ydir<=0) {
int h = y2+ydir;
for (y=y1;y<=h;y++)
graphicsFallbackScrollX(gfx, xdir, y-ydir, y, x1, x2);
} else { // >0
for (y=y2-ydir;y>=y1;y--)
graphicsFallbackScrollX(gfx, xdir, y, y+ydir, x1, x2);
}
}
// ----------------------------------------------------------------------------------------------
void graphicsStructResetState(JsGraphics *gfx) {
#ifdef GRAPHICS_THEME
// Only set theme for OS-provided graphics (not arraybuffer/etc)
if (gfx->data.type!=JSGRAPHICSTYPE_ARRAYBUFFER &&
gfx->data.type!=JSGRAPHICSTYPE_JS) {
gfx->data.fgColor = graphicsTheme.fg;
gfx->data.bgColor = graphicsTheme.bg;
} else
#endif
{
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;
#endif
#ifndef NO_MODIFIED_AREA
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 NO_MODIFIED_AREA
gfx->data.modMaxX = -32768;
gfx->data.modMaxY = -32768;
gfx->data.modMinX = 32767;
gfx->data.modMinY = 32767;
#endif
}
/// Set up the callbacks for this graphics instance (usually done by graphicsGetFromVar)
bool graphicsSetCallbacks(JsGraphics *gfx) {
gfx->setPixel = graphicsFallbackSetPixel;
gfx->getPixel = graphicsFallbackGetPixel;
gfx->fillRect = graphicsFallbackFillRect;
gfx->blit = graphicsFallbackBlit;
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
#ifdef USE_LCD_MEMLCD
} else if (gfx->data.type == JSGRAPHICSTYPE_MEMLCD) {
lcdMemLCD_setCallbacks(gfx);
#endif
#ifdef USE_LCD_SPI_UNBUF
} else if (gfx->data.type == JSGRAPHICSTYPE_LCD_SPI_UNBUF) {
lcd_spi_unbuf_setCallbacks(gfx);
#endif
} else {
jsExceptionHere(JSET_INTERNALERROR, "Unknown graphics type\n");
assert(0);
return false;
}
return true;
}
bool graphicsGetFromVar(JsGraphics *gfx, JsVar *parent) {
gfx->graphicsVar = parent;
// jsvObjectGetChild can handle parent==NULL
JsVar *data = jsvObjectGetChild(parent, JS_HIDDEN_CHAR_STR"gfx", 0);
#if ESPR_GRAPHICS_INTERNAL
if (!data) {
*gfx = graphicsInternal;
return true;
}
#endif
assert(data);
if (data) {
jsvGetStringChars(data,0,(char*)&gfx->data, sizeof(JsGraphicsData));
jsvUnLock(data);
return graphicsSetCallbacks(gfx);
} else
return false;
}
// Set the data variable for graphics - called initially when a graphics instance is first make
void graphicsSetVarInitial(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);
}
// Set the data variable for graphics - graphics data must exist
void graphicsSetVar(JsGraphics *gfx) {
JsVar *data = jsvSkipNameAndUnLock(jsvFindChildFromString(gfx->graphicsVar, JS_HIDDEN_CHAR_STR"gfx", false));
#if ESPR_GRAPHICS_INTERNAL
if (!data) {
graphicsInternal = *gfx;
return;
}
#endif
if (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));
}
// If graphics is flipped or rotated then the coordinates need modifying. This is to go back - eg for touchscreens
void deviceToGraphicsCoordinates(const JsGraphics *gfx, int *x, int *y) {
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));
if (gfx->data.flags & JSGRAPHICSFLAGS_SWAP_XY) {
int t = *x;
*x = *y;
*y = t;
}
}
// If graphics is flipped or rotated then the coordinates need modifying
void graphicsToDeviceCoordinates16x(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-1)*16 - *x);
if (gfx->data.flags & JSGRAPHICSFLAGS_INVERT_Y) *y = (int)((gfx->data.height-1)*16 - *y);
}
unsigned short graphicsGetWidth(const JsGraphics *gfx) {
return (gfx->data.flags & JSGRAPHICSFLAGS_SWAP_XY) ? gfx->data.height : gfx->data.width;
}
unsigned short graphicsGetHeight(const JsGraphics *gfx) {
return (gfx->data.flags & JSGRAPHICSFLAGS_SWAP_XY) ? gfx->data.width : gfx->data.height;
}
// Set the area modified by a draw command and also clip to the screen/clipping bounds
bool graphicsSetModifiedAndClip(JsGraphics *gfx, int *x1, int *y1, int *x2, int *y2) {
bool modified = false;
#ifndef NO_MODIFIED_AREA
if (*x1<gfx->data.clipRect.x1) { *x1 = gfx->data.clipRect.x1; modified = true; }
if (*y1<gfx->data.clipRect.y1) { *y1 = gfx->data.clipRect.y1; modified = true; }
if (*x2>gfx->data.clipRect.x2) { *x2 = gfx->data.clipRect.x2; modified = true; }
if (*y2>gfx->data.clipRect.y2) { *y2 = gfx->data.clipRect.y2; modified = true; }
if (*x1 < gfx->data.modMinX) { gfx->data.modMinX=(short)*x1; modified = true; }
if (*x2 > gfx->data.modMaxX) { gfx->data.modMaxX=(short)*x2; modified = true; }
if (*y1 < gfx->data.modMinY) { gfx->data.modMinY=(short)*y1; modified = true; }
if (*y2 > gfx->data.modMaxY) { gfx->data.modMaxY=(short)*y2; modified = true; }
#else
if (*x1<0) { *x1 = 0; modified = true; }
if (*y1<0) { *y1 = 0; modified = true; }
if (*x2>=gfx->data.width) { *x2 = gfx->data.width-1; modified = true; }
if (*y2>=gfx->data.height) { *y2 = gfx->data.height-1; modified = true; }
#endif
return modified;
}
// Set the area modified by a draw command
void graphicsSetModified(JsGraphics *gfx, int x1, int y1, int x2, int y2) {
#ifndef NO_MODIFIED_AREA
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
}
/// Get a setPixel function (assuming coordinates already clipped with graphicsSetModifiedAndClip) - if all is ok it can choose a faster draw function
JsGraphicsSetPixelFn graphicsGetSetPixelFn(JsGraphics *gfx) {
if (gfx->data.flags & JSGRAPHICSFLAGS_MAPPEDXY)
return graphicsSetPixel; // fallback
else
return gfx->setPixel; // fast
}
/// Get a setPixel function (assuming no clipping by caller) - if all is ok it can choose a faster draw function
JsGraphicsSetPixelFn graphicsGetSetPixelUnclippedFn(JsGraphics *gfx, int x1, int y1, int x2, int y2) {
if ((gfx->data.flags & JSGRAPHICSFLAGS_MAPPEDXY) ||
graphicsSetModifiedAndClip(gfx,&x1,&y1,&x2,&y2))
return graphicsSetPixel; // fallback
else
return gfx->setPixel; // fast
}
/// Merge one color into another based on current bit depth (amt is 0..256)
uint32_t graphicsBlendColor(JsGraphics *gfx, unsigned int fg, unsigned int bg, int iamt) {
unsigned int amt = (iamt>0) ? (unsigned)iamt : 0;
if (amt>256) amt=256;
if (gfx->data.bpp==2 || gfx->data.bpp==4 || gfx->data.bpp==8) {
// TODO: if our graphics instance is paletted this isn't correct!
return (bg*(256-amt) + fg*amt) >> 8;
} else if (gfx->data.bpp==16) { // Blend from bg to fg
unsigned int b = bg;
unsigned int br = (b>>11)&0x1F;
unsigned int bg = (b>>5)&0x3F;
unsigned int bb = b&0x1F;
unsigned int f = fg;
unsigned int fr = (f>>11)&0x1F;
unsigned int fg = (f>>5)&0x3F;
unsigned int fb = f&0x1F;
unsigned int ri = (br*(256-amt) + fr*amt) >> 8;
unsigned int gi = (bg*(256-amt) + fg*amt) >> 8;
unsigned int bi = (bb*(256-amt) + fb*amt) >> 8;
return (bi | gi<<5 | ri<<11);
#ifdef ESPR_GRAPHICS_12BIT
} else if (gfx->data.bpp==12) { // Blend from bg to fg
unsigned int b = bg;
unsigned int br = (b>>8)&0x0F;
unsigned int bg = (b>>4)&0x0F;
unsigned int bb = b&0x0F;
unsigned int f = fg;
unsigned int fr = (f>>8)&0x0F;
unsigned int fg = (f>>4)&0x0F;
unsigned int fb = f&0x0F;
unsigned int ri = (br*(256-amt) + fr*amt) >> 8;
unsigned int gi = (bg*(256-amt) + fg*amt) >> 8;
unsigned int bi = (bb*(256-amt) + fb*amt) >> 8;
return (bi | gi<<4 | ri<<8);
#endif
} else if (gfx->data.bpp==24) { // Blend from bg to fg
unsigned int b = bg;
unsigned int br = (b>>16)&0xFF;
unsigned int bg = (b>>8)&0xFF;
unsigned int bb = b&0xFF;
unsigned int f = fg;
unsigned int fr = (f>>16)&0xFF;
unsigned int fg = (f>>8)&0xFF;
unsigned int fb = f&0xFF;
unsigned int ri = (br*(256-amt) + fr*amt) >> 8;
unsigned int gi = (bg*(256-amt) + fg*amt) >> 8;
unsigned int bi = (bb*(256-amt) + fb*amt) >> 8;
return (bi | gi<<8 | ri<<16);
}
// Memory LCD is 3 bit, so best bet is just to choose one or the other
return (amt>=128) ? fg : bg;
}
/// Merge one color into another based on current bit depth (amt is 0..256)
uint32_t graphicsBlendGfxColor(JsGraphics *gfx, int iamt) {
return graphicsBlendColor(gfx, gfx->data.fgColor, gfx->data.bgColor, iamt);
}
// ----------------------------------------------------------------------------------------------
static void graphicsSetPixelDevice(JsGraphics *gfx, int x, int y, unsigned int col) {
#ifndef NO_MODIFIED_AREA
if (x<gfx->data.clipRect.x1 ||
y<gfx->data.clipRect.y1 ||
x>gfx->data.clipRect.x2 ||
y>gfx->data.clipRect.y2) return;
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;
#else
if (x<0 || y<0 || x>=gfx->data.width || y>=gfx->data.height) return;
#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);
}
/// For Antialiasing - blends between FG and BG colors
static void graphicsSetPixelDeviceBlended(JsGraphics *gfx, int x, int y, int amt) {
unsigned int bg = graphicsGetPixelDevice(gfx, x, y);
unsigned int col = graphicsBlendColor(gfx, gfx->data.fgColor, bg, amt);
graphicsSetPixelDevice(gfx, x, y, col);
}
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 NO_MODIFIED_AREA
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);
if (posX1>posX2) {
int t=posX1;posX1=posX2;posX2=t;
}
if (posY1>posY2) {
int t=posY1;posY1=posY2;posY2=t;
}
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);
if (posX1>posX2) {
int t=posX1;posX1=posX2;posX2=t;
}
if (posY1>posY2) {
int t=posY1;posY1=posY2;posY2=t;
}
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;
e2 = 2*err;
if (e2 < (2*dx+1)*b2) { dx++; err += (2*dx+1)*b2; changed=true; }
if (e2 > -(2*dy-1)*a2) {
// draw only just before we change Y, to avoid a bunch of overdraw
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);
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 graphicsFillAnnulus(JsGraphics *gfx, int x0, int y0, int r1, int r2, unsigned short quadrants){
graphicsToDeviceCoordinates(gfx, &x0, &y0);
int x = 0;
int y1 = r1;
int y2 = r2;
int d1 = 3-2*r1;
int d2 = 3-2*r2;
do {
if (quadrants & 0x01) { // Will currently overdraw into other quadrants if r1 <= (r2/2)
graphicsFillRectDevice(gfx, x0+x, y0-y1, x0+x, y0-y2, gfx->data.fgColor);
graphicsFillRectDevice(gfx, x0+y1, y0-x, x0+y2, y0-x, gfx->data.fgColor);
}
if (quadrants & 0x02) {
graphicsFillRectDevice(gfx, x0+x, y0+y1, x0+x, y0+y2, gfx->data.fgColor);
graphicsFillRectDevice(gfx, x0+y1, y0+x, x0+y2, y0+x, gfx->data.fgColor);
}
if (quadrants & 0x04) {
graphicsFillRectDevice(gfx, x0-x, y0+y1, x0-x, y0+y2, gfx->data.fgColor);
graphicsFillRectDevice(gfx, x0-y1, y0+x, x0-y2, y0+x, gfx->data.fgColor);
}
if (quadrants & 0x08) {
graphicsFillRectDevice(gfx, x0-x, y0-y1, x0-x, y0-y2, gfx->data.fgColor);
graphicsFillRectDevice(gfx, x0-y1, y0-x, x0-y2, y0-x, gfx->data.fgColor);
}
x++;
if (d1 > 0) {
y1--;
d1 += 4*(x-y1)+10;
}
else d1 += 4*x+6;
if (d2 > 0) {
y2--;
d2 += 4*(x-y2)+10;
}
else d2 += 4*x+6;
} while (y2 >= x);
}
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;
}
}
}
#ifdef GRAPHICS_ANTIALIAS
// In 16x accuracy
void graphicsDrawLineAA(JsGraphics *gfx, int ix1, int iy1, int ix2, int iy2) {
// https://en.wikipedia.org/wiki/Xiaolin_Wu%27s_line_algorithm
graphicsToDeviceCoordinates16x(gfx, &ix1, &iy1);
graphicsToDeviceCoordinates16x(gfx, &ix2, &iy2);
int x0 = ix1*16;
int y0 = iy1*16;
int x1 = ix2*16;
int y1 = iy2*16;
bool steep = abs(y1 - y0) > abs(x1 - x0);
if (steep) {
int t;
t=x0;x0=y0;y0=t;
t=x1;x1=y1;y1=t;
}
if (x0 > x1) {
int t;
t=x0;x0=x1;x1=t;
t=y0;y0=y1;y1=t;
}
int dx = x1 - x0;
int dy = y1 - y0;
int gradient = dx ? ((dy<<8) / dx) : 256;
// handle first endpoint
int xend = x0 & ~255;
int yend = y0 + ((gradient * (xend - x0)) >> 8);
int xgap = 255 - (x0 & 255);
int xpxl1 = xend >> 8; // this will be used in the main loop
int ypxl1 = yend >> 8;
int c = yend & 255;
if (steep) {
graphicsSetPixelDeviceBlended(gfx, ypxl1, xpxl1, ((256-c)*xgap)>>8);
graphicsSetPixelDeviceBlended(gfx, ypxl1+1, xpxl1, (c*xgap)>>8);
} else {
graphicsSetPixelDeviceBlended(gfx, xpxl1, ypxl1, ((256-c)*xgap)>>8);
graphicsSetPixelDeviceBlended(gfx, xpxl1, ypxl1+1, (c*xgap)>>8);
}
int intery = yend + gradient; // first y-intersection for the main loop
// handle second endpoint
xend = (x1+256) & ~255;
yend = y1 + ((gradient * (xend - x1)) >> 8);
xgap = (x1+256) & 255;
int xpxl2 = xend>>8; //this will be used in the main loop
int ypxl2 = yend>>8;
c = yend & 255;
if (steep) {
graphicsSetPixelDeviceBlended(gfx, ypxl2 , xpxl2, ((256-c)*xgap)>>8);
graphicsSetPixelDeviceBlended(gfx, ypxl2+1, xpxl2, (c*xgap)>>8);
} else {
graphicsSetPixelDeviceBlended(gfx, xpxl2, ypxl2, ((256-c)*xgap)>>8);
graphicsSetPixelDeviceBlended(gfx, xpxl2, ypxl2+1, (c*xgap)>>8);
}
// main loop
for (int x=xpxl1+1;x<xpxl2;x++) {
int y = intery>>8;
c = intery & 255;
if (steep) {
graphicsSetPixelDeviceBlended(gfx, y , x, 256-c);
graphicsSetPixelDeviceBlended(gfx, y+1, x, c);
} else {
graphicsSetPixelDeviceBlended(gfx, x, y, 256-c);
graphicsSetPixelDeviceBlended(gfx, x, y+1, c);
}
intery += gradient;
}
}
void graphicsDrawCircleAA(JsGraphics *gfx, int x0, int y0, int r){
graphicsToDeviceCoordinates(gfx, &x0, &y0);
int x = -r;
int y = 0;
int err = 2-2*r;
int i, x2, e2;
r = 1-err;
do {
i = 255-255*abs(err-2*(x+y)-2)/r;
graphicsSetPixelDeviceBlended(gfx, x0-x, y0+y, i);
graphicsSetPixelDeviceBlended(gfx, x0-y, y0-x, i);
graphicsSetPixelDeviceBlended(gfx, x0+x, y0-y, i);
graphicsSetPixelDeviceBlended(gfx, x0+y, y0+x, i);
e2 = err;
x2 = x;
if (err+y > 0) { // X step
i = 255-255*(err-2*x-1)/r; // Outward pixel
if (i > 0) {
graphicsSetPixelDeviceBlended(gfx, x0-x, y0+y+1, i);
graphicsSetPixelDeviceBlended(gfx, x0-y-1, y0-x, i);
graphicsSetPixelDeviceBlended(gfx, x0+x, y0-y-1, i);
graphicsSetPixelDeviceBlended(gfx, x0+y+1, y0+x, i);
}
err += ++x*2+1;
}
if (e2+x2 <= 0) { // Y step
i = 255-255*(2*y+3-e2)/r; // Inward pixel
if (i > 0) {
graphicsSetPixelDeviceBlended(gfx, x0-x2-1, y0+y, i);
graphicsSetPixelDeviceBlended(gfx, x0-y, y0-x2-1, i);
graphicsSetPixelDeviceBlended(gfx, x0+x2+1, y0-y, i);
graphicsSetPixelDeviceBlended(gfx, x0+y, y0+x2+1, i);
}
err += ++y*2+1;
}
} while (x < 0);
}
#endif
// Fill poly - each member of vertices is 1/16th pixel
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;
graphicsToDeviceCoordinates16x(gfx, &vx, &vy);
v[i].x = (short)vx;
v[i].y = (short)vy;
// work out min and max
short y = v[i].y>>4;
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<<4;y<=maxy<<4;y+=16) {
int yl = y>>4;
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 ((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) {
int x1 = (x+15)>>4;
int x2 = (cross[i]+15)>>4;
if (x2>x1) graphicsFillRectDevice(gfx,x1,yl,x2-1,yl,gfx->data.fgColor);
}
if (jspIsInterrupted()) break;
}
}
}
/// 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;
// range check - if too big no point scrolling
bool scroll = true;
if (xdir>gfx->data.width) { xdir=gfx->data.width; scroll=false; }
if (xdir<-gfx->data.width) { xdir=-gfx->data.width; scroll=false; }
if (ydir>gfx->data.height) { ydir=gfx->data.height; scroll=false; }
if (ydir<-gfx->data.height) { ydir=-gfx->data.height; scroll=false; }
// do the scrolling
#ifdef NO_MODIFIED_AREA
x1=0;
y1=0;
x2=gfx->data.width-1;
x2=gfx->data.height-1;
#else
x1=gfx->data.clipRect.x1;
y1=gfx->data.clipRect.y1;
x2=gfx->data.clipRect.x2;
y2=gfx->data.clipRect.y2;
#endif
if (scroll) gfx->scroll(gfx, xdir, ydir, x1,y1,x2,y2);
graphicsSetModified(gfx, x1,y1,x2,y2);
// fill the new area
if (xdir>0) gfx->fillRect(gfx,x1,y1,x1+xdir-1,y2, gfx->data.bgColor);
else if (xdir<0) gfx->fillRect(gfx,x2+1+xdir,y1,x2,y2, gfx->data.bgColor);
if (ydir>0) gfx->fillRect(gfx,x1,y1,x2,y1+ydir-1, gfx->data.bgColor);
else if (ydir<0) gfx->fillRect(gfx,x1,y2+1+ydir,x2,y2, 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++),1,1,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
}