executable file 2476 lines (2111 sloc) 69.8 KB
//
// CanvasRenderingContext2d.cc
//
// Copyright (c) 2010 LearnBoost <tj@learnboost.com>
//
#include <math.h>
#include <string.h>
#include <stdlib.h>
#include <limits>
#include <vector>
#include <algorithm>
#include "Canvas.h"
#include "Point.h"
#include "Image.h"
#include "ImageData.h"
#include "CanvasRenderingContext2d.h"
#include "CanvasGradient.h"
#include "CanvasPattern.h"
#ifdef HAVE_FREETYPE
#include "FontFace.h"
#endif
// Windows doesn't support the C99 names for these
#ifdef _MSC_VER
#define isnan(x) _isnan(x)
#define isinf(x) (!_finite(x))
#endif
#ifndef isnan
#define isnan(x) std::isnan(x)
#define isinf(x) std::isinf(x)
#endif
Nan::Persistent<FunctionTemplate> Context2d::constructor;
/*
* Rectangle arg assertions.
*/
#define RECT_ARGS \
if (!info[0]->IsNumber() \
||!info[1]->IsNumber() \
||!info[2]->IsNumber() \
||!info[3]->IsNumber()) return; \
double x = info[0]->NumberValue(); \
double y = info[1]->NumberValue(); \
double width = info[2]->NumberValue(); \
double height = info[3]->NumberValue();
/*
* Text baselines.
*/
enum {
TEXT_BASELINE_ALPHABETIC
, TEXT_BASELINE_TOP
, TEXT_BASELINE_BOTTOM
, TEXT_BASELINE_MIDDLE
, TEXT_BASELINE_IDEOGRAPHIC
, TEXT_BASELINE_HANGING
};
#if HAVE_PANGO
/*
* State helper function
*/
void state_assign_fontFamily(canvas_state_t *state, const char *str) {
free(state->fontFamily);
state->fontFamily = strndup(str, 100);
}
/*
* Simple helper macro for a rather verbose function call.
*/
#define PANGO_LAYOUT_GET_METRICS(LAYOUT) pango_context_get_metrics( \
pango_layout_get_context(LAYOUT), \
pango_layout_get_font_description(LAYOUT), \
pango_context_get_language(pango_layout_get_context(LAYOUT)))
#endif
/*
* Initialize Context2d.
*/
void
Context2d::Initialize(Nan::ADDON_REGISTER_FUNCTION_ARGS_TYPE target) {
Nan::HandleScope scope;
// Constructor
Local<FunctionTemplate> ctor = Nan::New<FunctionTemplate>(Context2d::New);
constructor.Reset(ctor);
ctor->InstanceTemplate()->SetInternalFieldCount(1);
ctor->SetClassName(Nan::New("CanvasRenderingContext2D").ToLocalChecked());
// Prototype
Local<ObjectTemplate> proto = ctor->PrototypeTemplate();
Nan::SetPrototypeMethod(ctor, "drawImage", DrawImage);
Nan::SetPrototypeMethod(ctor, "putImageData", PutImageData);
Nan::SetPrototypeMethod(ctor, "getImageData", GetImageData);
Nan::SetPrototypeMethod(ctor, "addPage", AddPage);
Nan::SetPrototypeMethod(ctor, "save", Save);
Nan::SetPrototypeMethod(ctor, "restore", Restore);
Nan::SetPrototypeMethod(ctor, "rotate", Rotate);
Nan::SetPrototypeMethod(ctor, "translate", Translate);
Nan::SetPrototypeMethod(ctor, "transform", Transform);
Nan::SetPrototypeMethod(ctor, "resetTransform", ResetTransform);
Nan::SetPrototypeMethod(ctor, "isPointInPath", IsPointInPath);
Nan::SetPrototypeMethod(ctor, "scale", Scale);
Nan::SetPrototypeMethod(ctor, "clip", Clip);
Nan::SetPrototypeMethod(ctor, "fill", Fill);
Nan::SetPrototypeMethod(ctor, "stroke", Stroke);
Nan::SetPrototypeMethod(ctor, "fillText", FillText);
Nan::SetPrototypeMethod(ctor, "strokeText", StrokeText);
Nan::SetPrototypeMethod(ctor, "fillRect", FillRect);
Nan::SetPrototypeMethod(ctor, "strokeRect", StrokeRect);
Nan::SetPrototypeMethod(ctor, "clearRect", ClearRect);
Nan::SetPrototypeMethod(ctor, "rect", Rect);
Nan::SetPrototypeMethod(ctor, "measureText", MeasureText);
Nan::SetPrototypeMethod(ctor, "moveTo", MoveTo);
Nan::SetPrototypeMethod(ctor, "lineTo", LineTo);
Nan::SetPrototypeMethod(ctor, "bezierCurveTo", BezierCurveTo);
Nan::SetPrototypeMethod(ctor, "quadraticCurveTo", QuadraticCurveTo);
Nan::SetPrototypeMethod(ctor, "beginPath", BeginPath);
Nan::SetPrototypeMethod(ctor, "closePath", ClosePath);
Nan::SetPrototypeMethod(ctor, "arc", Arc);
Nan::SetPrototypeMethod(ctor, "arcTo", ArcTo);
Nan::SetPrototypeMethod(ctor, "setLineDash", SetLineDash);
Nan::SetPrototypeMethod(ctor, "getLineDash", GetLineDash);
Nan::SetPrototypeMethod(ctor, "_setFont", SetFont);
#ifdef HAVE_FREETYPE
Nan::SetPrototypeMethod(ctor, "_setFontFace", SetFontFace);
#endif
Nan::SetPrototypeMethod(ctor, "_setFillColor", SetFillColor);
Nan::SetPrototypeMethod(ctor, "_setStrokeColor", SetStrokeColor);
Nan::SetPrototypeMethod(ctor, "_setFillPattern", SetFillPattern);
Nan::SetPrototypeMethod(ctor, "_setStrokePattern", SetStrokePattern);
Nan::SetPrototypeMethod(ctor, "_setTextBaseline", SetTextBaseline);
Nan::SetPrototypeMethod(ctor, "_setTextAlignment", SetTextAlignment);
Nan::SetAccessor(proto, Nan::New("patternQuality").ToLocalChecked(), GetPatternQuality, SetPatternQuality);
Nan::SetAccessor(proto, Nan::New("globalCompositeOperation").ToLocalChecked(), GetGlobalCompositeOperation, SetGlobalCompositeOperation);
Nan::SetAccessor(proto, Nan::New("globalAlpha").ToLocalChecked(), GetGlobalAlpha, SetGlobalAlpha);
Nan::SetAccessor(proto, Nan::New("shadowColor").ToLocalChecked(), GetShadowColor, SetShadowColor);
Nan::SetAccessor(proto, Nan::New("fillColor").ToLocalChecked(), GetFillColor);
Nan::SetAccessor(proto, Nan::New("strokeColor").ToLocalChecked(), GetStrokeColor);
Nan::SetAccessor(proto, Nan::New("miterLimit").ToLocalChecked(), GetMiterLimit, SetMiterLimit);
Nan::SetAccessor(proto, Nan::New("lineWidth").ToLocalChecked(), GetLineWidth, SetLineWidth);
Nan::SetAccessor(proto, Nan::New("lineCap").ToLocalChecked(), GetLineCap, SetLineCap);
Nan::SetAccessor(proto, Nan::New("lineJoin").ToLocalChecked(), GetLineJoin, SetLineJoin);
Nan::SetAccessor(proto, Nan::New("lineDashOffset").ToLocalChecked(), GetLineDashOffset, SetLineDashOffset);
Nan::SetAccessor(proto, Nan::New("shadowOffsetX").ToLocalChecked(), GetShadowOffsetX, SetShadowOffsetX);
Nan::SetAccessor(proto, Nan::New("shadowOffsetY").ToLocalChecked(), GetShadowOffsetY, SetShadowOffsetY);
Nan::SetAccessor(proto, Nan::New("shadowBlur").ToLocalChecked(), GetShadowBlur, SetShadowBlur);
Nan::SetAccessor(proto, Nan::New("antialias").ToLocalChecked(), GetAntiAlias, SetAntiAlias);
Nan::SetAccessor(proto, Nan::New("textDrawingMode").ToLocalChecked(), GetTextDrawingMode, SetTextDrawingMode);
Nan::SetAccessor(proto, Nan::New("filter").ToLocalChecked(), GetFilter, SetFilter);
Nan::Set(target, Nan::New("CanvasRenderingContext2d").ToLocalChecked(), ctor->GetFunction());
}
/*
* Create a cairo context.
*/
Context2d::Context2d(Canvas *canvas) {
_canvas = canvas;
_context = cairo_create(canvas->surface());
#if HAVE_PANGO
_layout = pango_cairo_create_layout(_context);
#endif
cairo_set_line_width(_context, 1);
state = states[stateno = 0] = (canvas_state_t *) malloc(sizeof(canvas_state_t));
state->shadowBlur = 0;
state->shadowOffsetX = state->shadowOffsetY = 0;
state->globalAlpha = 1;
state->textAlignment = -1;
state->fillPattern = state->strokePattern = NULL;
state->fillGradient = state->strokeGradient = NULL;
state->textBaseline = TEXT_BASELINE_ALPHABETIC;
rgba_t transparent = { 0,0,0,1 };
rgba_t transparent_black = { 0,0,0,0 };
state->fill = transparent;
state->stroke = transparent;
state->shadow = transparent_black;
state->patternQuality = CAIRO_FILTER_GOOD;
state->textDrawingMode = TEXT_DRAW_PATHS;
#if HAVE_PANGO
state->fontWeight = PANGO_WEIGHT_NORMAL;
state->fontStyle = PANGO_STYLE_NORMAL;
state->fontSize = 10;
state->fontFamily = NULL;
state_assign_fontFamily(state, "sans serif");
setFontFromState();
#endif
}
/*
* Destroy cairo context.
*/
Context2d::~Context2d() {
while(stateno >= 0) {
#if HAVE_PANGO
free(states[stateno]->fontFamily);
#endif
free(states[stateno--]);
}
#if HAVE_PANGO
g_object_unref(_layout);
#endif
cairo_destroy(_context);
}
/*
* Save cairo / canvas state.
*/
void
Context2d::save() {
cairo_save(_context);
saveState();
}
/*
* Restore cairo / canvas state.
*/
void
Context2d::restore() {
cairo_restore(_context);
restoreState();
}
/*
* Save the current state.
*/
void
Context2d::saveState() {
if (stateno == CANVAS_MAX_STATES) return;
states[++stateno] = (canvas_state_t *) malloc(sizeof(canvas_state_t));
memcpy(states[stateno], state, sizeof(canvas_state_t));
#if HAVE_PANGO
states[stateno]->fontFamily = strndup(state->fontFamily, 100);
#endif
state = states[stateno];
}
/*
* Restore state.
*/
void
Context2d::restoreState() {
if (0 == stateno) return;
// Olaf (2011-02-21): Free old state data
#if HAVE_PANGO
free(states[stateno]->fontFamily);
#endif
free(states[stateno]);
states[stateno] = NULL;
state = states[--stateno];
#if HAVE_PANGO
setFontFromState();
#endif
}
/*
* Save flat path.
*/
void
Context2d::savePath() {
_path = cairo_copy_path_flat(_context);
cairo_new_path(_context);
}
/*
* Restore flat path.
*/
void
Context2d::restorePath() {
cairo_new_path(_context);
cairo_append_path(_context, _path);
cairo_path_destroy(_path);
}
/*
* Fill and apply shadow.
*/
void
Context2d::setFillRule(v8::Local<v8::Value> value) {
cairo_fill_rule_t rule = CAIRO_FILL_RULE_WINDING;
if (value->IsString()) {
String::Utf8Value str(value);
if (std::strcmp(*str, "evenodd") == 0) {
rule = CAIRO_FILL_RULE_EVEN_ODD;
}
}
cairo_set_fill_rule(_context, rule);
}
void
Context2d::fill(bool preserve) {
if (state->fillPattern) {
cairo_set_source(_context, state->fillPattern);
cairo_pattern_set_extend(cairo_get_source(_context), CAIRO_EXTEND_REPEAT);
// TODO repeat/repeat-x/repeat-y
} else if (state->fillGradient) {
cairo_pattern_set_filter(state->fillGradient, state->patternQuality);
cairo_set_source(_context, state->fillGradient);
} else {
setSourceRGBA(state->fill);
}
if (preserve) {
hasShadow()
? shadow(cairo_fill_preserve)
: cairo_fill_preserve(_context);
} else {
hasShadow()
? shadow(cairo_fill)
: cairo_fill(_context);
}
}
/*
* Stroke and apply shadow.
*/
void
Context2d::stroke(bool preserve) {
if (state->strokePattern) {
cairo_set_source(_context, state->strokePattern);
cairo_pattern_set_extend(cairo_get_source(_context), CAIRO_EXTEND_REPEAT);
} else if (state->strokeGradient) {
cairo_pattern_set_filter(state->strokeGradient, state->patternQuality);
cairo_set_source(_context, state->strokeGradient);
} else {
setSourceRGBA(state->stroke);
}
if (preserve) {
hasShadow()
? shadow(cairo_stroke_preserve)
: cairo_stroke_preserve(_context);
} else {
hasShadow()
? shadow(cairo_stroke)
: cairo_stroke(_context);
}
}
/*
* Apply shadow with the given draw fn.
*/
void
Context2d::shadow(void (fn)(cairo_t *cr)) {
cairo_path_t *path = cairo_copy_path_flat(_context);
cairo_save(_context);
// shadowOffset is unaffected by current transform
cairo_matrix_t path_matrix;
cairo_get_matrix(_context, &path_matrix);
cairo_identity_matrix(_context);
// Apply shadow
cairo_push_group(_context);
// No need to invoke blur if shadowBlur is 0
if (state->shadowBlur) {
// find out extent of path
double x1, y1, x2, y2;
if (fn == cairo_fill || fn == cairo_fill_preserve) {
cairo_fill_extents(_context, &x1, &y1, &x2, &y2);
} else {
cairo_stroke_extents(_context, &x1, &y1, &x2, &y2);
}
// create new image surface that size + padding for blurring
double dx = x2-x1, dy = y2-y1;
cairo_user_to_device_distance(_context, &dx, &dy);
int pad = state->shadowBlur * 2;
cairo_surface_t *shadow_surface = cairo_image_surface_create(
CAIRO_FORMAT_ARGB32,
dx + 2 * pad,
dy + 2 * pad);
cairo_t *shadow_context = cairo_create(shadow_surface);
// transform path to the right place
cairo_translate(shadow_context, pad-x1, pad-y1);
cairo_transform(shadow_context, &path_matrix);
// draw the path and blur
cairo_set_line_width(shadow_context, cairo_get_line_width(_context));
cairo_new_path(shadow_context);
cairo_append_path(shadow_context, path);
setSourceRGBA(shadow_context, state->shadow);
fn(shadow_context);
blur(shadow_surface, state->shadowBlur);
// paint to original context
cairo_set_source_surface(_context, shadow_surface,
x1 - pad + state->shadowOffsetX + 1,
y1 - pad + state->shadowOffsetY + 1);
cairo_paint(_context);
cairo_destroy(shadow_context);
cairo_surface_destroy(shadow_surface);
} else {
// Offset first, then apply path's transform
cairo_translate(
_context
, state->shadowOffsetX
, state->shadowOffsetY);
cairo_transform(_context, &path_matrix);
// Apply shadow
cairo_new_path(_context);
cairo_append_path(_context, path);
setSourceRGBA(state->shadow);
fn(_context);
}
// Paint the shadow
cairo_pop_group_to_source(_context);
cairo_paint(_context);
// Restore state
cairo_restore(_context);
cairo_new_path(_context);
cairo_append_path(_context, path);
fn(_context);
cairo_path_destroy(path);
}
/*
* Set source RGBA for the current context
*/
void
Context2d::setSourceRGBA(rgba_t color) {
setSourceRGBA(_context, color);
}
/*
* Set source RGBA
*/
void
Context2d::setSourceRGBA(cairo_t *ctx, rgba_t color) {
cairo_set_source_rgba(
ctx
, color.r
, color.g
, color.b
, color.a * state->globalAlpha);
}
/*
* Check if the context has a drawable shadow.
*/
bool
Context2d::hasShadow() {
return state->shadow.a
&& (state->shadowBlur || state->shadowOffsetX || state->shadowOffsetY);
}
/*
* Blur the given surface with the given radius.
*/
void
Context2d::blur(cairo_surface_t *surface, int radius) {
// Steve Hanov, 2009
// Released into the public domain.
radius = radius * 0.57735f + 0.5f;
// get width, height
int width = cairo_image_surface_get_width( surface );
int height = cairo_image_surface_get_height( surface );
unsigned* precalc =
(unsigned*)malloc(width*height*sizeof(unsigned));
cairo_surface_flush( surface );
unsigned char* src = cairo_image_surface_get_data( surface );
double mul=1.f/((radius*2)*(radius*2));
int channel;
// The number of times to perform the averaging. According to wikipedia,
// three iterations is good enough to pass for a gaussian.
const int MAX_ITERATIONS = 3;
int iteration;
for ( iteration = 0; iteration < MAX_ITERATIONS; iteration++ ) {
for( channel = 0; channel < 4; channel++ ) {
int x,y;
// precomputation step.
unsigned char* pix = src;
unsigned* pre = precalc;
pix += channel;
for (y=0;y<height;y++) {
for (x=0;x<width;x++) {
int tot=pix[0];
if (x>0) tot+=pre[-1];
if (y>0) tot+=pre[-width];
if (x>0 && y>0) tot-=pre[-width-1];
*pre++=tot;
pix += 4;
}
}
// blur step.
pix = src + (int)radius * width * 4 + (int)radius * 4 + channel;
for (y=radius;y<height-radius;y++) {
for (x=radius;x<width-radius;x++) {
int l = x < radius ? 0 : x - radius;
int t = y < radius ? 0 : y - radius;
int r = x + radius >= width ? width - 1 : x + radius;
int b = y + radius >= height ? height - 1 : y + radius;
int tot = precalc[r+b*width] + precalc[l+t*width] -
precalc[l+b*width] - precalc[r+t*width];
*pix=(unsigned char)(tot*mul);
pix += 4;
}
pix += (int)radius * 2 * 4;
}
}
}
cairo_surface_mark_dirty(surface);
free(precalc);
}
/*
* Initialize a new Context2d with the given canvas.
*/
NAN_METHOD(Context2d::New) {
if (!info.IsConstructCall()) {
return Nan::ThrowTypeError("Class constructors cannot be invoked without 'new'");
}
Local<Object> obj = info[0]->ToObject();
if (!Nan::New(Canvas::constructor)->HasInstance(obj))
return Nan::ThrowTypeError("Canvas expected");
Canvas *canvas = Nan::ObjectWrap::Unwrap<Canvas>(obj);
Context2d *context = new Context2d(canvas);
context->Wrap(info.This());
info.GetReturnValue().Set(info.This());
}
/*
* Create a new page.
*/
NAN_METHOD(Context2d::AddPage) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
if (!context->canvas()->isPDF()) {
return Nan::ThrowError("only PDF canvases support .nextPage()");
}
cairo_show_page(context->context());
return;
}
/*
* Put image data.
*
* - imageData, dx, dy
* - imageData, dx, dy, sx, sy, sw, sh
*
*/
NAN_METHOD(Context2d::PutImageData) {
if (!info[0]->IsObject())
return Nan::ThrowTypeError("ImageData expected");
Local<Object> obj = info[0]->ToObject();
if (!Nan::New(ImageData::constructor)->HasInstance(obj))
return Nan::ThrowTypeError("ImageData expected");
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
ImageData *imageData = Nan::ObjectWrap::Unwrap<ImageData>(obj);
uint8_t *src = imageData->data();
uint8_t *dst = context->canvas()->data();
int srcStride = imageData->stride()
, dstStride = context->canvas()->stride();
int sx = 0
, sy = 0
, sw = 0
, sh = 0
, dx = info[1]->Int32Value()
, dy = info[2]->Int32Value()
, rows
, cols;
switch (info.Length()) {
// imageData, dx, dy
case 3:
// Need to wrap std::min calls using parens to prevent macro expansion on
// windows. See http://stackoverflow.com/questions/5004858/stdmin-gives-error
cols = (std::min)(imageData->width(), context->canvas()->width - dx);
rows = (std::min)(imageData->height(), context->canvas()->height - dy);
break;
// imageData, dx, dy, sx, sy, sw, sh
case 7:
sx = info[3]->Int32Value();
sy = info[4]->Int32Value();
sw = info[5]->Int32Value();
sh = info[6]->Int32Value();
// fix up negative height, width
if (sw < 0) sx += sw, sw = -sw;
if (sh < 0) sy += sh, sh = -sh;
// clamp the left edge
if (sx < 0) sw += sx, sx = 0;
if (sy < 0) sh += sy, sy = 0;
// clamp the right edge
if (sx + sw > imageData->width()) sw = imageData->width() - sx;
if (sy + sh > imageData->height()) sh = imageData->height() - sy;
// start destination at source offset
dx += sx;
dy += sy;
// chop off outlying source data
if (dx < 0) sw += dx, sx -= dx, dx = 0;
if (dy < 0) sh += dy, sy -= dy, dy = 0;
// clamp width at canvas size
// Need to wrap std::min calls using parens to prevent macro expansion on
// windows. See http://stackoverflow.com/questions/5004858/stdmin-gives-error
cols = (std::min)(sw, context->canvas()->width - dx);
rows = (std::min)(sh, context->canvas()->height - dy);
break;
default:
return Nan::ThrowError("invalid arguments");
}
if (cols <= 0 || rows <= 0) return;
src += sy * srcStride + sx * 4;
dst += dstStride * dy + 4 * dx;
for (int y = 0; y < rows; ++y) {
uint8_t *dstRow = dst;
uint8_t *srcRow = src;
for (int x = 0; x < cols; ++x) {
// rgba
uint8_t r = *srcRow++;
uint8_t g = *srcRow++;
uint8_t b = *srcRow++;
uint8_t a = *srcRow++;
// argb
// performance optimization: fully transparent/opaque pixels can be
// processed more efficiently.
if (a == 0) {
*dstRow++ = 0;
*dstRow++ = 0;
*dstRow++ = 0;
*dstRow++ = 0;
} else if (a == 255) {
*dstRow++ = b;
*dstRow++ = g;
*dstRow++ = r;
*dstRow++ = a;
} else {
float alpha = (float)a / 255;
*dstRow++ = b * alpha;
*dstRow++ = g * alpha;
*dstRow++ = r * alpha;
*dstRow++ = a;
}
}
dst += dstStride;
src += srcStride;
}
cairo_surface_mark_dirty_rectangle(
context->canvas()->surface()
, dx
, dy
, cols
, rows);
}
/*
* Get image data.
*
* - sx, sy, sw, sh
*
*/
NAN_METHOD(Context2d::GetImageData) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
Canvas *canvas = context->canvas();
int sx = info[0]->Int32Value();
int sy = info[1]->Int32Value();
int sw = info[2]->Int32Value();
int sh = info[3]->Int32Value();
if (!sw)
return Nan::ThrowError("IndexSizeError: The source width is 0.");
if (!sh)
return Nan::ThrowError("IndexSizeError: The source height is 0.");
// WebKit and Firefox have this behavior:
// Flip the coordinates so the origin is top/left-most:
if (sw < 0) {
sx += sw;
sw = -sw;
}
if (sh < 0) {
sy += sh;
sh = -sh;
}
if (sx + sw > canvas->width) sw = canvas->width - sx;
if (sy + sh > canvas->height) sh = canvas->height - sy;
// WebKit/moz functionality. node-canvas used to return in either case.
if (sw <= 0) sw = 1;
if (sh <= 0) sh = 1;
// Non-compliant. "Pixels outside the canvas must be returned as transparent
// black." This instead clips the returned array to the canvas area.
if (sx < 0) {
sw += sx;
sx = 0;
}
if (sy < 0) {
sh += sy;
sy = 0;
}
int size = sw * sh * 4;
int srcStride = canvas->stride();
int dstStride = sw * 4;
uint8_t *src = canvas->data();
#if NODE_MAJOR_VERSION == 0 && NODE_MINOR_VERSION <= 10
Local<Object> global = Context::GetCurrent()->Global();
Local<Int32> sizeHandle = Nan::New(size);
Local<Value> caargv[] = { sizeHandle };
Local<Object> clampedArray = global->Get(Nan::New("Uint8ClampedArray").ToLocalChecked()).As<Function>()->NewInstance(1, caargv);
#else
Local<ArrayBuffer> buffer = ArrayBuffer::New(Isolate::GetCurrent(), size);
Local<Uint8ClampedArray> clampedArray = Uint8ClampedArray::New(buffer, 0, size);
#endif
Nan::TypedArrayContents<uint8_t> typedArrayContents(clampedArray);
uint8_t* dst = *typedArrayContents;
// Normalize data (argb -> rgba)
for (int y = 0; y < sh; ++y) {
uint32_t *row = (uint32_t *)(src + srcStride * (y + sy));
for (int x = 0; x < sw; ++x) {
int bx = x * 4;
uint32_t *pixel = row + x + sx;
uint8_t a = *pixel >> 24;
uint8_t r = *pixel >> 16;
uint8_t g = *pixel >> 8;
uint8_t b = *pixel;
dst[bx + 3] = a;
// Performance optimization: fully transparent/opaque pixels can be
// processed more efficiently.
if (a == 0 || a == 255) {
dst[bx + 0] = r;
dst[bx + 1] = g;
dst[bx + 2] = b;
} else {
float alpha = (float)a / 255;
dst[bx + 0] = (int)((float)r / alpha);
dst[bx + 1] = (int)((float)g / alpha);
dst[bx + 2] = (int)((float)b / alpha);
}
}
dst += dstStride;
}
const int argc = 3;
Local<Int32> swHandle = Nan::New(sw);
Local<Int32> shHandle = Nan::New(sh);
Local<Value> argv[argc] = { clampedArray, swHandle, shHandle };
Local<FunctionTemplate> cons = Nan::New(ImageData::constructor);
Local<Object> instance = cons->GetFunction()->NewInstance(argc, argv);
info.GetReturnValue().Set(instance);
}
/*
* Draw image src image to the destination (context).
*
* - dx, dy
* - dx, dy, dw, dh
* - sx, sy, sw, sh, dx, dy, dw, dh
*
*/
NAN_METHOD(Context2d::DrawImage) {
if (info.Length() < 3)
return Nan::ThrowTypeError("invalid arguments");
float sx = 0
, sy = 0
, sw = 0
, sh = 0
, dx, dy, dw, dh;
cairo_surface_t *surface;
Local<Object> obj = info[0]->ToObject();
// Image
if (Nan::New(Image::constructor)->HasInstance(obj)) {
Image *img = Nan::ObjectWrap::Unwrap<Image>(obj);
if (!img->isComplete()) {
return Nan::ThrowError("Image given has not completed loading");
}
sw = img->width;
sh = img->height;
surface = img->surface();
// Canvas
} else if (Nan::New(Canvas::constructor)->HasInstance(obj)) {
Canvas *canvas = Nan::ObjectWrap::Unwrap<Canvas>(obj);
sw = canvas->width;
sh = canvas->height;
surface = canvas->surface();
// Invalid
} else {
return Nan::ThrowTypeError("Image or Canvas expected");
}
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
// Arguments
switch (info.Length()) {
// img, sx, sy, sw, sh, dx, dy, dw, dh
case 9:
sx = info[1]->NumberValue();
sy = info[2]->NumberValue();
sw = info[3]->NumberValue();
sh = info[4]->NumberValue();
dx = info[5]->NumberValue();
dy = info[6]->NumberValue();
dw = info[7]->NumberValue();
dh = info[8]->NumberValue();
break;
// img, dx, dy, dw, dh
case 5:
dx = info[1]->NumberValue();
dy = info[2]->NumberValue();
dw = info[3]->NumberValue();
dh = info[4]->NumberValue();
break;
// img, dx, dy
case 3:
dx = info[1]->NumberValue();
dy = info[2]->NumberValue();
dw = sw;
dh = sh;
break;
default:
return Nan::ThrowTypeError("invalid arguments");
}
// Start draw
cairo_save(ctx);
// Scale src
float fx = (float) dw / sw;
float fy = (float) dh / sh;
if (dw != sw || dh != sh) {
cairo_scale(ctx, fx, fy);
dx /= fx;
dy /= fy;
dw /= fx;
dh /= fy;
}
// apply shadow if there is one
if (context->hasShadow()) {
if(context->state->shadowBlur) {
// we need to create a new surface in order to blur
int pad = context->state->shadowBlur * 2;
cairo_surface_t *shadow_surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, dw + 2 * pad, dh + 2 * pad);
cairo_t *shadow_context = cairo_create(shadow_surface);
// mask and blur
context->setSourceRGBA(shadow_context, context->state->shadow);
cairo_mask_surface(shadow_context, surface, pad, pad);
context->blur(shadow_surface, context->state->shadowBlur);
// paint
// @note: ShadowBlur looks different in each browser. This implementation matches chrome as close as possible.
// The 1.4 offset comes from visual tests with Chrome. I have read the spec and part of the shadowBlur
// implementation, and its not immediately clear why an offset is necessary, but without it, the result
// in chrome is different.
cairo_set_source_surface(ctx, shadow_surface,
dx - sx + (context->state->shadowOffsetX / fx) - pad + 1.4,
dy - sy + (context->state->shadowOffsetY / fy) - pad + 1.4);
cairo_paint(ctx);
// cleanup
cairo_destroy(shadow_context);
cairo_surface_destroy(shadow_surface);
} else {
context->setSourceRGBA(context->state->shadow);
cairo_mask_surface(ctx, surface,
dx - sx + (context->state->shadowOffsetX / fx),
dy - sy + (context->state->shadowOffsetY / fy));
}
}
context->savePath();
cairo_rectangle(ctx, dx, dy, dw, dh);
cairo_clip(ctx);
context->restorePath();
// Paint
cairo_set_source_surface(ctx, surface, dx - sx, dy - sy);
cairo_pattern_set_filter(cairo_get_source(ctx), context->state->patternQuality);
cairo_paint_with_alpha(ctx, context->state->globalAlpha);
cairo_restore(ctx);
}
/*
* Get global alpha.
*/
NAN_GETTER(Context2d::GetGlobalAlpha) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
info.GetReturnValue().Set(Nan::New<Number>(context->state->globalAlpha));
}
/*
* Set global alpha.
*/
NAN_SETTER(Context2d::SetGlobalAlpha) {
double n = value->NumberValue();
if (n >= 0 && n <= 1) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->state->globalAlpha = n;
}
}
/*
* Get global composite operation.
*/
NAN_GETTER(Context2d::GetGlobalCompositeOperation) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
const char *op = "source-over";
switch (cairo_get_operator(ctx)) {
case CAIRO_OPERATOR_ATOP: op = "source-atop"; break;
case CAIRO_OPERATOR_IN: op = "source-in"; break;
case CAIRO_OPERATOR_OUT: op = "source-out"; break;
case CAIRO_OPERATOR_XOR: op = "xor"; break;
case CAIRO_OPERATOR_DEST_ATOP: op = "destination-atop"; break;
case CAIRO_OPERATOR_DEST_IN: op = "destination-in"; break;
case CAIRO_OPERATOR_DEST_OUT: op = "destination-out"; break;
case CAIRO_OPERATOR_DEST_OVER: op = "destination-over"; break;
case CAIRO_OPERATOR_CLEAR: op = "clear"; break;
case CAIRO_OPERATOR_SOURCE: op = "source"; break;
case CAIRO_OPERATOR_DEST: op = "dest"; break;
case CAIRO_OPERATOR_OVER: op = "over"; break;
case CAIRO_OPERATOR_SATURATE: op = "saturate"; break;
// Non-standard
// supported by resent versions of cairo
#if CAIRO_VERSION_MINOR >= 10
case CAIRO_OPERATOR_LIGHTEN: op = "lighten"; break;
case CAIRO_OPERATOR_ADD: op = "add"; break;
case CAIRO_OPERATOR_DARKEN: op = "darker"; break;
case CAIRO_OPERATOR_MULTIPLY: op = "multiply"; break;
case CAIRO_OPERATOR_SCREEN: op = "screen"; break;
case CAIRO_OPERATOR_OVERLAY: op = "overlay"; break;
case CAIRO_OPERATOR_HARD_LIGHT: op = "hard-light"; break;
case CAIRO_OPERATOR_SOFT_LIGHT: op = "soft-light"; break;
case CAIRO_OPERATOR_HSL_HUE: op = "hsl-hue"; break;
case CAIRO_OPERATOR_HSL_SATURATION: op = "hsl-saturation"; break;
case CAIRO_OPERATOR_HSL_COLOR: op = "hsl-color"; break;
case CAIRO_OPERATOR_HSL_LUMINOSITY: op = "hsl-luminosity"; break;
case CAIRO_OPERATOR_COLOR_DODGE: op = "color-dodge"; break;
case CAIRO_OPERATOR_COLOR_BURN: op = "color-burn"; break;
case CAIRO_OPERATOR_DIFFERENCE: op = "difference"; break;
case CAIRO_OPERATOR_EXCLUSION: op = "exclusion"; break;
#else
case CAIRO_OPERATOR_ADD: op = "lighter"; break;
#endif
}
info.GetReturnValue().Set(Nan::New(op).ToLocalChecked());
}
/*
* Set pattern quality.
*/
NAN_SETTER(Context2d::SetPatternQuality) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
String::Utf8Value quality(value->ToString());
if (0 == strcmp("fast", *quality)) {
context->state->patternQuality = CAIRO_FILTER_FAST;
} else if (0 == strcmp("good", *quality)) {
context->state->patternQuality = CAIRO_FILTER_GOOD;
} else if (0 == strcmp("best", *quality)) {
context->state->patternQuality = CAIRO_FILTER_BEST;
} else if (0 == strcmp("nearest", *quality)) {
context->state->patternQuality = CAIRO_FILTER_NEAREST;
} else if (0 == strcmp("bilinear", *quality)) {
context->state->patternQuality = CAIRO_FILTER_BILINEAR;
}
}
/*
* Get pattern quality.
*/
NAN_GETTER(Context2d::GetPatternQuality) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
const char *quality;
switch (context->state->patternQuality) {
case CAIRO_FILTER_FAST: quality = "fast"; break;
case CAIRO_FILTER_BEST: quality = "best"; break;
case CAIRO_FILTER_NEAREST: quality = "nearest"; break;
case CAIRO_FILTER_BILINEAR: quality = "bilinear"; break;
default: quality = "good";
}
info.GetReturnValue().Set(Nan::New(quality).ToLocalChecked());
}
/*
* Set global composite operation.
*/
NAN_SETTER(Context2d::SetGlobalCompositeOperation) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
String::Utf8Value type(value->ToString());
if (0 == strcmp("xor", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_XOR);
} else if (0 == strcmp("source-atop", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_ATOP);
} else if (0 == strcmp("source-in", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_IN);
} else if (0 == strcmp("source-out", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_OUT);
} else if (0 == strcmp("destination-atop", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_DEST_ATOP);
} else if (0 == strcmp("destination-in", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_DEST_IN);
} else if (0 == strcmp("destination-out", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_DEST_OUT);
} else if (0 == strcmp("destination-over", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_DEST_OVER);
} else if (0 == strcmp("clear", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_CLEAR);
} else if (0 == strcmp("source", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_SOURCE);
} else if (0 == strcmp("dest", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_DEST);
} else if (0 == strcmp("saturate", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_SATURATE);
} else if (0 == strcmp("over", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_OVER);
// Non-standard
// supported by resent versions of cairo
#if CAIRO_VERSION_MINOR >= 10
} else if (0 == strcmp("add", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_ADD);
} else if (0 == strcmp("lighten", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_LIGHTEN);
} else if (0 == strcmp("darker", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_DARKEN);
} else if (0 == strcmp("multiply", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_MULTIPLY);
} else if (0 == strcmp("screen", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_SCREEN);
} else if (0 == strcmp("overlay", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_OVERLAY);
} else if (0 == strcmp("hard-light", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_HARD_LIGHT);
} else if (0 == strcmp("soft-light", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_SOFT_LIGHT);
} else if (0 == strcmp("hsl-hue", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_HSL_HUE);
} else if (0 == strcmp("hsl-saturation", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_HSL_SATURATION);
} else if (0 == strcmp("hsl-color", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_HSL_COLOR);
} else if (0 == strcmp("hsl-luminosity", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_HSL_LUMINOSITY);
} else if (0 == strcmp("color-dodge", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_COLOR_DODGE);
} else if (0 == strcmp("color-burn", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_COLOR_BURN);
} else if (0 == strcmp("difference", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_DIFFERENCE);
} else if (0 == strcmp("exclusion", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_EXCLUSION);
#endif
} else if (0 == strcmp("lighter", *type)) {
cairo_set_operator(ctx, CAIRO_OPERATOR_ADD);
} else {
cairo_set_operator(ctx, CAIRO_OPERATOR_OVER);
}
}
/*
* Get shadow offset x.
*/
NAN_GETTER(Context2d::GetShadowOffsetX) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
info.GetReturnValue().Set(Nan::New<Number>(context->state->shadowOffsetX));
}
/*
* Set shadow offset x.
*/
NAN_SETTER(Context2d::SetShadowOffsetX) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->state->shadowOffsetX = value->NumberValue();
}
/*
* Get shadow offset y.
*/
NAN_GETTER(Context2d::GetShadowOffsetY) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
info.GetReturnValue().Set(Nan::New<Number>(context->state->shadowOffsetY));
}
/*
* Set shadow offset y.
*/
NAN_SETTER(Context2d::SetShadowOffsetY) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->state->shadowOffsetY = value->NumberValue();
}
/*
* Get shadow blur.
*/
NAN_GETTER(Context2d::GetShadowBlur) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
info.GetReturnValue().Set(Nan::New<Number>(context->state->shadowBlur));
}
/*
* Set shadow blur.
*/
NAN_SETTER(Context2d::SetShadowBlur) {
int n = value->NumberValue();
if (n >= 0) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->state->shadowBlur = n;
}
}
/*
* Get current antialiasing setting.
*/
NAN_GETTER(Context2d::GetAntiAlias) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
const char *aa;
switch (cairo_get_antialias(context->context())) {
case CAIRO_ANTIALIAS_NONE: aa = "none"; break;
case CAIRO_ANTIALIAS_GRAY: aa = "gray"; break;
case CAIRO_ANTIALIAS_SUBPIXEL: aa = "subpixel"; break;
default: aa = "default";
}
info.GetReturnValue().Set(Nan::New(aa).ToLocalChecked());
}
/*
* Set antialiasing.
*/
NAN_SETTER(Context2d::SetAntiAlias) {
String::Utf8Value str(value->ToString());
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
cairo_antialias_t a;
if (0 == strcmp("none", *str)) {
a = CAIRO_ANTIALIAS_NONE;
} else if (0 == strcmp("default", *str)) {
a = CAIRO_ANTIALIAS_DEFAULT;
} else if (0 == strcmp("gray", *str)) {
a = CAIRO_ANTIALIAS_GRAY;
} else if (0 == strcmp("subpixel", *str)) {
a = CAIRO_ANTIALIAS_SUBPIXEL;
} else {
a = cairo_get_antialias(ctx);
}
cairo_set_antialias(ctx, a);
}
/*
* Get text drawing mode.
*/
NAN_GETTER(Context2d::GetTextDrawingMode) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
const char *mode;
if (context->state->textDrawingMode == TEXT_DRAW_PATHS) {
mode = "path";
} else if (context->state->textDrawingMode == TEXT_DRAW_GLYPHS) {
mode = "glyph";
} else {
mode = "unknown";
}
info.GetReturnValue().Set(Nan::New(mode).ToLocalChecked());
}
/*
* Set text drawing mode.
*/
NAN_SETTER(Context2d::SetTextDrawingMode) {
String::Utf8Value str(value->ToString());
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
if (0 == strcmp("path", *str)) {
context->state->textDrawingMode = TEXT_DRAW_PATHS;
} else if (0 == strcmp("glyph", *str)) {
context->state->textDrawingMode = TEXT_DRAW_GLYPHS;
}
}
/*
* Get filter.
*/
NAN_GETTER(Context2d::GetFilter) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
const char *filter;
switch (cairo_pattern_get_filter(cairo_get_source(context->context()))) {
case CAIRO_FILTER_FAST: filter = "fast"; break;
case CAIRO_FILTER_BEST: filter = "best"; break;
case CAIRO_FILTER_NEAREST: filter = "nearest"; break;
case CAIRO_FILTER_BILINEAR: filter = "bilinear"; break;
default: filter = "good";
}
info.GetReturnValue().Set(Nan::New(filter).ToLocalChecked());
}
/*
* Set filter.
*/
NAN_SETTER(Context2d::SetFilter) {
String::Utf8Value str(value->ToString());
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_filter_t filter;
if (0 == strcmp("fast", *str)) {
filter = CAIRO_FILTER_FAST;
} else if (0 == strcmp("best", *str)) {
filter = CAIRO_FILTER_BEST;
} else if (0 == strcmp("nearest", *str)) {
filter = CAIRO_FILTER_NEAREST;
} else if (0 == strcmp("bilinear", *str)) {
filter = CAIRO_FILTER_BILINEAR;
} else {
filter = CAIRO_FILTER_GOOD;
}
cairo_pattern_set_filter(cairo_get_source(context->context()), filter);
}
/*
* Get miter limit.
*/
NAN_GETTER(Context2d::GetMiterLimit) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
info.GetReturnValue().Set(Nan::New<Number>(cairo_get_miter_limit(context->context())));
}
/*
* Set miter limit.
*/
NAN_SETTER(Context2d::SetMiterLimit) {
double n = value->NumberValue();
if (n > 0) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_set_miter_limit(context->context(), n);
}
}
/*
* Get line width.
*/
NAN_GETTER(Context2d::GetLineWidth) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
info.GetReturnValue().Set(Nan::New<Number>(cairo_get_line_width(context->context())));
}
/*
* Set line width.
*/
NAN_SETTER(Context2d::SetLineWidth) {
double n = value->NumberValue();
if (n > 0 && n != std::numeric_limits<double>::infinity()) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_set_line_width(context->context(), n);
}
}
/*
* Get line join.
*/
NAN_GETTER(Context2d::GetLineJoin) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
const char *join;
switch (cairo_get_line_join(context->context())) {
case CAIRO_LINE_JOIN_BEVEL: join = "bevel"; break;
case CAIRO_LINE_JOIN_ROUND: join = "round"; break;
default: join = "miter";
}
info.GetReturnValue().Set(Nan::New(join).ToLocalChecked());
}
/*
* Set line join.
*/
NAN_SETTER(Context2d::SetLineJoin) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
String::Utf8Value type(value->ToString());
if (0 == strcmp("round", *type)) {
cairo_set_line_join(ctx, CAIRO_LINE_JOIN_ROUND);
} else if (0 == strcmp("bevel", *type)) {
cairo_set_line_join(ctx, CAIRO_LINE_JOIN_BEVEL);
} else {
cairo_set_line_join(ctx, CAIRO_LINE_JOIN_MITER);
}
}
/*
* Get line cap.
*/
NAN_GETTER(Context2d::GetLineCap) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
const char *cap;
switch (cairo_get_line_cap(context->context())) {
case CAIRO_LINE_CAP_ROUND: cap = "round"; break;
case CAIRO_LINE_CAP_SQUARE: cap = "square"; break;
default: cap = "butt";
}
info.GetReturnValue().Set(Nan::New(cap).ToLocalChecked());
}
/*
* Set line cap.
*/
NAN_SETTER(Context2d::SetLineCap) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
String::Utf8Value type(value->ToString());
if (0 == strcmp("round", *type)) {
cairo_set_line_cap(ctx, CAIRO_LINE_CAP_ROUND);
} else if (0 == strcmp("square", *type)) {
cairo_set_line_cap(ctx, CAIRO_LINE_CAP_SQUARE);
} else {
cairo_set_line_cap(ctx, CAIRO_LINE_CAP_BUTT);
}
}
/*
* Check if the given point is within the current path.
*/
NAN_METHOD(Context2d::IsPointInPath) {
if (info[0]->IsNumber() && info[1]->IsNumber()) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
double x = info[0]->NumberValue()
, y = info[1]->NumberValue();
context->setFillRule(info[2]);
info.GetReturnValue().Set(Nan::New<Boolean>(cairo_in_fill(ctx, x, y) || cairo_in_stroke(ctx, x, y)));
return;
}
info.GetReturnValue().Set(Nan::False());
}
/*
* Set fill pattern, useV internally for fillStyle=
*/
NAN_METHOD(Context2d::SetFillPattern) {
Local<Object> obj = info[0]->ToObject();
if (Nan::New(Gradient::constructor)->HasInstance(obj)){
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
Gradient *grad = Nan::ObjectWrap::Unwrap<Gradient>(obj);
context->state->fillGradient = grad->pattern();
} else if(Nan::New(Pattern::constructor)->HasInstance(obj)){
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
Pattern *pattern = Nan::ObjectWrap::Unwrap<Pattern>(obj);
context->state->fillPattern = pattern->pattern();
} else {
return Nan::ThrowTypeError("Gradient or Pattern expected");
}
}
/*
* Set stroke pattern, used internally for strokeStyle=
*/
NAN_METHOD(Context2d::SetStrokePattern) {
Local<Object> obj = info[0]->ToObject();
if (Nan::New(Gradient::constructor)->HasInstance(obj)){
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
Gradient *grad = Nan::ObjectWrap::Unwrap<Gradient>(obj);
context->state->strokeGradient = grad->pattern();
} else if(Nan::New(Pattern::constructor)->HasInstance(obj)){
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
Pattern *pattern = Nan::ObjectWrap::Unwrap<Pattern>(obj);
context->state->strokePattern = pattern->pattern();
} else {
return Nan::ThrowTypeError("Gradient or Pattern expected");
}
}
/*
* Set shadow color.
*/
NAN_SETTER(Context2d::SetShadowColor) {
short ok;
String::Utf8Value str(value->ToString());
uint32_t rgba = rgba_from_string(*str, &ok);
if (ok) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->state->shadow = rgba_create(rgba);
}
}
/*
* Get shadow color.
*/
NAN_GETTER(Context2d::GetShadowColor) {
char buf[64];
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
rgba_to_string(context->state->shadow, buf, sizeof(buf));
info.GetReturnValue().Set(Nan::New<String>(buf).ToLocalChecked());
}
/*
* Set fill color, used internally for fillStyle=
*/
NAN_METHOD(Context2d::SetFillColor) {
short ok;
if (!info[0]->IsString()) return;
String::Utf8Value str(info[0]);
uint32_t rgba = rgba_from_string(*str, &ok);
if (!ok) return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->state->fillPattern = context->state->fillGradient = NULL;
context->state->fill = rgba_create(rgba);
}
/*
* Get fill color.
*/
NAN_GETTER(Context2d::GetFillColor) {
char buf[64];
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
rgba_to_string(context->state->fill, buf, sizeof(buf));
info.GetReturnValue().Set(Nan::New<String>(buf).ToLocalChecked());
}
/*
* Set stroke color, used internally for strokeStyle=
*/
NAN_METHOD(Context2d::SetStrokeColor) {
short ok;
if (!info[0]->IsString()) return;
String::Utf8Value str(info[0]);
uint32_t rgba = rgba_from_string(*str, &ok);
if (!ok) return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->state->strokePattern = context->state->strokeGradient = NULL;
context->state->stroke = rgba_create(rgba);
}
/*
* Get stroke color.
*/
NAN_GETTER(Context2d::GetStrokeColor) {
char buf[64];
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
rgba_to_string(context->state->stroke, buf, sizeof(buf));
info.GetReturnValue().Set(Nan::New<String>(buf).ToLocalChecked());
}
/*
* Bezier curve.
*/
NAN_METHOD(Context2d::BezierCurveTo) {
if (!info[0]->IsNumber()
||!info[1]->IsNumber()
||!info[2]->IsNumber()
||!info[3]->IsNumber()
||!info[4]->IsNumber()
||!info[5]->IsNumber()) return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_curve_to(context->context()
, info[0]->NumberValue()
, info[1]->NumberValue()
, info[2]->NumberValue()
, info[3]->NumberValue()
, info[4]->NumberValue()
, info[5]->NumberValue());
}
/*
* Quadratic curve approximation from libsvg-cairo.
*/
NAN_METHOD(Context2d::QuadraticCurveTo) {
if (!info[0]->IsNumber()
||!info[1]->IsNumber()
||!info[2]->IsNumber()
||!info[3]->IsNumber()) return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
double x, y
, x1 = info[0]->NumberValue()
, y1 = info[1]->NumberValue()
, x2 = info[2]->NumberValue()
, y2 = info[3]->NumberValue();
cairo_get_current_point(ctx, &x, &y);
if (0 == x && 0 == y) {
x = x1;
y = y1;
}
cairo_curve_to(ctx
, x + 2.0 / 3.0 * (x1 - x), y + 2.0 / 3.0 * (y1 - y)
, x2 + 2.0 / 3.0 * (x1 - x2), y2 + 2.0 / 3.0 * (y1 - y2)
, x2
, y2);
}
/*
* Save state.
*/
NAN_METHOD(Context2d::Save) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->save();
}
/*
* Restore state.
*/
NAN_METHOD(Context2d::Restore) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->restore();
}
/*
* Creates a new subpath.
*/
NAN_METHOD(Context2d::BeginPath) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_new_path(context->context());
}
/*
* Marks the subpath as closed.
*/
NAN_METHOD(Context2d::ClosePath) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_close_path(context->context());
}
/*
* Rotate transformation.
*/
NAN_METHOD(Context2d::Rotate) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_rotate(context->context()
, info[0]->IsNumber() ? info[0]->NumberValue() : 0);
}
/*
* Modify the CTM.
*/
NAN_METHOD(Context2d::Transform) {
cairo_matrix_t matrix;
cairo_matrix_init(&matrix
, info[0]->IsNumber() ? info[0]->NumberValue() : 0
, info[1]->IsNumber() ? info[1]->NumberValue() : 0
, info[2]->IsNumber() ? info[2]->NumberValue() : 0
, info[3]->IsNumber() ? info[3]->NumberValue() : 0
, info[4]->IsNumber() ? info[4]->NumberValue() : 0
, info[5]->IsNumber() ? info[5]->NumberValue() : 0);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_transform(context->context(), &matrix);
}
/*
* Reset the CTM, used internally by setTransform().
*/
NAN_METHOD(Context2d::ResetTransform) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_identity_matrix(context->context());
}
/*
* Translate transformation.
*/
NAN_METHOD(Context2d::Translate) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_translate(context->context()
, info[0]->IsNumber() ? info[0]->NumberValue() : 0
, info[1]->IsNumber() ? info[1]->NumberValue() : 0);
}
/*
* Scale transformation.
*/
NAN_METHOD(Context2d::Scale) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_scale(context->context()
, info[0]->IsNumber() ? info[0]->NumberValue() : 0
, info[1]->IsNumber() ? info[1]->NumberValue() : 0);
}
/*
* Use path as clipping region.
*/
NAN_METHOD(Context2d::Clip) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->setFillRule(info[0]);
cairo_t *ctx = context->context();
cairo_clip_preserve(ctx);
}
/*
* Fill the path.
*/
NAN_METHOD(Context2d::Fill) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->setFillRule(info[0]);
context->fill(true);
}
/*
* Stroke the path.
*/
NAN_METHOD(Context2d::Stroke) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->stroke(true);
}
/*
* Fill text at (x, y).
*/
NAN_METHOD(Context2d::FillText) {
if (!info[1]->IsNumber()
|| !info[2]->IsNumber()) return;
String::Utf8Value str(info[0]->ToString());
double x = info[1]->NumberValue();
double y = info[2]->NumberValue();
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->savePath();
if (context->state->textDrawingMode == TEXT_DRAW_GLYPHS) {
context->fill();
context->setTextPath(*str, x, y);
} else if (context->state->textDrawingMode == TEXT_DRAW_PATHS) {
context->setTextPath(*str, x, y);
context->fill();
}
context->restorePath();
}
/*
* Stroke text at (x ,y).
*/
NAN_METHOD(Context2d::StrokeText) {
if (!info[1]->IsNumber()
|| !info[2]->IsNumber()) return;
String::Utf8Value str(info[0]->ToString());
double x = info[1]->NumberValue();
double y = info[2]->NumberValue();
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->savePath();
if (context->state->textDrawingMode == TEXT_DRAW_GLYPHS) {
context->stroke();
context->setTextPath(*str, x, y);
} else if (context->state->textDrawingMode == TEXT_DRAW_PATHS) {
context->setTextPath(*str, x, y);
context->stroke();
}
context->restorePath();
}
/*
* Set text path for the given string at (x, y).
*/
void
Context2d::setTextPath(const char *str, double x, double y) {
#if HAVE_PANGO
PangoRectangle ink_rect, logical_rect;
PangoFontMetrics *metrics = NULL;
pango_layout_set_text(_layout, str, -1);
pango_cairo_update_layout(_context, _layout);
switch (state->textAlignment) {
// center
case 0:
pango_layout_get_pixel_extents(_layout, &ink_rect, &logical_rect);
x -= logical_rect.width / 2;
break;
// right
case 1:
pango_layout_get_pixel_extents(_layout, &ink_rect, &logical_rect);
x -= logical_rect.width;
break;
}
switch (state->textBaseline) {
case TEXT_BASELINE_ALPHABETIC:
metrics = PANGO_LAYOUT_GET_METRICS(_layout);
y -= pango_font_metrics_get_ascent(metrics) / PANGO_SCALE;
break;
case TEXT_BASELINE_MIDDLE:
metrics = PANGO_LAYOUT_GET_METRICS(_layout);
y -= (pango_font_metrics_get_ascent(metrics) + pango_font_metrics_get_descent(metrics))/(2.0 * PANGO_SCALE);
break;
case TEXT_BASELINE_BOTTOM:
metrics = PANGO_LAYOUT_GET_METRICS(_layout);
y -= (pango_font_metrics_get_ascent(metrics) + pango_font_metrics_get_descent(metrics)) / PANGO_SCALE;
break;
}
if (metrics) pango_font_metrics_unref(metrics);
cairo_move_to(_context, x, y);
if (state->textDrawingMode == TEXT_DRAW_PATHS) {
pango_cairo_layout_path(_context, _layout);
} else if (state->textDrawingMode == TEXT_DRAW_GLYPHS) {
pango_cairo_show_layout(_context, _layout);
}
#else
cairo_text_extents_t te;
cairo_font_extents_t fe;
// Alignment
switch (state->textAlignment) {
// center
case 0:
// Olaf (2011-02-19): te.x_bearing does not concern the alignment
cairo_text_extents(_context, str, &te);
x -= te.width / 2;
break;
// right
case 1:
// Olaf (2011-02-19): te.x_bearing does not concern the alignment
cairo_text_extents(_context, str, &te);
x -= te.width;
break;
}
// Baseline approx
switch (state->textBaseline) {
case TEXT_BASELINE_TOP:
case TEXT_BASELINE_HANGING:
// Olaf (2011-02-26): fe.ascent approximates the distance between
// the top of the em square and the alphabetic baseline
cairo_font_extents(_context, &fe);
y += fe.ascent;
break;
case TEXT_BASELINE_MIDDLE:
// Olaf (2011-02-26): fe.ascent approximates the distance between
// the top of the em square and the alphabetic baseline
cairo_font_extents(_context, &fe);
y += (fe.ascent - fe.descent)/2;
break;
case TEXT_BASELINE_BOTTOM:
// Olaf (2011-02-26): we need to know the distance between the alphabetic
// baseline and the bottom of the em square
cairo_font_extents(_context, &fe);
y -= fe.descent;
break;
}
cairo_move_to(_context, x, y);
if (state->textDrawingMode == TEXT_DRAW_PATHS) {
cairo_text_path(_context, str);
} else if (state->textDrawingMode == TEXT_DRAW_GLYPHS) {
cairo_show_text(_context, str);
}
#endif
}
/*
* Adds a point to the current subpath.
*/
NAN_METHOD(Context2d::LineTo) {
if (!info[0]->IsNumber())
return Nan::ThrowTypeError("lineTo() x must be a number");
if (!info[1]->IsNumber())
return Nan::ThrowTypeError("lineTo() y must be a number");
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_line_to(context->context()
, info[0]->NumberValue()
, info[1]->NumberValue());
}
/*
* Creates a new subpath at the given point.
*/
NAN_METHOD(Context2d::MoveTo) {
if (!info[0]->IsNumber())
return Nan::ThrowTypeError("moveTo() x must be a number");
if (!info[1]->IsNumber())
return Nan::ThrowTypeError("moveTo() y must be a number");
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_move_to(context->context()
, info[0]->NumberValue()
, info[1]->NumberValue());
}
/*
* Set font face.
*/
#ifdef HAVE_FREETYPE
NAN_METHOD(Context2d::SetFontFace) {
// Ignore invalid args
if (!info[0]->IsObject()
|| !info[1]->IsNumber())
return Nan::ThrowTypeError("Expected object and number");
Local<Object> obj = info[0]->ToObject();
if (!Nan::New(FontFace::constructor)->HasInstance(obj))
return Nan::ThrowTypeError("FontFace expected");
FontFace *face = Nan::ObjectWrap::Unwrap<FontFace>(obj);
double size = info[1]->NumberValue();
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
cairo_set_font_size(ctx, size);
cairo_set_font_face(ctx, face->cairoFace());
return;
}
#endif
/*
* Set font:
* - weight
* - style
* - size
* - unit
* - family
*/
NAN_METHOD(Context2d::SetFont) {
// Ignore invalid args
if (!info[0]->IsString()
|| !info[1]->IsString()
|| !info[2]->IsNumber()
|| !info[3]->IsString()
|| !info[4]->IsString()) return;
String::Utf8Value weight(info[0]);
String::Utf8Value style(info[1]);
double size = info[2]->NumberValue();
String::Utf8Value unit(info[3]);
String::Utf8Value family(info[4]);
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
#if HAVE_PANGO
if (strlen(*family) > 0) state_assign_fontFamily(context->state, *family);
if (size > 0) context->state->fontSize = size;
PangoStyle s = PANGO_STYLE_NORMAL;
if (strlen(*style) > 0) {
if (0 == strcmp("italic", *style)) {
s = PANGO_STYLE_ITALIC;
} else if (0 == strcmp("oblique", *style)) {
s = PANGO_STYLE_OBLIQUE;
}
}
context->state->fontStyle = s;
PangoWeight w = PANGO_WEIGHT_NORMAL;
if (strlen(*weight) > 0) {
if (0 == strcmp("bold", *weight)) {
w = PANGO_WEIGHT_BOLD;
} else if (0 == strcmp("200", *weight)) {
w = PANGO_WEIGHT_ULTRALIGHT;
} else if (0 == strcmp("300", *weight)) {
w = PANGO_WEIGHT_LIGHT;
} else if (0 == strcmp("400", *weight)) {
w = PANGO_WEIGHT_NORMAL;
} else if (0 == strcmp("500", *weight)) {
w = PANGO_WEIGHT_MEDIUM;
} else if (0 == strcmp("600", *weight)) {
w = PANGO_WEIGHT_SEMIBOLD;
} else if (0 == strcmp("700", *weight)) {
w = PANGO_WEIGHT_BOLD;
} else if (0 == strcmp("800", *weight)) {
w = PANGO_WEIGHT_ULTRABOLD;
} else if (0 == strcmp("900", *weight)) {
w = PANGO_WEIGHT_HEAVY;
}
}
context->state->fontWeight = w;
context->setFontFromState();
#else
cairo_t *ctx = context->context();
// Size
cairo_set_font_size(ctx, size);
// Style
cairo_font_slant_t s = CAIRO_FONT_SLANT_NORMAL;
if (0 == strcmp("italic", *style)) {
s = CAIRO_FONT_SLANT_ITALIC;
} else if (0 == strcmp("oblique", *style)) {
s = CAIRO_FONT_SLANT_OBLIQUE;
}
// Weight
cairo_font_weight_t w = CAIRO_FONT_WEIGHT_NORMAL;
if (0 == strcmp("bold", *weight)) {
w = CAIRO_FONT_WEIGHT_BOLD;
}
cairo_select_font_face(ctx, *family, s, w);
#endif
}
#if HAVE_PANGO
/*
* Sets PangoLayout options from the current font state
*/
void
Context2d::setFontFromState() {
PangoFontDescription *fd = pango_font_description_new();
pango_font_description_set_family(fd, state->fontFamily);
pango_font_description_set_absolute_size(fd, state->fontSize * PANGO_SCALE);
pango_font_description_set_style(fd, state->fontStyle);
pango_font_description_set_weight(fd, state->fontWeight);
pango_layout_set_font_description(_layout, fd);
pango_font_description_free(fd);
}
#endif
/*
* Return the given text extents.
* TODO: Support for:
* hangingBaseline, ideographicBaseline,
* fontBoundingBoxAscent, fontBoundingBoxDescent
*/
NAN_METHOD(Context2d::MeasureText) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
String::Utf8Value str(info[0]->ToString());
Local<Object> obj = Nan::New<Object>();
#if HAVE_PANGO
PangoRectangle ink_rect, logical_rect;
PangoFontMetrics *metrics;
PangoLayout *layout = context->layout();
pango_layout_set_text(layout, *str, -1);
pango_cairo_update_layout(ctx, layout);
pango_layout_get_pixel_extents(layout, &ink_rect, &logical_rect);
metrics = PANGO_LAYOUT_GET_METRICS(layout);
double x_offset;
switch (context->state->textAlignment) {
case 0: // center
x_offset = logical_rect.width / 2;
break;
case 1: // right
x_offset = logical_rect.width;
break;
default: // left
x_offset = 0.0;
}
double y_offset;
switch (context->state->textBaseline) {
case TEXT_BASELINE_ALPHABETIC:
y_offset = -pango_font_metrics_get_ascent(metrics) / PANGO_SCALE;
break;
case TEXT_BASELINE_MIDDLE:
y_offset = -(pango_font_metrics_get_ascent(metrics) + pango_font_metrics_get_descent(metrics))/(2.0 * PANGO_SCALE);
break;
case TEXT_BASELINE_BOTTOM:
y_offset = -(pango_font_metrics_get_ascent(metrics) + pango_font_metrics_get_descent(metrics)) / PANGO_SCALE;
break;
default:
y_offset = 0.0;
}
obj->Set(Nan::New<String>("width").ToLocalChecked(),
Nan::New<Number>(logical_rect.width));
obj->Set(Nan::New<String>("actualBoundingBoxLeft").ToLocalChecked(),
Nan::New<Number>(x_offset - PANGO_LBEARING(logical_rect)));
obj->Set(Nan::New<String>("actualBoundingBoxRight").ToLocalChecked(),
Nan::New<Number>(x_offset + PANGO_RBEARING(logical_rect)));
obj->Set(Nan::New<String>("actualBoundingBoxAscent").ToLocalChecked(),
Nan::New<Number>(-(y_offset+ink_rect.y)));
obj->Set(Nan::New<String>("actualBoundingBoxDescent").ToLocalChecked(),
Nan::New<Number>((PANGO_DESCENT(ink_rect) + y_offset)));
obj->Set(Nan::New<String>("emHeightAscent").ToLocalChecked(),
Nan::New<Number>(PANGO_ASCENT(logical_rect) - y_offset));
obj->Set(Nan::New<String>("emHeightDescent").ToLocalChecked(),
Nan::New<Number>(PANGO_DESCENT(logical_rect) + y_offset));
obj->Set(Nan::New<String>("alphabeticBaseline").ToLocalChecked(),
Nan::New<Number>((pango_font_metrics_get_ascent(metrics) / PANGO_SCALE)
+ y_offset));
pango_font_metrics_unref(metrics);
#else
cairo_text_extents_t te;
cairo_font_extents_t fe;
cairo_text_extents(ctx, *str, &te);
cairo_font_extents(ctx, &fe);
double x_offset;
switch (context->state->textAlignment) {
case 0: // center
x_offset = te.width / 2;
break;
case 1: // right
x_offset = te.width;
break;
default: // left
x_offset = 0.0;
}
double y_offset;
switch (context->state->textBaseline) {
case TEXT_BASELINE_TOP:
case TEXT_BASELINE_HANGING:
y_offset = fe.ascent;
break;
case TEXT_BASELINE_MIDDLE:
y_offset = (fe.ascent - fe.descent)/2;
break;
case TEXT_BASELINE_BOTTOM:
y_offset = -fe.descent;
break;
default:
y_offset = 0.0;
}
obj->Set(Nan::New<String>("width").ToLocalChecked(),
Nan::New<Number>(te.x_advance));
obj->Set(Nan::New<String>("actualBoundingBoxLeft").ToLocalChecked(),
Nan::New<Number>(x_offset - te.x_bearing));
obj->Set(Nan::New<String>("actualBoundingBoxRight").ToLocalChecked(),
Nan::New<Number>((te.x_bearing + te.width) - x_offset));
obj->Set(Nan::New<String>("actualBoundingBoxAscent").ToLocalChecked(),
Nan::New<Number>(-(te.y_bearing + y_offset)));
obj->Set(Nan::New<String>("actualBoundingBoxDescent").ToLocalChecked(),
Nan::New<Number>(te.height + te.y_bearing + y_offset));
obj->Set(Nan::New<String>("emHeightAscent").ToLocalChecked(),
Nan::New<Number>(fe.ascent - y_offset));
obj->Set(Nan::New<String>("emHeightDescent").ToLocalChecked(),
Nan::New<Number>(fe.descent + y_offset));
obj->Set(Nan::New<String>("alphabeticBaseline").ToLocalChecked(),
Nan::New<Number>(y_offset));
#endif
info.GetReturnValue().Set(obj);
}
/*
* Set text baseline.
*/
NAN_METHOD(Context2d::SetTextBaseline) {
if (!info[0]->IsInt32()) return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->state->textBaseline = info[0]->Int32Value();
}
/*
* Set text alignment. -1 0 1
*/
NAN_METHOD(Context2d::SetTextAlignment) {
if (!info[0]->IsInt32()) return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
context->state->textAlignment = info[0]->Int32Value();
}
/*
* Set line dash
* ref: http://www.w3.org/TR/2dcontext/#dom-context-2d-setlinedash
*/
NAN_METHOD(Context2d::SetLineDash) {
if (!info[0]->IsArray()) return;
Local<Array> dash = Local<Array>::Cast(info[0]);
uint32_t dashes = dash->Length() & 1 ? dash->Length() * 2 : dash->Length();
std::vector<double> a(dashes);
for (uint32_t i=0; i<dashes; i++) {
Local<Value> d = dash->Get(i % dash->Length());
if (!d->IsNumber()) return;
a[i] = d->NumberValue();
if (a[i] < 0 || isnan(a[i]) || isinf(a[i])) return;
}
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
double offset;
cairo_get_dash(ctx, NULL, &offset);
cairo_set_dash(ctx, a.data(), dashes, offset);
}
/*
* Get line dash
* ref: http://www.w3.org/TR/2dcontext/#dom-context-2d-setlinedash
*/
NAN_METHOD(Context2d::GetLineDash) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
int dashes = cairo_get_dash_count(ctx);
std::vector<double> a(dashes);
cairo_get_dash(ctx, a.data(), NULL);
Local<Array> dash = Nan::New<Array>(dashes);
for (int i=0; i<dashes; i++)
dash->Set(Nan::New<Number>(i), Nan::New<Number>(a[i]));
info.GetReturnValue().Set(dash);
}
/*
* Set line dash offset
* ref: http://www.w3.org/TR/2dcontext/#dom-context-2d-setlinedash
*/
NAN_SETTER(Context2d::SetLineDashOffset) {
double offset = value->NumberValue();
if (isnan(offset) || isinf(offset)) return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
int dashes = cairo_get_dash_count(ctx);
std::vector<double> a(dashes);
cairo_get_dash(ctx, a.data(), NULL);
cairo_set_dash(ctx, a.data(), dashes, offset);
}
/*
* Get line dash offset
* ref: http://www.w3.org/TR/2dcontext/#dom-context-2d-setlinedash
*/
NAN_GETTER(Context2d::GetLineDashOffset) {
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
double offset;
cairo_get_dash(ctx, NULL, &offset);
info.GetReturnValue().Set(Nan::New<Number>(offset));
}
/*
* Fill the rectangle defined by x, y, width and height.
*/
NAN_METHOD(Context2d::FillRect) {
RECT_ARGS;
if (0 == width || 0 == height) return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
context->savePath();
cairo_rectangle(ctx, x, y, width, height);
context->fill();
context->restorePath();
}
/*
* Stroke the rectangle defined by x, y, width and height.
*/
NAN_METHOD(Context2d::StrokeRect) {
RECT_ARGS;
if (0 == width && 0 == height) return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
context->savePath();
cairo_rectangle(ctx, x, y, width, height);
context->stroke();
context->restorePath();
}
/*
* Clears all pixels defined by x, y, width and height.
*/
NAN_METHOD(Context2d::ClearRect) {
RECT_ARGS;
if (0 == width || 0 == height) return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
cairo_save(ctx);
context->savePath();
cairo_rectangle(ctx, x, y, width, height);
cairo_set_operator(ctx, CAIRO_OPERATOR_CLEAR);
cairo_fill(ctx);
context->restorePath();
cairo_restore(ctx);
}
/*
* Adds a rectangle subpath.
*/
NAN_METHOD(Context2d::Rect) {
RECT_ARGS;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
if (width == 0) {
cairo_move_to(ctx, x, y);
cairo_line_to(ctx, x, y + height);
} else if (height == 0) {
cairo_move_to(ctx, x, y);
cairo_line_to(ctx, x + width, y);
} else {
cairo_rectangle(ctx, x, y, width, height);
}
}
/*
* Adds an arc at x, y with the given radis and start/end angles.
*/
NAN_METHOD(Context2d::Arc) {
if (!info[0]->IsNumber()
|| !info[1]->IsNumber()
|| !info[2]->IsNumber()
|| !info[3]->IsNumber()
|| !info[4]->IsNumber()) return;
bool anticlockwise = info[5]->BooleanValue();
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
if (anticlockwise && M_PI * 2 != info[4]->NumberValue()) {
cairo_arc_negative(ctx
, info[0]->NumberValue()
, info[1]->NumberValue()
, info[2]->NumberValue()
, info[3]->NumberValue()
, info[4]->NumberValue());
} else {
cairo_arc(ctx
, info[0]->NumberValue()
, info[1]->NumberValue()
, info[2]->NumberValue()
, info[3]->NumberValue()
, info[4]->NumberValue());
}
}
/*
* Adds an arcTo point (x0,y0) to (x1,y1) with the given radius.
*
* Implementation influenced by WebKit.
*/
NAN_METHOD(Context2d::ArcTo) {
if (!info[0]->IsNumber()
|| !info[1]->IsNumber()
|| !info[2]->IsNumber()
|| !info[3]->IsNumber()
|| !info[4]->IsNumber()) return;
Context2d *context = Nan::ObjectWrap::Unwrap<Context2d>(info.This());
cairo_t *ctx = context->context();
// Current path point
double x, y;
cairo_get_current_point(ctx, &x, &y);
Point<float> p0(x, y);
// Point (x0,y0)
Point<float> p1(info[0]->NumberValue(), info[1]->NumberValue());
// Point (x1,y1)
Point<float> p2(info[2]->NumberValue(), info[3]->NumberValue());
float radius = info[4]->NumberValue();
if ((p1.x == p0.x && p1.y == p0.y)
|| (p1.x == p2.x && p1.y == p2.y)
|| radius == 0.f) {
cairo_line_to(ctx, p1.x, p1.y);
return;
}
Point<float> p1p0((p0.x - p1.x),(p0.y - p1.y));
Point<float> p1p2((p2.x - p1.x),(p2.y - p1.y));
float p1p0_length = sqrtf(p1p0.x * p1p0.x + p1p0.y * p1p0.y);
float p1p2_length = sqrtf(p1p2.x * p1p2.x + p1p2.y * p1p2.y);
double cos_phi = (p1p0.x * p1p2.x + p1p0.y * p1p2.y) / (p1p0_length * p1p2_length);
// all points on a line logic
if (-1 == cos_phi) {
cairo_line_to(ctx, p1.x, p1.y);
return;
}
if (1 == cos_phi) {
// add infinite far away point
unsigned int max_length = 65535;
double factor_max = max_length / p1p0_length;
Point<float> ep((p0.x + factor_max * p1p0.x), (p0.y + factor_max * p1p0.y));
cairo_line_to(ctx, ep.x, ep.y);
return;
}
float tangent = radius / tan(acos(cos_phi) / 2);
float factor_p1p0 = tangent / p1p0_length;
Point<float> t_p1p0((p1.x + factor_p1p0 * p1p0.x), (p1.y + factor_p1p0 * p1p0.y));
Point<float> orth_p1p0(p1p0.y, -p1p0.x);
float orth_p1p0_length = sqrt(orth_p1p0.x * orth_p1p0.x + orth_p1p0.y * orth_p1p0.y);
float factor_ra = radius / orth_p1p0_length;
double cos_alpha = (orth_p1p0.x * p1p2.x + orth_p1p0.y * p1p2.y) / (orth_p1p0_length * p1p2_length);
if (cos_alpha < 0.f)
orth_p1p0 = Point<float>(-orth_p1p0.x, -orth_p1p0.y);
Point<float> p((t_p1p0.x + factor_ra * orth_p1p0.x), (t_p1p0.y + factor_ra * orth_p1p0.y));
orth_p1p0 = Point<float>(-orth_p1p0.x, -orth_p1p0.y);
float sa = acos(orth_p1p0.x / orth_p1p0_length);
if (orth_p1p0.y < 0.f)
sa = 2 * M_PI - sa;
bool anticlockwise = false;
float factor_p1p2 = tangent / p1p2_length;
Point<float> t_p1p2((p1.x + factor_p1p2 * p1p2.x), (p1.y + factor_p1p2 * p1p2.y));
Point<float> orth_p1p2((t_p1p2.x - p.x),(t_p1p2.y - p.y));
float orth_p1p2_length = sqrtf(orth_p1p2.x * orth_p1p2.x + orth_p1p2.y * orth_p1p2.y);
float ea = acos(orth_p1p2.x / orth_p1p2_length);
if (orth_p1p2.y < 0) ea = 2 * M_PI - ea;
if ((sa > ea) && ((sa - ea) < M_PI)) anticlockwise = true;
if ((sa < ea) && ((ea - sa) > M_PI)) anticlockwise = true;
cairo_line_to(ctx, t_p1p0.x, t_p1p0.y);
if (anticlockwise && M_PI * 2 != radius) {
cairo_arc_negative(ctx
, p.x
, p.y
, radius
, sa
, ea);
} else {
cairo_arc(ctx
, p.x
, p.y
, radius
, sa
, ea);
}
}