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context_test.go
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context_test.go
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// Copyright 2020 Frederik Zipp. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package canvas
import (
"image"
"image/color"
"math"
"testing"
"github.com/google/go-cmp/cmp"
)
func TestContextDrawing(t *testing.T) {
tests := []struct {
name string
draw func(*Context)
want []byte
}{
{
"Arc",
func(ctx *Context) { ctx.Arc(5, 10, 15, 0, 0.75, true) },
[]byte{
0x01,
0x40, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x2e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x3f, 0xe8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x01,
},
},
{
"ArcTo",
func(ctx *Context) { ctx.ArcTo(100, 50, 80, 60, 25) },
[]byte{
0x02,
0x40, 0x59, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x49, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x54, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x4e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x39, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"BeginPath",
func(ctx *Context) { ctx.BeginPath() },
[]byte{0x03},
},
{
"BezierCurveTo",
func(ctx *Context) { ctx.BezierCurveTo(230, 30, 150, 80, 250, 100) },
[]byte{
0x04,
0x40, 0x6c, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x3e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x62, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x54, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x6f, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x59, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"ClearRect",
func(ctx *Context) { ctx.ClearRect(10, 20, 120, 80) },
[]byte{
0x05,
0x40, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x34, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x5e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x54, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"Clip",
func(ctx *Context) { ctx.Clip() },
[]byte{0x06},
},
{
"ClosePath",
func(ctx *Context) { ctx.ClosePath() },
[]byte{0x07},
},
{
"CreateImageData",
func(ctx *Context) {
img := image.NewRGBA(image.Rect(0, 0, 4, 3))
for i := range img.Pix {
img.Pix[i] = byte(i)
}
ctx.CreateImageData(img)
},
[]byte{
0x08,
0x00, 0x00, 0x00, 0x00, // ID
0x00, 0x00, 0x00, 0x04, // Width
0x00, 0x00, 0x00, 0x03, // Height
// Pixels
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
},
},
{
"CreateImageData: ID generation",
func(ctx *Context) {
ctx.CreateImageData(image.NewRGBA(image.Rect(0, 0, 0, 0)))
ctx.CreateImageData(image.NewRGBA(image.Rect(0, 0, 0, 0)))
ctx.CreateImageData(image.NewRGBA(image.Rect(0, 0, 0, 0)))
},
[]byte{
0x08, // CreateImageData
0x00, 0x00, 0x00, 0x00, // ID = 0
0x00, 0x00, 0x00, 0x00, // Width
0x00, 0x00, 0x00, 0x00, // Height
0x08, // CreateImageData
0x00, 0x00, 0x00, 0x01, // ID = 1
0x00, 0x00, 0x00, 0x00, // Width
0x00, 0x00, 0x00, 0x00, // Height
0x08, // CreateImageData
0x00, 0x00, 0x00, 0x02, // ID = 2
0x00, 0x00, 0x00, 0x00, // Width
0x00, 0x00, 0x00, 0x00, // Height
},
},
{
"Ellipse",
func(ctx *Context) { ctx.Ellipse(100, 80, 50, 75, math.Pi/4, 0, 2*math.Pi, true) },
[]byte{
0x0e,
0x40, 0x59, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x54, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x49, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x52, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00,
0x3f, 0xe9, 0x21, 0xfb, 0x54, 0x44, 0x2d, 0x18,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x19, 0x21, 0xfb, 0x54, 0x44, 0x2d, 0x18,
0x01,
},
},
{
"Fill",
func(ctx *Context) { ctx.Fill() },
[]byte{0x0f},
},
{
"FillRect",
func(ctx *Context) { ctx.FillRect(250, 120, 70, 65) },
[]byte{
0x10,
0x40, 0x6f, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x5e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x51, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x50, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"SetFillStyle",
func(ctx *Context) { ctx.SetFillStyle(color.RGBA{R: 10, G: 20, B: 30, A: 255}) },
[]byte{
0x11,
0x0a, 0x14, 0x1e, 0xff,
},
},
{
"SetFillStyleString",
func(ctx *Context) { ctx.SetFillStyleString("#0A141E") },
[]byte{
0x3b,
0x00, 0x00, 0x00, 0x07, // len(color)
0x23, 0x30, 0x41, 0x31, 0x34, 0x31, 0x45, // color
},
},
{
"SetFillStyleGradient",
func(ctx *Context) { ctx.SetFillStyleGradient(&Gradient{id: 5}) },
[]byte{
0x16,
0x00, 0x00, 0x00, 0x05,
},
},
{
"SetFillStylePattern",
func(ctx *Context) { ctx.SetFillStylePattern(&Pattern{id: 16}) },
[]byte{
0x42,
0x00, 0x00, 0x00, 0x10,
},
},
{
"FillText",
func(ctx *Context) { ctx.FillText("test äöü", 22, 38) },
[]byte{
0x12,
0x40, 0x36, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // x
0x40, 0x43, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // y
0x00, 0x00, 0x00, 0x0b, // len(text)
0x74, 0x65, 0x73, 0x74, 0x20, 0xc3, 0xa4, 0xc3, 0xb6, 0xc3, 0xbc, // text
},
},
{
"FillTextMaxWidth",
func(ctx *Context) { ctx.FillTextMaxWidth("Hello, 世界", 45, 52, 100) },
[]byte{
0x39,
0x40, 0x46, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, // x
0x40, 0x4a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // y
0x40, 0x59, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // maxWidth
0x00, 0x00, 0x00, 0x0d, // len(text)
0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x2c, 0x20, // text "Hello, "
0xe4, 0xb8, 0x96, 0xe7, 0x95, 0x8c, // text "世界"
},
},
{
"SetFont",
func(ctx *Context) { ctx.SetFont("Helvetica") },
[]byte{
0x13,
0x00, 0x00, 0x00, 0x09, // len(font)
0x48, 0x65, 0x6c, 0x76, 0x65, 0x74, 0x69, 0x63, 0x61, // font
},
},
{
"SetGlobalAlpha",
func(ctx *Context) { ctx.SetGlobalAlpha(0.5) },
[]byte{
0x17,
0x3f, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"SetGlobalCompositeOperation",
func(ctx *Context) {
ctx.SetGlobalCompositeOperation(OpSourceOver)
ctx.SetGlobalCompositeOperation(OpSourceIn)
ctx.SetGlobalCompositeOperation(OpSourceOut)
ctx.SetGlobalCompositeOperation(OpSourceAtop)
ctx.SetGlobalCompositeOperation(OpDestinationOver)
ctx.SetGlobalCompositeOperation(OpDestinationIn)
ctx.SetGlobalCompositeOperation(OpDestinationOut)
ctx.SetGlobalCompositeOperation(OpDestinationAtop)
ctx.SetGlobalCompositeOperation(OpLighter)
ctx.SetGlobalCompositeOperation(OpCopy)
ctx.SetGlobalCompositeOperation(OpXOR)
ctx.SetGlobalCompositeOperation(OpMultiply)
ctx.SetGlobalCompositeOperation(OpScreen)
ctx.SetGlobalCompositeOperation(OpOverlay)
ctx.SetGlobalCompositeOperation(OpDarken)
ctx.SetGlobalCompositeOperation(OpLighten)
ctx.SetGlobalCompositeOperation(OpColorDodge)
ctx.SetGlobalCompositeOperation(OpColorBurn)
ctx.SetGlobalCompositeOperation(OpHardLight)
ctx.SetGlobalCompositeOperation(OpSoftLight)
ctx.SetGlobalCompositeOperation(OpDifference)
ctx.SetGlobalCompositeOperation(OpExclusion)
ctx.SetGlobalCompositeOperation(OpHue)
ctx.SetGlobalCompositeOperation(OpSaturation)
ctx.SetGlobalCompositeOperation(OpColor)
ctx.SetGlobalCompositeOperation(OpLuminosity)
},
[]byte{
0x18, 0x00,
0x18, 0x01,
0x18, 0x02,
0x18, 0x03,
0x18, 0x04,
0x18, 0x05,
0x18, 0x06,
0x18, 0x07,
0x18, 0x08,
0x18, 0x09,
0x18, 0x0a,
0x18, 0x0b,
0x18, 0x0c,
0x18, 0x0d,
0x18, 0x0e,
0x18, 0x0f,
0x18, 0x10,
0x18, 0x11,
0x18, 0x12,
0x18, 0x13,
0x18, 0x14,
0x18, 0x15,
0x18, 0x16,
0x18, 0x17,
0x18, 0x18,
0x18, 0x19,
},
},
{
"SetImageSmoothingEnabled",
func(ctx *Context) {
ctx.SetImageSmoothingEnabled(false)
ctx.SetImageSmoothingEnabled(true)
},
[]byte{
0x19, 0x00,
0x19, 0x01,
},
},
{
"SetLineCap",
func(ctx *Context) {
ctx.SetLineCap(CapButt)
ctx.SetLineCap(CapRound)
ctx.SetLineCap(CapSquare)
},
[]byte{
0x1c, 0x00,
0x1c, 0x01,
0x1c, 0x02,
},
},
{
"SetLineDashOffset",
func(ctx *Context) { ctx.SetLineDashOffset(0.3) },
[]byte{
0x1d,
0x3f, 0xd3, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33,
},
},
{
"SetLineJoin",
func(ctx *Context) {
ctx.SetLineJoin(JoinMiter)
ctx.SetLineJoin(JoinRound)
ctx.SetLineJoin(JoinBevel)
},
[]byte{
0x1e, 0x00,
0x1e, 0x01,
0x1e, 0x02,
},
},
{
"LineTo",
func(ctx *Context) { ctx.LineTo(10, 20) },
[]byte{
0x1f,
0x40, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x34, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"SetLineWidth",
func(ctx *Context) { ctx.SetLineWidth(2.5) },
[]byte{
0x20,
0x40, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"SetMiterLimit",
func(ctx *Context) { ctx.SetMiterLimit(5) },
[]byte{
0x22,
0x40, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"SetShadowBlur",
func(ctx *Context) { ctx.SetShadowBlur(15) },
[]byte{
0x2d,
0x40, 0x2e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"SetShadowColor",
func(ctx *Context) { ctx.SetShadowColor(color.RGBA{R: 10, G: 20, B: 30, A: 255}) },
[]byte{
0x2e,
0x0a, 0x14, 0x1e, 0xff,
},
},
{
"SetShadowColorString",
func(ctx *Context) { ctx.SetShadowColorString("#a0b3ff") },
[]byte{
0x3d,
0x00, 0x00, 0x00, 0x07, // len(color)
0x23, 0x61, 0x30, 0x62, 0x33, 0x66, 0x66, // color
},
},
{
"SetShadowOffsetX",
func(ctx *Context) { ctx.SetShadowOffsetX(32) },
[]byte{
0x2f,
0x40, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"SetShadowOffsetY",
func(ctx *Context) { ctx.SetShadowOffsetY(25) },
[]byte{
0x30,
0x40, 0x39, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"SetStrokeStyle",
func(ctx *Context) { ctx.SetStrokeStyle(color.RGBA{R: 120, G: 80, B: 110, A: 255}) },
[]byte{
0x33,
0x78, 0x50, 0x6e, 0xff,
},
},
{
"SetStrokeStyleString",
func(ctx *Context) { ctx.SetStrokeStyleString("LightGreen") },
[]byte{
0x3c,
0x00, 0x00, 0x00, 0x0a, // len(color)
0x4c, 0x69, 0x67, 0x68, 0x74, 0x47, 0x72, 0x65, 0x65, 0x6e, // color
},
},
{
"SetStrokeStyleGradient",
func(ctx *Context) { ctx.SetStrokeStyleGradient(&Gradient{id: 333333}) },
[]byte{
0x1a,
0x00, 0x05, 0x16, 0x15,
},
},
{
"SetStrokeStylePattern",
func(ctx *Context) { ctx.SetStrokeStylePattern(&Pattern{id: 54321}) },
[]byte{
0x43,
0x00, 0x00, 0xd4, 0x31,
},
},
{
"SetTextAlign",
func(ctx *Context) {
ctx.SetTextAlign(AlignStart)
ctx.SetTextAlign(AlignEnd)
ctx.SetTextAlign(AlignLeft)
ctx.SetTextAlign(AlignRight)
ctx.SetTextAlign(AlignCenter)
},
[]byte{
0x35, 0x00,
0x35, 0x01,
0x35, 0x02,
0x35, 0x03,
0x35, 0x04,
},
},
{
"SetTextBaseline",
func(ctx *Context) {
ctx.SetTextBaseline(BaselineAlphabetic)
ctx.SetTextBaseline(BaselineIdeographic)
ctx.SetTextBaseline(BaselineTop)
ctx.SetTextBaseline(BaselineBottom)
ctx.SetTextBaseline(BaselineHanging)
ctx.SetTextBaseline(BaselineMiddle)
},
[]byte{
0x36, 0x00,
0x36, 0x01,
0x36, 0x02,
0x36, 0x03,
0x36, 0x04,
0x36, 0x05,
},
},
{
"MoveTo",
func(ctx *Context) { ctx.MoveTo(300, 200) },
[]byte{
0x23,
0x40, 0x72, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x69, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"QuadraticCurveTo",
func(ctx *Context) { ctx.QuadraticCurveTo(130, 215, 155, 330) },
[]byte{
0x25,
0x40, 0x60, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x6a, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x63, 0x60, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x74, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"Rect",
func(ctx *Context) { ctx.Rect(52.5, 82.5, 70.2, 120.8) },
[]byte{
0x26,
0x40, 0x4a, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x54, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x51, 0x8c, 0xcc, 0xcc, 0xcc, 0xcc, 0xcd,
0x40, 0x5e, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33,
},
},
{
"Restore",
func(ctx *Context) { ctx.Restore() },
[]byte{0x27},
},
{
"Rotate",
func(ctx *Context) { ctx.Rotate(3.1415) },
[]byte{
0x28,
0x40, 0x09, 0x21, 0xca, 0xc0, 0x83, 0x12, 0x6f,
},
},
{
"Save",
func(ctx *Context) { ctx.Save() },
[]byte{0x29},
},
{
"Scale",
func(ctx *Context) { ctx.Scale(2.5, 3) },
[]byte{
0x2a,
0x40, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"Stroke",
func(ctx *Context) { ctx.Stroke() },
[]byte{0x31},
},
{
"StrokeText",
func(ctx *Context) { ctx.StrokeText("Test", 32, 42) },
[]byte{
0x34,
0x40, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // x
0x40, 0x45, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // y
0x00, 0x00, 0x00, 0x04, // len(text)
0x54, 0x65, 0x73, 0x74, // text
},
},
{
"StrokeTextMaxWidth",
func(ctx *Context) { ctx.StrokeTextMaxWidth("Test", 32, 42, 80) },
[]byte{
0x3a,
0x40, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // x
0x40, 0x45, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // y
0x40, 0x54, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // maxWidth
0x00, 0x00, 0x00, 0x04, // len(text)
0x54, 0x65, 0x73, 0x74, // text
},
},
{
"StrokeRect",
func(ctx *Context) { ctx.StrokeRect(93, 105, 60, 50) },
[]byte{
0x32,
0x40, 0x57, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x5a, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x4e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x49, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"Translate",
func(ctx *Context) { ctx.Translate(14.5, 23.9) },
[]byte{
0x38,
0x40, 0x2d, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x37, 0xe6, 0x66, 0x66, 0x66, 0x66, 0x66,
},
},
{
"Transform",
func(ctx *Context) { ctx.Transform(0.5, 3.2, 1.7, 5.2, 11, 21) },
[]byte{
0x37,
0x3f, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x09, 0x99, 0x99, 0x99, 0x99, 0x99, 0x9a,
0x3f, 0xfb, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33,
0x40, 0x14, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcd,
0x40, 0x26, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x35, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"SetTransform",
func(ctx *Context) { ctx.SetTransform(0.5, 3.2, 1.7, 5.2, 11, 21) },
[]byte{
0x2c,
0x3f, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x09, 0x99, 0x99, 0x99, 0x99, 0x99, 0x9a,
0x3f, 0xfb, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33,
0x40, 0x14, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcd,
0x40, 0x26, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x35, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"SetLineDash",
func(ctx *Context) {
ctx.SetLineDash([]float64{
0.5, 1.5, 0.25, 2,
})
},
[]byte{
0x2b,
0x00, 0x00, 0x00, 0x04, // len(segments)
0x3f, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x3f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x3f, 0xd0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"PutImageData",
func(ctx *Context) {
img := &ImageData{id: 255, ctx: ctx}
ctx.PutImageData(img, 30, 45)
},
[]byte{
0x24, // PutImageData
0x00, 0x00, 0x00, 0xff, // ID
0x40, 0x3e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // dx
0x40, 0x46, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, // dy
},
},
{
"PutImageDataDirty",
func(ctx *Context) {
img := &ImageData{id: 256, ctx: ctx}
ctx.PutImageDataDirty(img, 320, 200, 110, 85, 50, 40)
},
[]byte{
0x3e, // PutImageDataDirty
0x00, 0x00, 0x01, 0x00, // ID
0x40, 0x74, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // dx
0x40, 0x69, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // dy
0x40, 0x5b, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, // dirtyX
0x40, 0x55, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, // dirtyY
0x40, 0x49, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // dirtyWidth
0x40, 0x44, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // dirtyHeight
},
},
{
"DrawImage",
func(ctx *Context) {
img := &ImageData{id: 3, ctx: ctx}
ctx.DrawImage(img, 80, 90)
},
[]byte{
0x0d, // DrawImage
0x00, 0x00, 0x00, 0x03, // ID
0x40, 0x54, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // dx
0x40, 0x56, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, // dy
},
},
{
"DrawImageScaled",
func(ctx *Context) {
img := &ImageData{id: 1000000, ctx: ctx}
ctx.DrawImageScaled(img, 400, 500, 2.5, 3.2)
},
[]byte{
0x3f, // DrawImageScaled
0x00, 0x0f, 0x42, 0x40, // ID
0x40, 0x79, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // dx
0x40, 0x7f, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, // dy
0x40, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // dWidth
0x40, 0x09, 0x99, 0x99, 0x99, 0x99, 0x99, 0x9a, // dHeight
},
},
{
"DrawImageSubRectangle",
func(ctx *Context) {
img := &ImageData{id: 65535, ctx: ctx}
ctx.DrawImageSubRectangle(img, 42, 32, 30, 24, 10, 15, 40, 34)
},
[]byte{
0x40, // DrawImageSubRectangle
0x00, 0x00, 0xff, 0xff, // ID
0x40, 0x45, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // sx
0x40, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // sy
0x40, 0x3e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // sWidth
0x40, 0x38, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // sHeight
0x40, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // dx
0x40, 0x2e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // dy
0x40, 0x44, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // dWidth
0x40, 0x41, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // dHeight
},
},
{
"ImageData.Release",
func(ctx *Context) {
img := &ImageData{id: 999, ctx: ctx}
img.Release()
},
[]byte{
0x41, // ReleaseImage
0x00, 0x00, 0x03, 0xe7, // ID
},
},
{
"ImageData.Release idempotency",
func(ctx *Context) {
img := &ImageData{id: 2, ctx: ctx}
img.Release()
img.Release()
},
[]byte{
0x41, // ReleaseImage
0x00, 0x00, 0x00, 0x02, // ID
},
},
{
"CreateLinearGradient",
func(ctx *Context) {
ctx.CreateLinearGradient(70, 80, 100, 120)
},
[]byte{
0x09, // CreateLinearGradient
0x00, 0x00, 0x00, 0x00, // ID
0x40, 0x51, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, // x0
0x40, 0x54, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // y0
0x40, 0x59, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // x1
0x40, 0x5e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // y1
},
},
{
"CreateLinearGradient: ID generation",
func(ctx *Context) {
ctx.CreateLinearGradient(0, 0, 0, 0)
ctx.CreateLinearGradient(0, 0, 0, 0)
ctx.CreateLinearGradient(0, 0, 0, 0)
},
[]byte{
0x09, // CreateLinearGradient
0x00, 0x00, 0x00, 0x00, // ID = 0
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // x0
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // y0
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // x1
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // y1
0x09, // CreateLinearGradient
0x00, 0x00, 0x00, 0x01, // ID = 1
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // x0
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // y0
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // x1
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // y1
0x09, // CreateLinearGradient
0x00, 0x00, 0x00, 0x02, // ID = 2
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // x0
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // y0
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // x1
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // y1
},
},
{
"CreateRadialGradient",
func(ctx *Context) {
ctx.CreateRadialGradient(70, 80, 30, 100, 120, 20)
},
[]byte{
0x0b, // CreateRadialGradient
0x00, 0x00, 0x00, 0x00, // ID
0x40, 0x51, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, // x0
0x40, 0x54, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // y0
0x40, 0x3e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // r0
0x40, 0x59, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // x1
0x40, 0x5e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // y1
0x40, 0x34, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // r1
},
},
{
"Gradient.AddColorStop",
func(ctx *Context) {
g := &Gradient{id: 100000, ctx: ctx}
g.AddColorStop(4.6, color.RGBA{R: 25, G: 110, B: 48, A: 255})
},
[]byte{
0x14, // GradientAddColorStop
0x00, 0x01, 0x86, 0xa0, // ID
0x40, 0x12, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // offset
0x19, 0x6e, 0x30, 0xff, // R, G, B, A
},
},
{
"Gradient.AddColorStopString",
func(ctx *Context) {
g := &Gradient{id: 12345, ctx: ctx}
g.AddColorStopString(23.4, "yellow")
},
[]byte{
0x15, // GradientAddColorStopString
0x00, 0x00, 0x30, 0x39, // ID
0x40, 0x37, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
0x00, 0x00, 0x00, 0x06, // len(color)
0x79, 0x65, 0x6c, 0x6c, 0x6f, 0x77, // color
},
},
{
"Gradient.Release",
func(ctx *Context) {
g := &Gradient{id: 132, ctx: ctx}
g.Release()
},
[]byte{
0x21, // ReleaseGradient
0x00, 0x00, 0x00, 0x84, // ID
},
},
{
"Gradient.Release idempotency",
func(ctx *Context) {
g := &Gradient{id: 4, ctx: ctx}
g.Release()
g.Release()
},
[]byte{
0x21, // ReleaseGradient
0x00, 0x00, 0x00, 0x04, // ID
},
},
{
"CreatePattern",
func(ctx *Context) {
img := &ImageData{id: 16}
ctx.CreatePattern(img, PatternRepeatX)
ctx.CreatePattern(img, PatternRepeatY)
ctx.CreatePattern(img, PatternNoRepeat)
},
[]byte{
0x0a, // CreatePattern
0x00, 0x00, 0x00, 0x00, // ID
0x00, 0x00, 0x00, 0x10, // ImageData ID
0x01,
0x0a, // CreatePattern
0x00, 0x00, 0x00, 0x01, // ID
0x00, 0x00, 0x00, 0x10, // ImageData ID
0x02,
0x0a, // CreatePattern
0x00, 0x00, 0x00, 0x02, // ID
0x00, 0x00, 0x00, 0x10, // ImageData ID
0x03,
},
},
{
"Pattern.Release",
func(ctx *Context) {
p := &Pattern{id: 1023, ctx: ctx}
p.Release()
},
[]byte{
0x1b, // ReleasePattern
0x00, 0x00, 0x03, 0xff, // ID
},
},
{
"Pattern.Release idempotency",
func(ctx *Context) {
p := &Pattern{id: 10, ctx: ctx}
p.Release()
p.Release()
},
[]byte{
0x1b, // ReleasePattern
0x00, 0x00, 0x00, 0x0a, // ID
},
},
{
"GetImageData",
func(ctx *Context) {
ctx.GetImageData(10, 10, 320, 200)
},
[]byte{
0x44, // GetImageData
0x00, 0x00, 0x00, 0x00, // ID
0x40, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // sx
0x40, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // sy
0x40, 0x74, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // sw
0x40, 0x69, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // sh
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
draws := make(chan []byte)
ctx := newContext(draws, nil, nil)
go func(draw func(*Context)) {
draw(ctx)
ctx.Flush()
}(tt.draw)
got := <-draws
if diff := cmp.Diff(tt.want, got); diff != "" {
t.Errorf("mismatch (-want, +got)\n%s", diff)
}
})
}
}
func TestImageDataSize(t *testing.T) {
tests := []struct {
width int
height int
}{
{12, 32},
{320, 200},
{1350, 875},
}
ctx := newContext(nil, nil, nil)
for _, tt := range tests {
got := ctx.CreateImageData(image.NewRGBA(image.Rect(0, 0, tt.width, tt.height)))
if got.Width() != tt.width || got.Height() != tt.height {
t.Errorf("got: W %d H %d, want: W %d H %d",
got.Width(), got.Height(),
tt.width, tt.height)
}
}
}
func TestCanvasSize(t *testing.T) {
tests := []struct {
width, height int
}{
{width: 0, height: 0},
{width: 12, height: 36},
{width: 840, height: 900},
{width: 42314, height: 42355},
}
for _, tt := range tests {
ctx := newContext(nil, nil, &Options{
Width: tt.width,
Height: tt.height,
})
gotWidth := ctx.CanvasWidth()
gotHeight := ctx.CanvasHeight()
if gotWidth != tt.width || gotHeight != tt.height {
t.Errorf("got: W %d H %d, want: W %d H %d",
gotWidth, gotHeight, tt.width, tt.height)
}
}
}
func TestUseAfterRelease(t *testing.T) {
tests := []struct {
name string
typeName string
draw func(ctx *Context)
}{
{
name: "ImageData",
typeName: "ImageData",
draw: func(ctx *Context) {
img := ctx.CreateImageData(image.NewRGBA(image.Rect(0, 0, 0, 0)))
img.Release()
ctx.DrawImage(img, 0, 0)
},
},
{
name: "Gradient",
typeName: "Gradient",
draw: func(ctx *Context) {
g := ctx.CreateLinearGradient(0, 0, 0, 0)
g.Release()
g.AddColorStop(0, color.Black)
},
},
{
name: "Pattern",
typeName: "Pattern",
draw: func(ctx *Context) {
img := ctx.CreateImageData(image.NewRGBA(image.Rect(0, 0, 0, 0)))
p := ctx.CreatePattern(img, PatternRepeat)
p.Release()
ctx.SetFillStylePattern(p)
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
defer func() {
r := recover()
if r == nil {
t.Errorf("expected panic, but did not panic")
return
}
want := tt.typeName + ": use after release"
if r != want {
t.Errorf("expected panic message %q, but was: %q", want, r)
}
}()
ctx := newContext(nil, nil, nil)
tt.draw(ctx)
})
}