mirror of
https://github.com/Azornes/Comfyui-LayerForge.git
synced 2026-03-21 20:52:12 -03:00
1bb4909438
Removed delegating methods to CanvasState from Canvas.js and updated all references to use canvas.canvasState directly for state operations (undo, redo, saveStateToDB). Updated CanvasInteractions.js, CanvasIO.js, CanvasLayers.js, and CanvasView.js accordingly. Updated REFACTORING_GUIDE.md to reflect the completion of this refactor.
674 lines
23 KiB
JavaScript
674 lines
23 KiB
JavaScript
import {saveImage, removeImage} from "./db.js";
|
|
import {createModuleLogger} from "./utils/LoggerUtils.js";
|
|
import {generateUUID, generateUniqueFileName} from "./utils/CommonUtils.js";
|
|
import {withErrorHandling, createValidationError} from "./ErrorHandler.js";
|
|
|
|
const log = createModuleLogger('CanvasLayers');
|
|
|
|
export class CanvasLayers {
|
|
constructor(canvas) {
|
|
this.canvas = canvas;
|
|
this.blendModes = [
|
|
{name: 'normal', label: 'Normal'},
|
|
{name: 'multiply', label: 'Multiply'},
|
|
{name: 'screen', label: 'Screen'},
|
|
{name: 'overlay', label: 'Overlay'},
|
|
{name: 'darken', label: 'Darken'},
|
|
{name: 'lighten', label: 'Lighten'},
|
|
{name: 'color-dodge', label: 'Color Dodge'},
|
|
{name: 'color-burn', label: 'Color Burn'},
|
|
{name: 'hard-light', label: 'Hard Light'},
|
|
{name: 'soft-light', label: 'Soft Light'},
|
|
{name: 'difference', label: 'Difference'},
|
|
{name: 'exclusion', label: 'Exclusion'}
|
|
];
|
|
this.selectedBlendMode = null;
|
|
this.blendOpacity = 100;
|
|
this.isAdjustingOpacity = false;
|
|
this.internalClipboard = [];
|
|
}
|
|
|
|
async copySelectedLayers() {
|
|
if (this.canvas.selectedLayers.length === 0) return;
|
|
this.internalClipboard = this.canvas.selectedLayers.map(layer => ({...layer}));
|
|
log.info(`Copied ${this.internalClipboard.length} layer(s) to internal clipboard.`);
|
|
try {
|
|
const blob = await this.getFlattenedSelectionAsBlob();
|
|
if (blob) {
|
|
const item = new ClipboardItem({'image/png': blob});
|
|
await navigator.clipboard.write([item]);
|
|
log.info("Flattened selection copied to the system clipboard.");
|
|
}
|
|
} catch (error) {
|
|
log.error("Failed to copy image to system clipboard:", error);
|
|
}
|
|
}
|
|
|
|
pasteLayers() {
|
|
if (this.internalClipboard.length === 0) return;
|
|
this.canvas.saveState();
|
|
const newLayers = [];
|
|
const pasteOffset = 20;
|
|
|
|
this.internalClipboard.forEach(clipboardLayer => {
|
|
const newLayer = {
|
|
...clipboardLayer,
|
|
x: clipboardLayer.x + pasteOffset / this.canvas.viewport.zoom,
|
|
y: clipboardLayer.y + pasteOffset / this.canvas.viewport.zoom,
|
|
zIndex: this.canvas.layers.length
|
|
};
|
|
this.canvas.layers.push(newLayer);
|
|
newLayers.push(newLayer);
|
|
});
|
|
|
|
this.canvas.updateSelection(newLayers);
|
|
this.canvas.render();
|
|
log.info(`Pasted ${newLayers.length} layer(s).`);
|
|
}
|
|
|
|
async handlePaste(addMode = 'mouse') {
|
|
try {
|
|
if (!navigator.clipboard?.read) {
|
|
log.info("Browser does not support clipboard read API. Falling back to internal paste.");
|
|
this.pasteLayers();
|
|
return;
|
|
}
|
|
|
|
const clipboardItems = await navigator.clipboard.read();
|
|
let imagePasted = false;
|
|
|
|
for (const item of clipboardItems) {
|
|
const imageType = item.types.find(type => type.startsWith('image/'));
|
|
|
|
if (imageType) {
|
|
const blob = await item.getType(imageType);
|
|
const reader = new FileReader();
|
|
reader.onload = (event) => {
|
|
const img = new Image();
|
|
img.onload = async () => {
|
|
await this.addLayerWithImage(img, {}, addMode);
|
|
};
|
|
img.src = event.target.result;
|
|
};
|
|
reader.readAsDataURL(blob);
|
|
imagePasted = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!imagePasted) {
|
|
this.pasteLayers();
|
|
}
|
|
|
|
} catch (err) {
|
|
log.error("Paste operation failed, falling back to internal paste. Error:", err);
|
|
this.pasteLayers();
|
|
}
|
|
}
|
|
|
|
addLayerWithImage = withErrorHandling(async (image, layerProps = {}, addMode = 'default') => {
|
|
if (!image) {
|
|
throw createValidationError("Image is required for layer creation");
|
|
}
|
|
|
|
log.debug("Adding layer with image:", image, "with mode:", addMode);
|
|
const imageId = generateUUID();
|
|
await saveImage(imageId, image.src);
|
|
this.canvas.imageCache.set(imageId, image.src);
|
|
|
|
let finalWidth = image.width;
|
|
let finalHeight = image.height;
|
|
let finalX, finalY;
|
|
|
|
if (addMode === 'fit') {
|
|
const scale = Math.min(this.canvas.width / image.width, this.canvas.height / image.height);
|
|
finalWidth = image.width * scale;
|
|
finalHeight = image.height * scale;
|
|
finalX = (this.canvas.width - finalWidth) / 2;
|
|
finalY = (this.canvas.height - finalHeight) / 2;
|
|
} else if (addMode === 'mouse') {
|
|
finalX = this.canvas.lastMousePosition.x - finalWidth / 2;
|
|
finalY = this.canvas.lastMousePosition.y - finalHeight / 2;
|
|
} else { // 'center' or 'default'
|
|
finalX = (this.canvas.width - finalWidth) / 2;
|
|
finalY = (this.canvas.height - finalHeight) / 2;
|
|
}
|
|
|
|
const layer = {
|
|
image: image,
|
|
imageId: imageId,
|
|
x: finalX,
|
|
y: finalY,
|
|
width: finalWidth,
|
|
height: finalHeight,
|
|
originalWidth: image.width,
|
|
originalHeight: image.height,
|
|
rotation: 0,
|
|
zIndex: this.canvas.layers.length,
|
|
blendMode: 'normal',
|
|
opacity: 1,
|
|
...layerProps
|
|
};
|
|
|
|
this.canvas.layers.push(layer);
|
|
this.canvas.updateSelection([layer]);
|
|
this.canvas.render();
|
|
this.canvas.saveState();
|
|
|
|
log.info("Layer added successfully");
|
|
return layer;
|
|
}, 'CanvasLayers.addLayerWithImage');
|
|
|
|
async addLayer(image) {
|
|
return this.addLayerWithImage(image);
|
|
}
|
|
|
|
moveLayerUp() {
|
|
if (this.canvas.selectedLayers.length === 0) return;
|
|
const selectedIndicesSet = new Set(this.canvas.selectedLayers.map(layer => this.canvas.layers.indexOf(layer)));
|
|
|
|
const sortedIndices = Array.from(selectedIndicesSet).sort((a, b) => b - a);
|
|
|
|
sortedIndices.forEach(index => {
|
|
const targetIndex = index + 1;
|
|
|
|
if (targetIndex < this.canvas.layers.length && !selectedIndicesSet.has(targetIndex)) {
|
|
[this.canvas.layers[index], this.canvas.layers[targetIndex]] = [this.canvas.layers[targetIndex], this.canvas.layers[index]];
|
|
}
|
|
});
|
|
this.canvas.layers.forEach((layer, i) => layer.zIndex = i);
|
|
this.canvas.render();
|
|
this.canvas.saveState();
|
|
}
|
|
|
|
moveLayerDown() {
|
|
if (this.canvas.selectedLayers.length === 0) return;
|
|
const selectedIndicesSet = new Set(this.canvas.selectedLayers.map(layer => this.canvas.layers.indexOf(layer)));
|
|
|
|
const sortedIndices = Array.from(selectedIndicesSet).sort((a, b) => a - b);
|
|
|
|
sortedIndices.forEach(index => {
|
|
const targetIndex = index - 1;
|
|
|
|
if (targetIndex >= 0 && !selectedIndicesSet.has(targetIndex)) {
|
|
[this.canvas.layers[index], this.canvas.layers[targetIndex]] = [this.canvas.layers[targetIndex], this.canvas.layers[index]];
|
|
}
|
|
});
|
|
this.canvas.layers.forEach((layer, i) => layer.zIndex = i);
|
|
this.canvas.render();
|
|
this.canvas.saveState();
|
|
}
|
|
|
|
/**
|
|
* Zmienia rozmiar wybranych warstw
|
|
* @param {number} scale - Skala zmiany rozmiaru
|
|
*/
|
|
resizeLayer(scale) {
|
|
if (this.canvas.selectedLayers.length === 0) return;
|
|
|
|
this.canvas.selectedLayers.forEach(layer => {
|
|
layer.width *= scale;
|
|
layer.height *= scale;
|
|
});
|
|
this.canvas.render();
|
|
this.canvas.saveState();
|
|
}
|
|
|
|
/**
|
|
* Obraca wybrane warstwy
|
|
* @param {number} angle - Kąt obrotu w stopniach
|
|
*/
|
|
rotateLayer(angle) {
|
|
if (this.canvas.selectedLayers.length === 0) return;
|
|
|
|
this.canvas.selectedLayers.forEach(layer => {
|
|
layer.rotation += angle;
|
|
});
|
|
this.canvas.render();
|
|
this.canvas.saveState();
|
|
}
|
|
|
|
getLayerAtPosition(worldX, worldY) {
|
|
for (let i = this.canvas.layers.length - 1; i >= 0; i--) {
|
|
const layer = this.canvas.layers[i];
|
|
|
|
const centerX = layer.x + layer.width / 2;
|
|
const centerY = layer.y + layer.height / 2;
|
|
|
|
const dx = worldX - centerX;
|
|
const dy = worldY - centerY;
|
|
|
|
const rad = -layer.rotation * Math.PI / 180;
|
|
const rotatedX = dx * Math.cos(rad) - dy * Math.sin(rad);
|
|
const rotatedY = dx * Math.sin(rad) + dy * Math.cos(rad);
|
|
|
|
if (Math.abs(rotatedX) <= layer.width / 2 && Math.abs(rotatedY) <= layer.height / 2) {
|
|
const localX = rotatedX + layer.width / 2;
|
|
const localY = rotatedY + layer.height / 2;
|
|
|
|
return {
|
|
layer: layer,
|
|
localX: localX,
|
|
localY: localY
|
|
};
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
async mirrorHorizontal() {
|
|
if (this.canvas.selectedLayers.length === 0) return;
|
|
|
|
const promises = this.canvas.selectedLayers.map(layer => {
|
|
return new Promise(resolve => {
|
|
const tempCanvas = document.createElement('canvas');
|
|
const tempCtx = tempCanvas.getContext('2d');
|
|
tempCanvas.width = layer.image.width;
|
|
tempCanvas.height = layer.image.height;
|
|
|
|
tempCtx.translate(tempCanvas.width, 0);
|
|
tempCtx.scale(-1, 1);
|
|
tempCtx.drawImage(layer.image, 0, 0);
|
|
|
|
const newImage = new Image();
|
|
newImage.onload = () => {
|
|
layer.image = newImage;
|
|
resolve();
|
|
};
|
|
newImage.src = tempCanvas.toDataURL();
|
|
});
|
|
});
|
|
|
|
await Promise.all(promises);
|
|
this.canvas.render();
|
|
this.canvas.saveState();
|
|
}
|
|
|
|
async mirrorVertical() {
|
|
if (this.canvas.selectedLayers.length === 0) return;
|
|
|
|
const promises = this.canvas.selectedLayers.map(layer => {
|
|
return new Promise(resolve => {
|
|
const tempCanvas = document.createElement('canvas');
|
|
const tempCtx = tempCanvas.getContext('2d');
|
|
tempCanvas.width = layer.image.width;
|
|
tempCanvas.height = layer.image.height;
|
|
|
|
tempCtx.translate(0, tempCanvas.height);
|
|
tempCtx.scale(1, -1);
|
|
tempCtx.drawImage(layer.image, 0, 0);
|
|
|
|
const newImage = new Image();
|
|
newImage.onload = () => {
|
|
layer.image = newImage;
|
|
resolve();
|
|
};
|
|
newImage.src = tempCanvas.toDataURL();
|
|
});
|
|
});
|
|
|
|
await Promise.all(promises);
|
|
this.canvas.render();
|
|
this.canvas.saveState();
|
|
}
|
|
|
|
async getLayerImageData(layer) {
|
|
try {
|
|
const tempCanvas = document.createElement('canvas');
|
|
const tempCtx = tempCanvas.getContext('2d');
|
|
|
|
tempCanvas.width = layer.width;
|
|
tempCanvas.height = layer.height;
|
|
|
|
tempCtx.clearRect(0, 0, tempCanvas.width, tempCanvas.height);
|
|
|
|
tempCtx.save();
|
|
tempCtx.translate(layer.width / 2, layer.height / 2);
|
|
tempCtx.rotate(layer.rotation * Math.PI / 180);
|
|
tempCtx.drawImage(
|
|
layer.image,
|
|
-layer.width / 2,
|
|
-layer.height / 2,
|
|
layer.width,
|
|
layer.height
|
|
);
|
|
tempCtx.restore();
|
|
|
|
const dataUrl = tempCanvas.toDataURL('image/png');
|
|
if (!dataUrl.startsWith('data:image/png;base64,')) {
|
|
throw new Error("Invalid image data format");
|
|
}
|
|
|
|
return dataUrl;
|
|
} catch (error) {
|
|
log.error("Error getting layer image data:", error);
|
|
throw error;
|
|
}
|
|
}
|
|
|
|
updateOutputAreaSize(width, height, saveHistory = true) {
|
|
if (saveHistory) {
|
|
this.canvas.saveState();
|
|
}
|
|
this.canvas.width = width;
|
|
this.canvas.height = height;
|
|
this.canvas.maskTool.resize(width, height);
|
|
|
|
this.canvas.canvas.width = width;
|
|
this.canvas.canvas.height = height;
|
|
|
|
this.canvas.render();
|
|
|
|
if (saveHistory) {
|
|
this.canvas.canvasState.saveStateToDB();
|
|
}
|
|
}
|
|
|
|
getHandles(layer) {
|
|
if (!layer) return {};
|
|
|
|
const centerX = layer.x + layer.width / 2;
|
|
const centerY = layer.y + layer.height / 2;
|
|
const rad = layer.rotation * Math.PI / 180;
|
|
const cos = Math.cos(rad);
|
|
const sin = Math.sin(rad);
|
|
|
|
const halfW = layer.width / 2;
|
|
const halfH = layer.height / 2;
|
|
const localHandles = {
|
|
'n': {x: 0, y: -halfH},
|
|
'ne': {x: halfW, y: -halfH},
|
|
'e': {x: halfW, y: 0},
|
|
'se': {x: halfW, y: halfH},
|
|
's': {x: 0, y: halfH},
|
|
'sw': {x: -halfW, y: halfH},
|
|
'w': {x: -halfW, y: 0},
|
|
'nw': {x: -halfW, y: -halfH},
|
|
'rot': {x: 0, y: -halfH - 20 / this.canvas.viewport.zoom}
|
|
};
|
|
|
|
const worldHandles = {};
|
|
for (const key in localHandles) {
|
|
const p = localHandles[key];
|
|
worldHandles[key] = {
|
|
x: centerX + (p.x * cos - p.y * sin),
|
|
y: centerY + (p.x * sin + p.y * cos)
|
|
};
|
|
}
|
|
return worldHandles;
|
|
}
|
|
|
|
getHandleAtPosition(worldX, worldY) {
|
|
if (this.canvas.selectedLayers.length === 0) return null;
|
|
|
|
const handleRadius = 8 / this.canvas.viewport.zoom;
|
|
for (let i = this.canvas.selectedLayers.length - 1; i >= 0; i--) {
|
|
const layer = this.canvas.selectedLayers[i];
|
|
const handles = this.getHandles(layer);
|
|
|
|
for (const key in handles) {
|
|
const handlePos = handles[key];
|
|
const dx = worldX - handlePos.x;
|
|
const dy = worldY - handlePos.y;
|
|
if (dx * dx + dy * dy <= handleRadius * handleRadius) {
|
|
return {layer: layer, handle: key};
|
|
}
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
showBlendModeMenu(x, y) {
|
|
this.closeBlendModeMenu();
|
|
|
|
const menu = document.createElement('div');
|
|
menu.id = 'blend-mode-menu';
|
|
menu.style.cssText = `
|
|
position: fixed;
|
|
left: ${x}px;
|
|
top: ${y}px;
|
|
background: #2a2a2a;
|
|
border: 1px solid #3a3a3a;
|
|
border-radius: 4px;
|
|
padding: 5px;
|
|
z-index: 10000;
|
|
box-shadow: 0 2px 10px rgba(0,0,0,0.3);
|
|
`;
|
|
|
|
this.blendModes.forEach(mode => {
|
|
const container = document.createElement('div');
|
|
container.className = 'blend-mode-container';
|
|
container.style.cssText = `
|
|
margin-bottom: 5px;
|
|
`;
|
|
|
|
const option = document.createElement('div');
|
|
option.style.cssText = `
|
|
padding: 5px 10px;
|
|
color: white;
|
|
cursor: pointer;
|
|
transition: background-color 0.2s;
|
|
`;
|
|
option.textContent = `${mode.label} (${mode.name})`;
|
|
|
|
const slider = document.createElement('input');
|
|
slider.type = 'range';
|
|
slider.min = '0';
|
|
slider.max = '100';
|
|
|
|
slider.value = this.canvas.selectedLayer.opacity ? Math.round(this.canvas.selectedLayer.opacity * 100) : 100;
|
|
slider.style.cssText = `
|
|
width: 100%;
|
|
margin: 5px 0;
|
|
display: none;
|
|
`;
|
|
|
|
if (this.canvas.selectedLayer.blendMode === mode.name) {
|
|
slider.style.display = 'block';
|
|
option.style.backgroundColor = '#3a3a3a';
|
|
}
|
|
|
|
option.onclick = () => {
|
|
menu.querySelectorAll('input[type="range"]').forEach(s => {
|
|
s.style.display = 'none';
|
|
});
|
|
menu.querySelectorAll('.blend-mode-container div').forEach(d => {
|
|
d.style.backgroundColor = '';
|
|
});
|
|
|
|
slider.style.display = 'block';
|
|
option.style.backgroundColor = '#3a3a3a';
|
|
|
|
if (this.canvas.selectedLayer) {
|
|
this.canvas.selectedLayer.blendMode = mode.name;
|
|
this.canvas.render();
|
|
}
|
|
};
|
|
|
|
slider.addEventListener('input', () => {
|
|
if (this.canvas.selectedLayer) {
|
|
this.canvas.selectedLayer.opacity = slider.value / 100;
|
|
this.canvas.render();
|
|
}
|
|
});
|
|
|
|
slider.addEventListener('change', async () => {
|
|
if (this.canvas.selectedLayer) {
|
|
this.canvas.selectedLayer.opacity = slider.value / 100;
|
|
this.canvas.render();
|
|
const saveWithFallback = async (fileName) => {
|
|
try {
|
|
const uniqueFileName = generateUniqueFileName(fileName, this.canvas.node.id);
|
|
return await this.canvas.saveToServer(uniqueFileName);
|
|
} catch (error) {
|
|
console.warn(`Failed to save with unique name, falling back to original: ${fileName}`, error);
|
|
return await this.canvas.saveToServer(fileName);
|
|
}
|
|
};
|
|
|
|
await saveWithFallback(this.canvas.widget.value);
|
|
if (this.canvas.node) {
|
|
app.graph.runStep();
|
|
}
|
|
}
|
|
});
|
|
|
|
container.appendChild(option);
|
|
container.appendChild(slider);
|
|
menu.appendChild(container);
|
|
});
|
|
|
|
const container = this.canvas.canvas.parentElement || document.body;
|
|
container.appendChild(menu);
|
|
|
|
const closeMenu = (e) => {
|
|
if (!menu.contains(e.target)) {
|
|
this.closeBlendModeMenu();
|
|
document.removeEventListener('mousedown', closeMenu);
|
|
}
|
|
};
|
|
setTimeout(() => {
|
|
document.addEventListener('mousedown', closeMenu);
|
|
}, 0);
|
|
}
|
|
|
|
closeBlendModeMenu() {
|
|
const menu = document.getElementById('blend-mode-menu');
|
|
if (menu && menu.parentNode) {
|
|
menu.parentNode.removeChild(menu);
|
|
}
|
|
}
|
|
|
|
showOpacitySlider(mode) {
|
|
const slider = document.createElement('input');
|
|
slider.type = 'range';
|
|
slider.min = '0';
|
|
slider.max = '100';
|
|
slider.value = this.blendOpacity;
|
|
slider.className = 'blend-opacity-slider';
|
|
|
|
slider.addEventListener('input', (e) => {
|
|
this.blendOpacity = parseInt(e.target.value);
|
|
});
|
|
|
|
const modeElement = document.querySelector(`[data-blend-mode="${mode}"]`);
|
|
if (modeElement) {
|
|
modeElement.appendChild(slider);
|
|
}
|
|
}
|
|
|
|
async getFlattenedCanvasAsBlob() {
|
|
return new Promise((resolve, reject) => {
|
|
const tempCanvas = document.createElement('canvas');
|
|
tempCanvas.width = this.canvas.width;
|
|
tempCanvas.height = this.canvas.height;
|
|
const tempCtx = tempCanvas.getContext('2d');
|
|
|
|
const sortedLayers = [...this.canvas.layers].sort((a, b) => a.zIndex - b.zIndex);
|
|
|
|
sortedLayers.forEach(layer => {
|
|
if (!layer.image) return;
|
|
|
|
tempCtx.save();
|
|
tempCtx.globalCompositeOperation = layer.blendMode || 'normal';
|
|
tempCtx.globalAlpha = layer.opacity !== undefined ? layer.opacity : 1;
|
|
const centerX = layer.x + layer.width / 2;
|
|
const centerY = layer.y + layer.height / 2;
|
|
tempCtx.translate(centerX, centerY);
|
|
tempCtx.rotate(layer.rotation * Math.PI / 180);
|
|
tempCtx.drawImage(
|
|
layer.image,
|
|
-layer.width / 2,
|
|
-layer.height / 2,
|
|
layer.width,
|
|
layer.height
|
|
);
|
|
|
|
tempCtx.restore();
|
|
});
|
|
|
|
tempCanvas.toBlob((blob) => {
|
|
if (blob) {
|
|
resolve(blob);
|
|
} else {
|
|
reject(new Error('Canvas toBlob failed.'));
|
|
}
|
|
}, 'image/png');
|
|
});
|
|
}
|
|
|
|
async getFlattenedSelectionAsBlob() {
|
|
if (this.canvas.selectedLayers.length === 0) {
|
|
return null;
|
|
}
|
|
|
|
return new Promise((resolve) => {
|
|
let minX = Infinity, minY = Infinity, maxX = -Infinity, maxY = -Infinity;
|
|
this.canvas.selectedLayers.forEach(layer => {
|
|
const centerX = layer.x + layer.width / 2;
|
|
const centerY = layer.y + layer.height / 2;
|
|
const rad = layer.rotation * Math.PI / 180;
|
|
const cos = Math.cos(rad);
|
|
const sin = Math.sin(rad);
|
|
|
|
const halfW = layer.width / 2;
|
|
const halfH = layer.height / 2;
|
|
|
|
const corners = [
|
|
{x: -halfW, y: -halfH},
|
|
{x: halfW, y: -halfH},
|
|
{x: halfW, y: halfH},
|
|
{x: -halfW, y: halfH}
|
|
];
|
|
|
|
corners.forEach(p => {
|
|
const worldX = centerX + (p.x * cos - p.y * sin);
|
|
const worldY = centerY + (p.x * sin + p.y * cos);
|
|
|
|
minX = Math.min(minX, worldX);
|
|
minY = Math.min(minY, worldY);
|
|
maxX = Math.max(maxX, worldX);
|
|
maxY = Math.max(maxY, worldY);
|
|
});
|
|
});
|
|
|
|
const newWidth = Math.ceil(maxX - minX);
|
|
const newHeight = Math.ceil(maxY - minY);
|
|
|
|
if (newWidth <= 0 || newHeight <= 0) {
|
|
resolve(null);
|
|
return;
|
|
}
|
|
const tempCanvas = document.createElement('canvas');
|
|
tempCanvas.width = newWidth;
|
|
tempCanvas.height = newHeight;
|
|
const tempCtx = tempCanvas.getContext('2d');
|
|
|
|
tempCtx.translate(-minX, -minY);
|
|
|
|
const sortedSelection = [...this.canvas.selectedLayers].sort((a, b) => a.zIndex - b.zIndex);
|
|
|
|
sortedSelection.forEach(layer => {
|
|
if (!layer.image) return;
|
|
|
|
tempCtx.save();
|
|
tempCtx.globalCompositeOperation = layer.blendMode || 'normal';
|
|
tempCtx.globalAlpha = layer.opacity !== undefined ? layer.opacity : 1;
|
|
|
|
const centerX = layer.x + layer.width / 2;
|
|
const centerY = layer.y + layer.height / 2;
|
|
tempCtx.translate(centerX, centerY);
|
|
tempCtx.rotate(layer.rotation * Math.PI / 180);
|
|
tempCtx.drawImage(
|
|
layer.image,
|
|
-layer.width / 2, -layer.height / 2,
|
|
layer.width, layer.height
|
|
);
|
|
tempCtx.restore();
|
|
});
|
|
tempCanvas.toBlob((blob) => {
|
|
resolve(blob);
|
|
}, 'image/png');
|
|
});
|
|
}
|
|
}
|