openOutpaint/js/ui/tool/dream.js

const dream_generate_callback = (evn, state) => {
	if (evn.target.id === "overlayCanvas" && !blockNewImages) {
		const bb = getBoundingBox(
			evn.x,
			evn.y,
			basePixelCount * scaleFactor,
			basePixelCount * scaleFactor,
			state.snapToGrid && basePixelCount
		);

		// Build request to the API
		const request = {};
		Object.assign(request, stableDiffusionData);

		// Load prompt (maybe we should add some events so we don't have to do this)
		request.prompt = document.getElementById("prompt").value;
		request.negative_prompt = document.getElementById("negPrompt").value;

		// Don't allow another image until is finished
		blockNewImages = true;

		// Setup marching ants
		stopMarching = march(bb);

		// Setup some basic information for SD
		request.width = bb.w;
		request.height = bb.h;

		request.firstphase_width = bb.w / 2;
		request.firstphase_height = bb.h / 2;

		// Use txt2img if canvas is blank
		if (isCanvasBlank(bb.x, bb.y, bb.w, bb.h, imgCanvas)) {
			// Dream
			dream(bb.x, bb.y, request, {method: "txt2img", stopMarching, bb});
		} else {
			// Use img2img if not

			// Temporary canvas for init image and mask generation
			const auxCanvas = document.createElement("canvas");
			auxCanvas.width = request.width;
			auxCanvas.height = request.height;
			const auxCtx = auxCanvas.getContext("2d");

			auxCtx.fillStyle = "#000F";

			// Get init image
			auxCtx.fillRect(0, 0, bb.w, bb.h);
			auxCtx.drawImage(imgCanvas, bb.x, bb.y, bb.w, bb.h, 0, 0, bb.w, bb.h);
			request.init_images = [auxCanvas.toDataURL()];

			// Get mask image
			auxCtx.fillRect(0, 0, bb.w, bb.h);
			auxCtx.globalCompositeOperation = "destination-in";
			auxCtx.drawImage(imgCanvas, bb.x, bb.y, bb.w, bb.h, 0, 0, bb.w, bb.h);
			auxCtx.globalCompositeOperation = "destination-out";
			auxCtx.drawImage(
				maskPaintCanvas,
				bb.x,
				bb.y,
				bb.w,
				bb.h,
				0,
				0,
				bb.w,
				bb.h
			);
			auxCtx.globalCompositeOperation = "destination-atop";
			auxCtx.fillStyle = "#FFFF";
			auxCtx.fillRect(0, 0, bb.w, bb.h);
			var currentMask = auxCanvas.toDataURL();
			request.mask =
				state.overMaskPx > 0
					? applyOvermask(auxCanvas, auxCtx, state.overMaskPx, currentMask)
					: currentMask;
			// Dream
			dream(bb.x, bb.y, request, {method: "img2img", stopMarching, bb});
		}
	}
};
const dream_erase_callback = (evn, state) => {
	const bb = getBoundingBox(
		evn.x,
		evn.y,
		basePixelCount * scaleFactor,
		basePixelCount * scaleFactor,
		state.snapToGrid && basePixelCount
	);
	commands.runCommand("eraseImage", "Erase Area", bb);
};

function applyOvermask(canvas, ctx, px) {
	// :badpokerface: look it might be all placebo but i like overmask lol
	// yes it's crushingly inefficient i knooow :( must fix
	// https://stackoverflow.com/a/30204783 was instrumental to this working or completely to blame for this disaster depending on your interpretation
	const tmpOvermaskCanvas = document.createElement("canvas");
	tmpOvermaskCanvas.width = canvas.width;
	tmpOvermaskCanvas.height = canvas.height;
	var ctxImgData = ctx.getImageData(0, 0, canvas.width, canvas.height);
	const omCtx = tmpOvermaskCanvas.getContext("2d");
	omCtx.putImageData(ctxImgData, 0, 0);
	for (i = 0; i < ctxImgData.data.length; i += 4) {
		if (ctxImgData.data[i] == 255) {
			// white pixel?
			// just blotch all over the thing
			var rando = Math.floor(Math.random() * px);
			omCtx.beginPath();
			omCtx.arc(
				(i / 4) % tmpOvermaskCanvas.width,
				Math.floor(i / 4 / tmpOvermaskCanvas.width),
				scaleFactor + rando, // was 4 * sf + rando, too big
				0,
				2 * Math.PI,
				true
			);
			omCtx.fillStyle = "#FFFFFFFF";
			omCtx.fill();
		}
	}
	return tmpOvermaskCanvas.toDataURL();
}

/**
 * Image to Image
 */
const dream_img2img_callback = (evn, state) => {
	if (evn.target.id === "overlayCanvas" && !blockNewImages) {
		const bb = getBoundingBox(
			evn.x,
			evn.y,
			basePixelCount * scaleFactor,
			basePixelCount * scaleFactor,
			state.snapToGrid && basePixelCount
		);

		// Do nothing if no image exists
		if (isCanvasBlank(bb.x, bb.y, bb.w, bb.h, imgCanvas)) return;

		// Build request to the API
		const request = {};
		Object.assign(request, stableDiffusionData);

		request.denoising_strength = state.denoisingStrength;
		request.inpainting_fill = 1; // For img2img use original

		// Load prompt (maybe we should add some events so we don't have to do this)
		request.prompt = document.getElementById("prompt").value;
		request.negative_prompt = document.getElementById("negPrompt").value;

		// Don't allow another image until is finished
		blockNewImages = true;

		// Setup marching ants
		stopMarching = march(bb);

		// Setup some basic information for SD
		request.width = bb.w;
		request.height = bb.h;

		request.firstphase_width = bb.w / 2;
		request.firstphase_height = bb.h / 2;

		// Use img2img

		// Temporary canvas for init image and mask generation
		const auxCanvas = document.createElement("canvas");
		auxCanvas.width = request.width;
		auxCanvas.height = request.height;
		const auxCtx = auxCanvas.getContext("2d");

		auxCtx.fillStyle = "#000F";

		// Get init image
		auxCtx.fillRect(0, 0, bb.w, bb.h);
		auxCtx.drawImage(imgCanvas, bb.x, bb.y, bb.w, bb.h, 0, 0, bb.w, bb.h);
		request.init_images = [auxCanvas.toDataURL()];

		// Get mask image
		auxCtx.fillRect(0, 0, bb.w, bb.h);
		auxCtx.globalCompositeOperation = "destination-out";
		auxCtx.drawImage(maskPaintCanvas, bb.x, bb.y, bb.w, bb.h, 0, 0, bb.w, bb.h);

		// Border Mask
		if (state.useBorderMask) {
			auxCtx.fillStyle = "#000F";
			auxCtx.fillRect(0, 0, state.borderMaskSize, bb.h);
			auxCtx.fillRect(0, 0, bb.w, state.borderMaskSize);
			auxCtx.fillRect(
				bb.w - state.borderMaskSize,
				0,
				state.borderMaskSize,
				bb.h
			);
			auxCtx.fillRect(
				0,
				bb.h - state.borderMaskSize,
				bb.w,
				state.borderMaskSize
			);
		}

		auxCtx.globalCompositeOperation = "destination-atop";
		auxCtx.fillStyle = "#FFFF";
		auxCtx.fillRect(0, 0, bb.w, bb.h);
		request.mask = auxCanvas.toDataURL();

		request.inpainting_mask_invert = true;

		// Dream
		dream(bb.x, bb.y, request, {method: "img2img", stopMarching, bb});
	}
};