Add size option to choose size with pixels

predict.py

@@ -62,14 +62,28 @@
     "9:21": (640, 1536),
 }
 
+# 1 megapixel sizes
+SIZES = {
+    f"{x}x{y}": (x, y) for x, y in ASPECT_RATIOS.values()
+}
+# 0.25 megapixel sizes
+SIZES.update({
+    f"{x / 2}x{y / 2}": (x / 2, y / 2) for x, y in ASPECT_RATIOS.values()
+})
+
 
 @dataclass
 class SharedInputs:
     prompt: Input = Input(description="Prompt for generated image")
+    size: Input = Input(
+        description="Size of the generated image",
+        choices=list(SIZES.keys()),
+        default="1024x1024",
+    )
     aspect_ratio: Input = Input(
         description="Aspect ratio for the generated image",
         choices=list(ASPECT_RATIOS.keys()),
-        default="1:1",
+        default=None,
     )
     num_outputs: Input = Input(
         description="Number of outputs to generate", default=1, le=4, ge=1
@@ -99,7 +113,7 @@ class SharedInputs:
     megapixels: Input = Input(
         description="Approximate number of megapixels for generated image",
         choices=["1", "0.25"],
-        default="1",
+        default=None,
     )
 
 
@@ -246,11 +260,21 @@ def predict():
         raise Exception("You need to instantiate a predictor for a specific flux model")
 
     def preprocess(
-        self, aspect_ratio: str, seed: Optional[int], megapixels: str
+        self, size: str, aspect_ratio: str | None, seed: Optional[int], megapixels: str | None
     ) -> Dict:
-        width, height = ASPECT_RATIOS.get(aspect_ratio)
-        if megapixels == "0.25":
-            width, height = width // 2, height // 2
+        width, height = SIZES.get(size)
+
+        # Backwards compatibility for deprecated aspect_ratio and megapixels inputs
+        if aspect_ratio is not None or megapixels is not None:
+            # set defaults
+            if aspect_ratio is None:
+                aspect_ratio = "1024x1024"
+            if megapixels is None:
+                megapixels = "1"
+
+            width, height = ASPECT_RATIOS.get(aspect_ratio)
+            if megapixels == "0.25":
+                width, height = width // 2, height // 2
 
         if not seed:
             seed = int.from_bytes(os.urandom(2), "big")
@@ -468,6 +492,7 @@ def setup(self) -> None:
     def predict(
         self,
         prompt: str = SHARED_INPUTS.prompt,
+        size: str = SHARED_INPUTS.size,
         aspect_ratio: str = SHARED_INPUTS.aspect_ratio,
         num_outputs: int = SHARED_INPUTS.num_outputs,
         num_inference_steps: int = Input(
@@ -483,7 +508,7 @@ def predict(
         go_fast: bool = SHARED_INPUTS.go_fast,
         megapixels: str = SHARED_INPUTS.megapixels,
     ) -> List[Path]:
-        hws_kwargs = self.preprocess(aspect_ratio, seed, megapixels)
+        hws_kwargs = self.preprocess(size, aspect_ratio, seed, megapixels)
 
         if go_fast and not self.disable_fp8:
             imgs, np_imgs = self.fp8_predict(
@@ -518,6 +543,7 @@ def setup(self) -> None:
     def predict(
         self,
         prompt: str = SHARED_INPUTS.prompt,
+        size: str = SHARED_INPUTS.size,
         aspect_ratio: str = SHARED_INPUTS.aspect_ratio,
         image: Path = Input(
             description="Input image for image to image mode. The aspect ratio of your output will match this image",
@@ -549,7 +575,7 @@ def predict(
         if image and go_fast:
             print("img2img not supported with fp8 quantization; running with bf16")
             go_fast = False
-        hws_kwargs = self.preprocess(aspect_ratio, seed, megapixels)
+        hws_kwargs = self.preprocess(size, aspect_ratio, seed, megapixels)
 
         if go_fast and not self.disable_fp8:
             imgs, np_imgs = self.fp8_predict(