feat(genai): Add samples for img and thinking generation+sdk update

genai/go.mod

@@ -4,7 +4,7 @@ go 1.24.0
 
 require (
 	github.com/GoogleCloudPlatform/golang-samples v0.0.0-20250201051611-5fb145d1e974
-	google.golang.org/genai v1.17.0
+	google.golang.org/genai v1.25.0
 )
 
 require (

genai/go.sum

@@ -113,8 +113,8 @@ golang.org/x/time v0.9.0 h1:EsRrnYcQiGH+5FfbgvV4AP7qEZstoyrHB0DzarOQ4ZY=
 golang.org/x/time v0.9.0/go.mod h1:3BpzKBy/shNhVucY/MWOyx10tF3SFh9QdLuxbVysPQM=
 google.golang.org/api v0.217.0 h1:GYrUtD289o4zl1AhiTZL0jvQGa2RDLyC+kX1N/lfGOU=
 google.golang.org/api v0.217.0/go.mod h1:qMc2E8cBAbQlRypBTBWHklNJlaZZJBwDv81B1Iu8oSI=
-google.golang.org/genai v1.17.0 h1:lXYSnWShPYjxTouxRj0zF8RsNmSF+SKo7SQ7dM35NlI=
-google.golang.org/genai v1.17.0/go.mod h1:QPj5NGJw+3wEOHg+PrsWwJKvG6UC84ex5FR7qAYsN/M=
+google.golang.org/genai v1.25.0 h1:Cpyh2nmEoOS1eM3mT9XKuA/qWTEDoktfP2gsN3EduPE=
+google.golang.org/genai v1.25.0/go.mod h1:OClfdf+r5aaD+sCd4aUSkPzJItmg2wD/WON9lQnRPaY=
 google.golang.org/genproto v0.0.0-20250115164207-1a7da9e5054f h1:387Y+JbxF52bmesc8kq1NyYIp33dnxCw6eiA7JMsTmw=
 google.golang.org/genproto v0.0.0-20250115164207-1a7da9e5054f/go.mod h1:0joYwWwLQh18AOj8zMYeZLjzuqcYTU3/nC5JdCvC3JI=
 google.golang.org/genproto/googleapis/api v0.0.0-20250115164207-1a7da9e5054f h1:gap6+3Gk41EItBuyi4XX/bp4oqJ3UwuIMl25yGinuAA=

genai/image_generation/image_generation_examples_test.go

@@ -0,0 +1,71 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package image_generation
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/GoogleCloudPlatform/golang-samples/internal/testutil"
+)
+
+func TestImageGeneration(t *testing.T) {
+	tc := testutil.SystemTest(t)
+
+	t.Setenv("GOOGLE_GENAI_USE_VERTEXAI", "1")
+	t.Setenv("GOOGLE_CLOUD_LOCATION", "global")
+	t.Setenv("GOOGLE_CLOUD_PROJECT", tc.ProjectID)
+
+	buf := new(bytes.Buffer)
+
+	t.Run("generate mmflash locale aware image content with text", func(t *testing.T) {
+		buf.Reset()
+		err := generateMMFlashLocaleAwareWithText(buf)
+		if err != nil {
+			t.Fatalf("generateMMFlashLocaleAwareWithText failed: %v", err)
+		}
+
+		output := buf.String()
+		if output == "" {
+			t.Error("expected non-empty output, got empty")
+		}
+	})
+
+	t.Run("generate mmflash multiple images with text", func(t *testing.T) {
+		buf.Reset()
+		err := generateMMFlashMultipleImgsWithText(buf)
+		if err != nil {
+			t.Fatalf("generateMMFlashMultipleImgsWithText failed: %v", err)
+		}
+
+		output := buf.String()
+		if output == "" {
+			t.Error("expected non-empty output, got empty")
+		}
+	})
+
+	t.Run("virtual try-on generation", func(t *testing.T) {
+		buf.Reset()
+		err := generateImgVirtualTryOnWithTextImg(buf)
+		if err != nil {
+			t.Fatalf("generateImgVirtualTryOnWithTextImg failed: %v", err)
+		}
+
+		output := buf.String()
+		if output == "" {
+			t.Error("expected non-empty output, got empty")
+		}
+	})
+}

genai/image_generation/imggen_mmflash_locale_aware_with_txt.go

@@ -0,0 +1,89 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package image_generation shows how to use the GenAI SDK to generate images and text.
+package image_generation
+
+// [START googlegenaisdk_imggen_mmflash_locale_aware_with_txt]
+import (
+	"context"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+
+	"google.golang.org/genai"
+)
+
+// generateMMFlashLocaleAwareWithText demonstrates how to generate an image with locale awareness.
+func generateMMFlashLocaleAwareWithText(w io.Writer) error {
+	ctx := context.Background()
+
+	client, err := genai.NewClient(ctx, &genai.ClientConfig{
+		HTTPOptions: genai.HTTPOptions{APIVersion: "v1"},
+	})
+	if err != nil {
+		return fmt.Errorf("failed to create genai client: %w", err)
+	}
+
+	modelName := "gemini-2.5-flash-image"
+	prompt := "Generate a photo of a breakfast meal."
+	contents := []*genai.Content{
+		{
+			Parts: []*genai.Part{
+				{Text: prompt},
+			},
+			Role: "user",
+		},
+	}
+
+	resp, err := client.Models.GenerateContent(ctx,
+		modelName,
+		contents,
+		&genai.GenerateContentConfig{
+			ResponseModalities: []string{
+				string(genai.ModalityText),
+				string(genai.ModalityImage),
+			},
+		},
+	)
+	if err != nil {
+		return fmt.Errorf("generate content failed: %w", err)
+	}
+
+	if len(resp.Candidates) == 0 || resp.Candidates[0].Content == nil {
+		return fmt.Errorf("no content was generated")
+	}
+
+	outputPath := filepath.Join("testdata", "example-breakfast-meal.png")
+
+	for _, part := range resp.Candidates[0].Content.Parts {
+		switch {
+		case part.Text != "":
+			fmt.Fprintln(w, part.Text)
+		case part.InlineData != nil:
+			if err := os.WriteFile(outputPath, part.InlineData.Data, 0o644); err != nil {
+				return fmt.Errorf("failed to save generated image: %w", err)
+			}
+		}
+	}
+	fmt.Fprintln(w, outputPath)
+
+	// Example response:
+	//  Here is a photo of a delicious breakfast meal for you! ...
+
+	return nil
+}
+
+// [END googlegenaisdk_imggen_mmflash_locale_aware_with_txt]

genai/image_generation/imggen_mmflash_multiple_imgs_with_txt.go

@@ -0,0 +1,102 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package image_generation shows how to use the GenAI SDK to generate images and text.
+package image_generation
+
+// [START googlegenaisdk_imggen_mmflash_multiple_imgs_with_txt]
+import (
+	"context"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+
+	"google.golang.org/genai"
+)
+
+// generateMMFlashMultipleImgsWithText demonstrates how to generate multiple images with text.
+func generateMMFlashMultipleImgsWithText(w io.Writer) error {
+	ctx := context.Background()
+
+	client, err := genai.NewClient(ctx, &genai.ClientConfig{
+		HTTPOptions: genai.HTTPOptions{APIVersion: "v1"},
+	})
+	if err != nil {
+		return fmt.Errorf("failed to create genai client: %w", err)
+	}
+
+	modelName := "gemini-2.5-flash-image"
+	prompt := "Generate 3 images a cat sitting on a chair."
+	contents := []*genai.Content{
+		{
+			Parts: []*genai.Part{
+				{Text: prompt},
+			},
+			Role: "user",
+		},
+	}
+
+	resp, err := client.Models.GenerateContent(ctx,
+		modelName,
+		contents,
+		&genai.GenerateContentConfig{
+			ResponseModalities: []string{
+				string(genai.ModalityText),
+				string(genai.ModalityImage),
+			},
+		},
+	)
+	if err != nil {
+		return fmt.Errorf("generate content failed: %w", err)
+	}
+
+	if len(resp.Candidates) == 0 || resp.Candidates[0].Content == nil {
+		return fmt.Errorf("no content was generated")
+	}
+
+	outputDir := filepath.Join("testdata")
+
+	imageCounter := 1
+	for _, part := range resp.Candidates[0].Content.Parts {
+		switch {
+		case part.Text != "":
+			fmt.Fprintln(w, part.Text)
+		case part.InlineData != nil:
+			filename := filepath.Join(outputDir, fmt.Sprintf("example-cats-0%d.png", imageCounter))
+			if err := os.WriteFile(filename, part.InlineData.Data, 0o644); err != nil {
+				return fmt.Errorf("failed to save generated image: %w", err)
+			}
+			fmt.Fprintln(w, filename)
+			imageCounter++
+		}
+	}
+
+	// Example response:
+	//  Image 1: A fluffy calico cat with striking green eyes is perched elegantly on a vintage wooden
+	//  chair with a woven seat. Sunlight streams through a nearby window, casting soft shadows and
+	//  highlighting the cat's fur.
+	//    #
+	//  Image 2: A sleek black cat with intense yellow eyes is sitting upright on a modern, minimalist
+	//  white chair. The background is a plain grey wall, putting the focus entirely on the feline's
+	//  graceful posture.
+	//    #
+	//  Image 3: A ginger tabby cat with playful amber eyes is comfortably curled up asleep on a plush,
+	//  oversized armchair upholstered in a soft, floral fabric. A corner of a cozy living room with a
+	//  warm lamp in the background can be seen.
+
+	return nil
+}
+
+// [END googlegenaisdk_imggen_mmflash_multiple_imgs_with_txt]

genai/image_generation/imggen_virtual_try_on_with_txt_img.go

@@ -0,0 +1,100 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package image_generation shows how to use the GenAI SDK to generate images and text.
+package image_generation
+
+// [START googlegenaisdk_imggen_virtual_try_on_with_txt_img]
+import (
+	"context"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+
+	"google.golang.org/genai"
+)
+
+// generateImgVirtualTryOnWithTextImg demonstrates how to apply a product image to a person image.
+func generateImgVirtualTryOnWithTextImg(w io.Writer) error {
+	ctx := context.Background()
+
+	client, err := genai.NewClient(ctx, &genai.ClientConfig{
+		HTTPOptions: genai.HTTPOptions{APIVersion: "v1"},
+	})
+	if err != nil {
+		return fmt.Errorf("failed to create genai client: %w", err)
+	}
+
+	modelName := "virtual-try-on-preview-08-04"
+
+	// Load local person image
+	personBytes, err := os.ReadFile("testdata/man.png")
+	if err != nil {
+		return fmt.Errorf("failed to read person image: %w", err)
+	}
+	personImage := &genai.Image{
+		ImageBytes: personBytes,
+		MIMEType:   "image/png",
+	}
+
+	// Load local product image
+	productBytes, err := os.ReadFile("testdata/sweater.jpg")
+	if err != nil {
+		return fmt.Errorf("failed to read product image: %w", err)
+	}
+	productImage := &genai.ProductImage{
+		ProductImage: &genai.Image{
+			ImageBytes: productBytes,
+			MIMEType:   "image/jpeg",
+		},
+	}
+
+	resp, err := client.Models.RecontextImage(ctx,
+		modelName,
+		&genai.RecontextImageSource{
+			PersonImage:   personImage,
+			ProductImages: []*genai.ProductImage{productImage},
+		}, nil,
+	)
+	if err != nil {
+		return fmt.Errorf("recontext image failed: %w", err)
+	}
+
+	// Ensure we have a generated image and save it
+	if len(resp.GeneratedImages) == 0 || resp.GeneratedImages[0].Image == nil {
+		return fmt.Errorf("no image was generated")
+	}
+
+	// TODO(developer): Update below lines
+	path := "testdata"
+	outputFile := "man_in_sweater.png"
+
+	// Save output
+	outputPath := filepath.Join(path, outputFile)
+
+	if err := os.WriteFile(outputPath, resp.GeneratedImages[0].Image.ImageBytes, 0o644); err != nil {
+		return fmt.Errorf("failed to save generated image: %w", err)
+	}
+
+	fmt.Fprintf(w, "Created output image using %d bytes\n", len(resp.GeneratedImages[0].Image.ImageBytes))
+	fmt.Fprintln(w, outputPath)
+
+	// Example response:
+	// Created output image using 1636301 bytes ...
+
+	return nil
+}
+
+// [END googlegenaisdk_imggen_virtual_try_on_with_txt_img]