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path: root/src/pkg/image/decode_example_test.go
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Diffstat (limited to 'src/pkg/image/decode_example_test.go')
-rw-r--r--src/pkg/image/decode_example_test.go140
1 files changed, 0 insertions, 140 deletions
diff --git a/src/pkg/image/decode_example_test.go b/src/pkg/image/decode_example_test.go
deleted file mode 100644
index 21e90fea4..000000000
--- a/src/pkg/image/decode_example_test.go
+++ /dev/null
@@ -1,140 +0,0 @@
-// Copyright 2012 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// This example demonstrates decoding a JPEG image and examining its pixels.
-package image_test
-
-import (
- "encoding/base64"
- "fmt"
- "image"
- "log"
- "strings"
-
- // Package image/jpeg is not used explicitly in the code below,
- // but is imported for its initialization side-effect, which allows
- // image.Decode to understand JPEG formatted images. Uncomment these
- // two lines to also understand GIF and PNG images:
- // _ "image/gif"
- // _ "image/png"
- _ "image/jpeg"
-)
-
-func Example() {
- // Decode the JPEG data. If reading from file, create a reader with
- //
- // reader, err := os.Open("testdata/video-001.q50.420.jpeg")
- // if err != nil {
- // log.Fatal(err)
- // }
- // defer reader.Close()
- reader := base64.NewDecoder(base64.StdEncoding, strings.NewReader(data))
- m, _, err := image.Decode(reader)
- if err != nil {
- log.Fatal(err)
- }
- bounds := m.Bounds()
-
- // Calculate a 16-bin histogram for m's red, green, blue and alpha components.
- //
- // An image's bounds do not necessarily start at (0, 0), so the two loops start
- // at bounds.Min.Y and bounds.Min.X. Looping over Y first and X second is more
- // likely to result in better memory access patterns than X first and Y second.
- var histogram [16][4]int
- for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
- for x := bounds.Min.X; x < bounds.Max.X; x++ {
- r, g, b, a := m.At(x, y).RGBA()
- // A color's RGBA method returns values in the range [0, 65535].
- // Shifting by 12 reduces this to the range [0, 15].
- histogram[r>>12][0]++
- histogram[g>>12][1]++
- histogram[b>>12][2]++
- histogram[a>>12][3]++
- }
- }
-
- // Print the results.
- fmt.Printf("%-14s %6s %6s %6s %6s\n", "bin", "red", "green", "blue", "alpha")
- for i, x := range histogram {
- fmt.Printf("0x%04x-0x%04x: %6d %6d %6d %6d\n", i<<12, (i+1)<<12-1, x[0], x[1], x[2], x[3])
- }
- // Output:
- // bin red green blue alpha
- // 0x0000-0x0fff: 353 759 7228 0
- // 0x1000-0x1fff: 629 2944 1036 0
- // 0x2000-0x2fff: 1075 2319 984 0
- // 0x3000-0x3fff: 838 2291 988 0
- // 0x4000-0x4fff: 540 1302 542 0
- // 0x5000-0x5fff: 319 971 263 0
- // 0x6000-0x6fff: 316 377 178 0
- // 0x7000-0x7fff: 581 280 216 0
- // 0x8000-0x8fff: 3457 228 274 0
- // 0x9000-0x9fff: 2294 237 334 0
- // 0xa000-0xafff: 938 283 370 0
- // 0xb000-0xbfff: 322 338 401 0
- // 0xc000-0xcfff: 229 386 295 0
- // 0xd000-0xdfff: 263 416 281 0
- // 0xe000-0xefff: 538 433 312 0
- // 0xf000-0xffff: 2758 1886 1748 15450
-}
-
-const data = `
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-`