Fix Red/Blue decoding problem in WebP.

Added unit test with lossless webp data.

BUG=skia:1402

Will need to rebaseline webp expectations for some systems.

R=scroggo@google.com

Review URL: https://codereview.chromium.org/105443005

git-svn-id: http://skia.googlecode.com/svn/trunk@12803 2bbb7eff-a529-9590-31e7-b0007b416f81

src/images/SkImageDecoder_libwebp.cpp

@@ -173,7 +173,13 @@ static WEBP_CSP_MODE webp_decode_mode(const SkBitmap* decodedBitmap, bool premul
     SkBitmap::Config config = decodedBitmap->config();
 
     if (config == SkBitmap::kARGB_8888_Config) {
-        mode = premultiply ? MODE_rgbA : MODE_RGBA;
+        #if SK_PMCOLOR_BYTE_ORDER(B,G,R,A)
+            mode = premultiply ? MODE_bgrA : MODE_BGRA;
+        #elif SK_PMCOLOR_BYTE_ORDER(R,G,B,A)
+            mode = premultiply ? MODE_rgbA : MODE_RGBA;
+        #else
+            #error "Skia uses BGRA or RGBA byte order"
+        #endif
     } else if (config == SkBitmap::kARGB_4444_Config) {
         mode = premultiply ? MODE_rgbA_4444 : MODE_RGBA_4444;
     } else if (config == SkBitmap::kRGB_565_Config) {

tests/ImageDecodingTest.cpp

@@ -12,6 +12,7 @@
 #include "SkColor.h"
 #include "SkColorPriv.h"
 #include "SkData.h"
+#include "SkDecodingImageGenerator.h"
 #include "SkForceLinking.h"
 #include "SkGradientShader.h"
 #include "SkImageDecoder.h"
@@ -236,3 +237,76 @@ DEF_TEST(ImageDecoding, reporter) {
     test_row_proc_choice();
 #endif
 }
+
+////////////////////////////////////////////////////////////////////////////////
+
+DEF_TEST(WebP, reporter) {
+    const unsigned char encodedWebP[] = {
+        0x52, 0x49, 0x46, 0x46, 0x2c, 0x01, 0x00, 0x00, 0x57, 0x45, 0x42, 0x50,
+        0x56, 0x50, 0x38, 0x4c, 0x20, 0x01, 0x00, 0x00, 0x2f, 0x07, 0xc0, 0x01,
+        0x00, 0xff, 0x01, 0x45, 0x03, 0x00, 0xe2, 0xd5, 0xae, 0x60, 0x2b, 0xad,
+        0xd9, 0x68, 0x76, 0xb6, 0x8d, 0x6a, 0x1d, 0xc0, 0xe6, 0x19, 0xd6, 0x16,
+        0xb7, 0xb4, 0xef, 0xcf, 0xc3, 0x15, 0x6c, 0xb3, 0xbd, 0x77, 0x0d, 0x85,
+        0x6d, 0x1b, 0xa9, 0xb1, 0x2b, 0xdc, 0x3d, 0x83, 0xdb, 0x00, 0x00, 0xc8,
+        0x26, 0xe5, 0x01, 0x99, 0x8a, 0xd5, 0xdd, 0xfc, 0x82, 0xcd, 0xcd, 0x9a,
+        0x8c, 0x13, 0xcc, 0x1b, 0xba, 0xf5, 0x05, 0xdb, 0xee, 0x6a, 0xdb, 0x38,
+        0x60, 0xfe, 0x43, 0x2c, 0xd4, 0x6a, 0x99, 0x4d, 0xc6, 0xc0, 0xd3, 0x28,
+        0x1b, 0xc1, 0xb1, 0x17, 0x4e, 0x43, 0x0e, 0x3d, 0x27, 0xe9, 0xe4, 0x84,
+        0x4f, 0x24, 0x62, 0x69, 0x85, 0x43, 0x8d, 0xc2, 0x04, 0x00, 0x07, 0x59,
+        0x60, 0xfd, 0x8b, 0x4d, 0x60, 0x32, 0x72, 0xcf, 0x88, 0x0c, 0x2f, 0x2f,
+        0xad, 0x62, 0xbd, 0x27, 0x09, 0x16, 0x70, 0x78, 0x6c, 0xd9, 0x82, 0xef,
+        0x1a, 0xa2, 0xcc, 0xf0, 0xf1, 0x6f, 0xd8, 0x78, 0x2e, 0x39, 0xa1, 0xcf,
+        0x14, 0x4b, 0x89, 0xb4, 0x1b, 0x48, 0x15, 0x7c, 0x48, 0x6f, 0x8c, 0x20,
+        0xb7, 0x00, 0xcf, 0xfc, 0xdb, 0xd0, 0xe9, 0xe7, 0x42, 0x09, 0xa4, 0x03,
+        0x40, 0xac, 0xda, 0x40, 0x01, 0x00, 0x5f, 0xa1, 0x3d, 0x64, 0xe1, 0xf4,
+        0x03, 0x45, 0x29, 0xe0, 0xe2, 0x4a, 0xc3, 0xa2, 0xe8, 0xe0, 0x25, 0x12,
+        0x74, 0xc6, 0xe8, 0xfb, 0x93, 0x4f, 0x9f, 0x5e, 0xc0, 0xa6, 0x91, 0x1b,
+        0xa4, 0x24, 0x82, 0xc3, 0x61, 0x07, 0x4c, 0x49, 0x4f, 0x53, 0xae, 0x5f,
+        0x5d, 0x39, 0x36, 0xc0, 0x5b, 0x57, 0x54, 0x60, 0x10, 0x00, 0x00, 0xd1,
+        0x68, 0xb6, 0x6d, 0xdb, 0x36, 0x22, 0xfa, 0x1f, 0x35, 0x75, 0x22, 0xec,
+        0x31, 0xbc, 0x5d, 0x8f, 0x87, 0x53, 0xa2, 0x05, 0x8c, 0x2f, 0xcd, 0xa8,
+        0xa7, 0xf3, 0xa3, 0xbd, 0x83, 0x8b, 0x2a, 0xc8, 0x58, 0xf5, 0xac, 0x80,
+        0xe3, 0xfe, 0x66, 0xa4, 0x7c, 0x1b, 0x6c, 0xd1, 0xa9, 0xd8, 0x14, 0xd0,
+        0xc5, 0xb5, 0x39, 0x71, 0x97, 0x19, 0x19, 0x1b
+    };
+    const SkColor thePixels[]  = {
+        0xffbba570, 0xff395f5d, 0xffe25c39, 0xff197666,
+        0xff3cba27, 0xffdefcb0, 0xffc13874, 0xfffa0093,
+        0xffbda60e, 0xffc01db6, 0xff2bd688, 0xff9362d4,
+        0xffc641b2, 0xffa5cede, 0xff606eba, 0xff8f4bf3,
+        0xff3bf742, 0xff8f02a8, 0xff5509df, 0xffc7027e,
+        0xff24aa8a, 0xff886c96, 0xff625481, 0xff403689,
+        0xffc52152, 0xff78ccd6, 0xffdcb4ab, 0xff09d27d,
+        0xffca00f3, 0xff605d47, 0xff446fb2, 0xff576e46,
+        0xff273df9, 0xffb41a83, 0xfff812c3, 0xffccab67,
+        0xff034218, 0xff7db9a7, 0xff821048, 0xfffe4ab4,
+        0xff6fac98, 0xff941d27, 0xff5fe411, 0xfffbb283,
+        0xffd86e99, 0xff169162, 0xff71128c, 0xff39cab4,
+        0xffa7fe63, 0xff4c956b, 0xffbc22e0, 0xffb272e4,
+        0xff129f4a, 0xffe34513, 0xff3d3742, 0xffbd190a,
+        0xffb07222, 0xff2e23f8, 0xfff089d9, 0xffb35738,
+        0xffa86022, 0xff3340fe, 0xff95fe71, 0xff6a71df
+    };
+    SkAutoDataUnref encoded(SkData::NewWithCopy(encodedWebP,
+                                                sizeof(encodedWebP)));
+    SkBitmap bm;
+    bool success = SkDecodingImageGenerator::Install(encoded, &bm, NULL);
+    REPORTER_ASSERT(reporter, success);
+    if (!success) {
+        return;
+    }
+    SkAutoLockPixels alp(bm);
+    bool rightSize = SK_ARRAY_COUNT(thePixels) == bm.width() * bm.height();
+    REPORTER_ASSERT(reporter, rightSize);
+    if (rightSize) {
+        bool error = false;
+        const SkColor* correctPixel = thePixels;
+        for (int y = 0; y < bm.height(); ++y) {
+            for (int x = 0; x < bm.width(); ++x) {
+                error |= (*correctPixel != bm.getColor(x, y));
+                ++correctPixel;
+            }
+        }
+        REPORTER_ASSERT(reporter, !error);
+    }
+}