Sketch DM refactor.

dm/DMUtil.cpp

-#include "DMUtil.h"
-
-#include "SkColorPriv.h"
-#include "SkCommandLineFlags.h"
-#include "SkPicture.h"
-#include "SkPictureRecorder.h"
-
-DEFINE_string(matrix, "1 0 0 0 1 0 0 0 1",
-              "Matrix to apply to the canvas before drawing.");
-
-namespace DM {
-
-void CanvasPreflight(SkCanvas* canvas) {
-    if (FLAGS_matrix.count() == 9) {
-        SkMatrix m;
-        for (int i = 0; i < 9; i++) {
-            m[i] = (SkScalar)atof(FLAGS_matrix[i]);
-        }
-        canvas->concat(m);
-    }
-}
-
-SkString UnderJoin(const char* a, const char* b) {
-    SkString s;
-    s.appendf("%s_%s", a, b);
-    return s;
-}
-
-SkString FileToTaskName(SkString filename) {
-    for (size_t i = 0; i < filename.size(); i++) {
-        if ('_' == filename[i]) { filename[i] = '-'; }
-        if ('.' == filename[i]) { filename[i] = '_'; }
-    }
-    return filename;
-}
-
-SkPicture* RecordPicture(skiagm::GM* gm, SkBBHFactory* factory) {
-    const SkScalar w = SkIntToScalar(gm->getISize().width()),
-                   h = SkIntToScalar(gm->getISize().height());
-    SkPictureRecorder recorder;
-
-    SkCanvas* canvas = recorder.beginRecording(w, h, factory);
-    CanvasPreflight(canvas);
-    canvas->concat(gm->getInitialTransform());
-    gm->draw(canvas);
-    canvas->flush();
-    return recorder.endRecording();
-}
-
-void AllocatePixels(SkColorType ct, int width, int height, SkBitmap* bitmap) {
-    bitmap->allocPixels(SkImageInfo::Make(width, height, ct, kPremul_SkAlphaType));
-    bitmap->eraseColor(0x00000000);
-}
-
-void AllocatePixels(const SkBitmap& reference, SkBitmap* bitmap) {
-    AllocatePixels(reference.colorType(), reference.width(), reference.height(), bitmap);
-}
-
-void DrawPicture(const SkPicture& picture, SkBitmap* bitmap) {
-    SkASSERT(bitmap != NULL);
-    SkCanvas canvas(*bitmap);
-    canvas.drawPicture(&picture);
-    canvas.flush();
-}
-
-static void unpack_565(uint16_t pixel, unsigned* r, unsigned* g, unsigned* b) {
-    *r = SkGetPackedR16(pixel);
-    *g = SkGetPackedG16(pixel);
-    *b = SkGetPackedB16(pixel);
-}
-
-// Returns |a-b|.
-static unsigned abs_diff(unsigned a, unsigned b) {
-    return a > b ? a - b : b - a;
-}
-
-unsigned MaxComponentDifference(const SkBitmap& a, const SkBitmap& b) {
-    if (a.info() != b.info()) {
-        SkFAIL("Can't compare bitmaps of different shapes.");
-    }
-
-    unsigned max = 0;
-
-    const SkAutoLockPixels lockA(a), lockB(b);
-    if (a.info().colorType() == kRGB_565_SkColorType) {
-        // 565 is special/annoying because its 3 components straddle 2 bytes.
-        const uint16_t* aPixels = (const uint16_t*)a.getPixels();
-        const uint16_t* bPixels = (const uint16_t*)b.getPixels();
-        for (size_t i = 0; i < a.getSize() / 2; i++) {
-            unsigned ar, ag, ab,
-                     br, bg, bb;
-            unpack_565(aPixels[i], &ar, &ag, &ab);
-            unpack_565(bPixels[i], &br, &bg, &bb);
-            max = SkTMax(max, abs_diff(ar, br));
-            max = SkTMax(max, abs_diff(ag, bg));
-            max = SkTMax(max, abs_diff(ab, bb));
-        }
-    } else {
-        // Everything else we produce is byte aligned, so max component diff == max byte diff.
-        const uint8_t* aBytes = (const uint8_t*)a.getPixels();
-        const uint8_t* bBytes = (const uint8_t*)b.getPixels();
-        for (size_t i = 0; i < a.getSize(); i++) {
-            max = SkTMax(max, abs_diff(aBytes[i], bBytes[i]));
-        }
-    }
-
-    return max;
-}
-
-bool BitmapsEqual(const SkBitmap& a, const SkBitmap& b) {
-    if (a.info() != b.info()) {
-        return false;
-    }
-    const SkAutoLockPixels lockA(a), lockB(b);
-    return 0 == memcmp(a.getPixels(), b.getPixels(), a.getSize());
-}
-
-}  // namespace DM