The Tor Browser: gfx/skia/trunk/src/core/SkBlitter

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /*

     2  * Copyright 2006 The Android Open Source Project

     3  *

     4  * Use of this source code is governed by a BSD-style license that can be

     5  * found in the LICENSE file.

     6  */

     8 #include "SkSmallAllocator.h"

     9 #include "SkSpriteBlitter.h"

    11 SkSpriteBlitter::SkSpriteBlitter(const SkBitmap& source)

    12         : fSource(&source) {

    13     fSource->lockPixels();

    14 }

    16 SkSpriteBlitter::~SkSpriteBlitter() {

    17     fSource->unlockPixels();

    18 }

    20 void SkSpriteBlitter::setup(const SkBitmap& device, int left, int top,

    21                             const SkPaint& paint) {

    22     fDevice = &device;

    23     fLeft = left;

    24     fTop = top;

    25     fPaint = &paint;

    26 }

    28 #ifdef SK_DEBUG

    29 void SkSpriteBlitter::blitH(int x, int y, int width) {

    30     SkDEBUGFAIL("how did we get here?");

    31 }

    33 void SkSpriteBlitter::blitAntiH(int x, int y, const SkAlpha antialias[],

    34                                 const int16_t runs[]) {

    35     SkDEBUGFAIL("how did we get here?");

    36 }

    38 void SkSpriteBlitter::blitV(int x, int y, int height, SkAlpha alpha) {

    39     SkDEBUGFAIL("how did we get here?");

    40 }

    42 void SkSpriteBlitter::blitMask(const SkMask&, const SkIRect& clip) {

    43     SkDEBUGFAIL("how did we get here?");

    44 }

    45 #endif

    47 ///////////////////////////////////////////////////////////////////////////////

    49 // returning null means the caller will call SkBlitter::Choose() and

    50 // have wrapped the source bitmap inside a shader

    51 SkBlitter* SkBlitter::ChooseSprite(const SkBitmap& device, const SkPaint& paint,

    52         const SkBitmap& source, int left, int top, SkTBlitterAllocator* allocator) {

    53     /*  We currently ignore antialiasing and filtertype, meaning we will take our

    54         special blitters regardless of these settings. Ignoring filtertype seems fine

    55         since by definition there is no scale in the matrix. Ignoring antialiasing is

    56         a bit of a hack, since we "could" pass in the fractional left/top for the bitmap,

    57         and respect that by blending the edges of the bitmap against the device. To support

    58         this we could either add more special blitters here, or detect antialiasing in the

    59         paint and return null if it is set, forcing the client to take the slow shader case

    60         (which does respect soft edges).

    61     */

    62     SkASSERT(allocator != NULL);

    64     SkSpriteBlitter* blitter;

    66     switch (device.colorType()) {

    67         case kRGB_565_SkColorType:

    68             blitter = SkSpriteBlitter::ChooseD16(source, paint, allocator);

    69             break;

    70         case kPMColor_SkColorType:

    71             blitter = SkSpriteBlitter::ChooseD32(source, paint, allocator);

    72             break;

    73         default:

    74             blitter = NULL;

    75             break;

    76     }

    78     if (blitter) {

    79         blitter->setup(device, left, top, paint);

    80     }

    81     return blitter;

    82 }

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