First round of dead file removal

experimental/flocking_geese/nacl_app/sprite.cc

-// Copyright (c) 2011 The Native Client Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "nacl_app/sprite.h"
-
-#include <algorithm>
-
-namespace {
-const uint32_t kRedBlueMask = 0x00FF00FF;
-const uint32_t kGreenMask = 0x0000FF00;
-const uint32_t kAlphaMask = 0xFF000000;
-const uint32_t k8x2Scale = 0x800080;
-const uint32_t kPixelOne = 0xFF;
-const uint32_t kAlphaShift = 24;
-
-// Use Blinn & Smith's method of scaling by 256, instead of 255.  Blends two
-// colour channels simultaneously: the R and B of an ARGB pixel.
-// This code expects rb as a packed 16:16 fixed point number, and a as an 8-bit
-// value in [0..255].
-inline uint32_t Blend8x2(uint32_t rb, uint32_t a) {
-  rb &= kRedBlueMask;
-  uint32_t blend = a * rb + k8x2Scale;  // Scale by 256.
-  return (blend + ((blend >> 8) & kRedBlueMask)) >> 8 & kRedBlueMask;
-}
-
-}  // namespace
-
-namespace flocking_geese {
-
-Sprite::Sprite(uint32_t* pixel_buffer,
-               const pp::Size& size,
-               int32_t row_bytes) {
-  SetPixelBuffer(pixel_buffer, size, row_bytes);
-}
-
-void Sprite::SetPixelBuffer(uint32_t* pixel_buffer,
-                            const pp::Size& size,
-                            int32_t row_bytes) {
-  pixel_buffer_.reset(pixel_buffer);
-  pixel_buffer_size_ = size;
-  row_bytes_ = row_bytes ? row_bytes : size.width() * sizeof(uint32_t);
-}
-
-void Sprite::CompositeFromRectToPoint(const pp::Rect& src_rect,
-                                      uint32_t* dest_pixel_buffer,
-                                      const pp::Rect& dest_bounds,
-                                      int32_t dest_row_bytes,
-                                      const pp::Point& dest_point) const {
-  // Clip the source rect to the source image bounds.
-  pp::Rect src_bounds(pp::Point(), size());
-  pp::Rect src_rect_clipped(src_rect.Intersect(src_bounds));
-  if (src_rect_clipped.IsEmpty())
-    return;
-
-  // Create a clipped rect in the destination coordinate space that contains the
-  // final image.
-  pp::Rect draw_rect(dest_point, src_rect_clipped.size());
-  pp::Rect draw_rect_clipped(dest_bounds.Intersect(draw_rect));
-  if (draw_rect_clipped.IsEmpty())
-    return;
-  // Transform the destination rectangle back to the source image coordinate
-  // system: Translate(-dest_point) . Translate(src_rect_clipped.origin).
-  pp::Point src_offset(draw_rect_clipped.point());
-  src_offset -= dest_point;
-  src_rect_clipped.Offset(src_offset);
-  src_rect_clipped.set_size(draw_rect_clipped.size());
-  size_t src_byte_offset = src_rect_clipped.x() * sizeof(uint32_t) +
-                           src_rect_clipped.y() * row_bytes_;
-  const uint8_t* src_pixels =
-      reinterpret_cast<const uint8_t*>(pixel_buffer_.get()) + src_byte_offset;
-
-  if (dest_row_bytes == 0)
-    dest_row_bytes = dest_bounds.width() * sizeof(uint32_t);
-  size_t dest_byte_offset = draw_rect_clipped.point().x() * sizeof(uint32_t) +
-                            draw_rect_clipped.point().y() * dest_row_bytes;
-  uint8_t* dest_pixels = reinterpret_cast<uint8_t*>(dest_pixel_buffer) +
-                         dest_byte_offset;
-
-  // All the pointers are set up, now do the SOver.  Note that the only pre-
-  // multiplied alpha formats are supported.
-  for (int32_t y = 0; y < src_rect_clipped.height(); ++y) {
-    const uint32_t* src_scanline =
-        reinterpret_cast<const uint32_t*>(src_pixels);
-    uint32_t* dest_scanline = reinterpret_cast<uint32_t*>(dest_pixels);
-    for (int32_t x = 0; x < src_rect_clipped.width(); ++x) {
-      uint32_t src = *src_scanline++;
-      uint32_t dst = *dest_scanline;
-      uint32_t alpha = (src >> kAlphaShift) & kPixelOne;
-      uint32_t one_minus_alpha = kPixelOne - alpha;
-      // Compute RB and G separately: this allows for SIMD-like behaviour
-      // when multiplying the channels by alpha.  Note that over-saturated
-      // pixels will wrap to 0 and not clamp.
-      uint32_t dst_rb = Blend8x2(dst, one_minus_alpha);
-      uint32_t dst_ga = Blend8x2(dst >> 8, one_minus_alpha) << 8;
-      *dest_scanline++ = src + dst_rb + dst_ga;
-    }
-    src_pixels += row_bytes_;
-    dest_pixels += dest_row_bytes;
-  }
-}
-
-}  // namespace flocking_geese
-