Split fx_dib part 5

Move more classes into their own files.

Change-Id: Ic505be9e406eafb378235216ea19221ce172f32e
Reviewed-on: https://pdfium-review.googlesource.com/3593
Commit-Queue: Nicolás Peña <npm@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>

1 files changed, 184 insertions, 0 deletions

diff --git a/core/fxge/dib/cfx_imagestretcher.cpp b/core/fxge/dib/cfx_imagestretcher.cpp
new file mode 100644
index 0000000000..799b44432f
--- /dev/null
+++ b/core/fxge/dib/cfx_imagestretcher.cpp
@@ -0,0 +1,184 @@
+// Copyright 2017 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#include "core/fxge/dib/cfx_imagestretcher.h"
+
+#include <climits>
+
+#include "core/fxge/dib/dib_int.h"
+#include "core/fxge/fx_dib.h"
+#include "third_party/base/ptr_util.h"
+
+namespace {
+
+bool SourceSizeWithinLimit(int width, int height) {
+  const int kMaxProgressiveStretchPixels = 1000000;
+  return !height || width < kMaxProgressiveStretchPixels / height;
+}
+
+FXDIB_Format GetStretchedFormat(const CFX_DIBSource& src) {
+  FXDIB_Format format = src.GetFormat();
+  if (format == FXDIB_1bppMask)
+    return FXDIB_8bppMask;
+  if (format == FXDIB_1bppRgb)
+    return FXDIB_8bppRgb;
+  if (format == FXDIB_8bppRgb && src.GetPalette())
+    return FXDIB_Rgb;
+  return format;
+}
+
+}  // namespace
+
+CFX_ImageStretcher::CFX_ImageStretcher(
+    IFX_ScanlineComposer* pDest,
+    const CFX_RetainPtr<CFX_DIBSource>& pSource,
+    int dest_width,
+    int dest_height,
+    const FX_RECT& bitmap_rect,
+    uint32_t flags)
+    : m_pDest(pDest),
+      m_pSource(pSource),
+      m_Flags(flags),
+      m_bFlipX(false),
+      m_bFlipY(false),
+      m_DestWidth(dest_width),
+      m_DestHeight(dest_height),
+      m_ClipRect(bitmap_rect),
+      m_DestFormat(GetStretchedFormat(*pSource)),
+      m_DestBPP(m_DestFormat & 0xff),
+      m_LineIndex(0) {}
+
+CFX_ImageStretcher::~CFX_ImageStretcher() {}
+
+bool CFX_ImageStretcher::Start() {
+  if (m_DestWidth == 0 || m_DestHeight == 0)
+    return false;
+
+  if (m_pSource->GetFormat() == FXDIB_1bppRgb && m_pSource->GetPalette()) {
+    FX_ARGB pal[256];
+    int a0, r0, g0, b0, a1, r1, g1, b1;
+    ArgbDecode(m_pSource->GetPaletteEntry(0), a0, r0, g0, b0);
+    ArgbDecode(m_pSource->GetPaletteEntry(1), a1, r1, g1, b1);
+    for (int i = 0; i < 256; i++) {
+      int a = a0 + (a1 - a0) * i / 255;
+      int r = r0 + (r1 - r0) * i / 255;
+      int g = g0 + (g1 - g0) * i / 255;
+      int b = b0 + (b1 - b0) * i / 255;
+      pal[i] = ArgbEncode(a, r, g, b);
+    }
+    if (!m_pDest->SetInfo(m_ClipRect.Width(), m_ClipRect.Height(), m_DestFormat,
+                          pal)) {
+      return false;
+    }
+  } else if (m_pSource->GetFormat() == FXDIB_1bppCmyk &&
+             m_pSource->GetPalette()) {
+    FX_CMYK pal[256];
+    int c0, m0, y0, k0, c1, m1, y1, k1;
+    CmykDecode(m_pSource->GetPaletteEntry(0), c0, m0, y0, k0);
+    CmykDecode(m_pSource->GetPaletteEntry(1), c1, m1, y1, k1);
+    for (int i = 0; i < 256; i++) {
+      int c = c0 + (c1 - c0) * i / 255;
+      int m = m0 + (m1 - m0) * i / 255;
+      int y = y0 + (y1 - y0) * i / 255;
+      int k = k0 + (k1 - k0) * i / 255;
+      pal[i] = CmykEncode(c, m, y, k);
+    }
+    if (!m_pDest->SetInfo(m_ClipRect.Width(), m_ClipRect.Height(), m_DestFormat,
+                          pal)) {
+      return false;
+    }
+  } else if (!m_pDest->SetInfo(m_ClipRect.Width(), m_ClipRect.Height(),
+                               m_DestFormat, nullptr)) {
+    return false;
+  }
+
+  if (m_Flags & FXDIB_DOWNSAMPLE)
+    return StartQuickStretch();
+  return StartStretch();
+}
+
+bool CFX_ImageStretcher::Continue(IFX_Pause* pPause) {
+  if (m_Flags & FXDIB_DOWNSAMPLE)
+    return ContinueQuickStretch(pPause);
+  return ContinueStretch(pPause);
+}
+
+bool CFX_ImageStretcher::StartStretch() {
+  m_pStretchEngine = pdfium::MakeUnique<CStretchEngine>(
+      m_pDest, m_DestFormat, m_DestWidth, m_DestHeight, m_ClipRect, m_pSource,
+      m_Flags);
+  m_pStretchEngine->StartStretchHorz();
+  if (SourceSizeWithinLimit(m_pSource->GetWidth(), m_pSource->GetHeight())) {
+    m_pStretchEngine->Continue(nullptr);
+    return false;
+  }
+  return true;
+}
+
+bool CFX_ImageStretcher::ContinueStretch(IFX_Pause* pPause) {
+  return m_pStretchEngine && m_pStretchEngine->Continue(pPause);
+}
+
+bool CFX_ImageStretcher::StartQuickStretch() {
+  if (m_DestWidth < 0) {
+    m_bFlipX = true;
+    m_DestWidth = -m_DestWidth;
+  }
+  if (m_DestHeight < 0) {
+    m_bFlipY = true;
+    m_DestHeight = -m_DestHeight;
+  }
+  uint32_t size = m_ClipRect.Width();
+  if (size && m_DestBPP > static_cast<int>(INT_MAX / size))
+    return false;
+
+  size *= m_DestBPP;
+  m_pScanline.reset(FX_Alloc(uint8_t, (size / 8 + 3) / 4 * 4));
+  if (m_pSource->m_pAlphaMask)
+    m_pMaskScanline.reset(FX_Alloc(uint8_t, (m_ClipRect.Width() + 3) / 4 * 4));
+
+  if (SourceSizeWithinLimit(m_pSource->GetWidth(), m_pSource->GetHeight())) {
+    ContinueQuickStretch(nullptr);
+    return false;
+  }
+  return true;
+}
+
+bool CFX_ImageStretcher::ContinueQuickStretch(IFX_Pause* pPause) {
+  if (!m_pScanline)
+    return false;
+
+  int result_width = m_ClipRect.Width();
+  int result_height = m_ClipRect.Height();
+  int src_height = m_pSource->GetHeight();
+  for (; m_LineIndex < result_height; m_LineIndex++) {
+    int dest_y;
+    int src_y;
+    if (m_bFlipY) {
+      dest_y = result_height - m_LineIndex - 1;
+      src_y = (m_DestHeight - (dest_y + m_ClipRect.top) - 1) * src_height /
+              m_DestHeight;
+    } else {
+      dest_y = m_LineIndex;
+      src_y = (dest_y + m_ClipRect.top) * src_height / m_DestHeight;
+    }
+    src_y = pdfium::clamp(src_y, 0, src_height - 1);
+
+    if (m_pSource->SkipToScanline(src_y, pPause))
+      return true;
+
+    m_pSource->DownSampleScanline(src_y, m_pScanline.get(), m_DestBPP,
+                                  m_DestWidth, m_bFlipX, m_ClipRect.left,
+                                  result_width);
+    if (m_pMaskScanline) {
+      m_pSource->m_pAlphaMask->DownSampleScanline(
+          src_y, m_pMaskScanline.get(), 1, m_DestWidth, m_bFlipX,
+          m_ClipRect.left, result_width);
+    }
+    m_pDest->ComposeScanline(dest_y, m_pScanline.get(), m_pMaskScanline.get());
+  }
+  return false;
+}