C++ CPDF_Page::GetPageHeight方法代码示例

static void nativeSetTransformAndClip(JNIEnv* env, jclass thiz, jlong documentPtr, jint pageIndex,
        jlong transformPtr, jint clipLeft, jint clipTop, jint clipRight, jint clipBottom) {
    FPDF_DOCUMENT document = reinterpret_cast<FPDF_DOCUMENT>(documentPtr);

    CPDF_Page* page = (CPDF_Page*) FPDF_LoadPage(document, pageIndex);
    if (!page) {
        jniThrowException(env, "java/lang/IllegalStateException",
                "cannot open page");
        return;
    }

    double width = 0;
    double height = 0;

    const int result = FPDF_GetPageSizeByIndex(document, pageIndex, &width, &height);
    if (!result) {
        jniThrowException(env, "java/lang/IllegalStateException",
                    "cannot get page size");
        return;
    }

    CFX_AffineMatrix matrix;

    SkMatrix* skTransform = reinterpret_cast<SkMatrix*>(transformPtr);

    SkScalar transformValues[6];
    if (!skTransform->asAffine(transformValues)) {
        jniThrowException(env, "java/lang/IllegalArgumentException",
                "transform matrix has perspective. Only affine matrices are allowed.");
        return;
    }

    // PDF's coordinate system origin is left-bottom while in graphics it
    // is the top-left. So, translate the PDF coordinates to ours.
    matrix.Set(1, 0, 0, -1, 0, page->GetPageHeight());

    // Apply the transformation what was created in our coordinates.
    matrix.Concat(transformValues[SkMatrix::kAScaleX], transformValues[SkMatrix::kASkewY],
            transformValues[SkMatrix::kASkewX], transformValues[SkMatrix::kAScaleY],
            transformValues[SkMatrix::kATransX], transformValues[SkMatrix::kATransY]);

    // Translate the result back to PDF coordinates.
    matrix.Concat(1, 0, 0, -1, 0, page->GetPageHeight());

    FS_MATRIX transform = {matrix.a, matrix.b, matrix.c, matrix.d, matrix.e, matrix.f};
    FS_RECTF clip = {(float) clipLeft, (float) clipTop, (float) clipRight, (float) clipBottom};

    FPDFPage_TransFormWithClip(page, &transform, &clip);

    FPDF_ClosePage(page);
}

void CFFL_InteractiveFormFiller::QueryWherePopup(
    const CPWL_Wnd::PrivateData* pAttached,
    float fPopupMin,
    float fPopupMax,
    bool* bBottom,
    float* fPopupRet) {
  auto* pData = static_cast<const CFFL_PrivateData*>(pAttached);
  CPDFSDK_Widget* pWidget = pData->pWidget;
  CPDF_Page* pPage = pWidget->GetPDFPage();

  CFX_FloatRect rcPageView(0, pPage->GetPageHeight(), pPage->GetPageWidth(), 0);
  rcPageView.Normalize();

  CFX_FloatRect rcAnnot = pWidget->GetRect();
  float fTop = 0.0f;
  float fBottom = 0.0f;
  switch (pWidget->GetRotate() / 90) {
    default:
    case 0:
      fTop = rcPageView.top - rcAnnot.top;
      fBottom = rcAnnot.bottom - rcPageView.bottom;
      break;
    case 1:
      fTop = rcAnnot.left - rcPageView.left;
      fBottom = rcPageView.right - rcAnnot.right;
      break;
    case 2:
      fTop = rcAnnot.bottom - rcPageView.bottom;
      fBottom = rcPageView.top - rcAnnot.top;
      break;
    case 3:
      fTop = rcPageView.right - rcAnnot.right;
      fBottom = rcAnnot.left - rcPageView.left;
      break;
  }

  constexpr float kMaxListBoxHeight = 140;
  const float fMaxListBoxHeight =
      pdfium::clamp(kMaxListBoxHeight, fPopupMin, fPopupMax);

  if (fBottom > fMaxListBoxHeight) {
    *fPopupRet = fMaxListBoxHeight;
    *bBottom = true;
    return;
  }

  if (fTop > fMaxListBoxHeight) {
    *fPopupRet = fMaxListBoxHeight;
    *bBottom = false;
    return;
  }

  if (fTop > fBottom) {
    *fPopupRet = fTop;
    *bBottom = false;
  } else {
    *fPopupRet = fBottom;
    *bBottom = true;
  }
}

static void CheckRotate(CPDF_Page& page, CFX_FloatRect& page_bbox)
{
    int total_count = 0, rotated_count[3] = {0, 0, 0};
    FX_POSITION pos = page.GetFirstObjectPosition();
    while (pos) {
        CPDF_PageObject* pObj = page.GetNextObject(pos);
        if (pObj->m_Type != PDFPAGE_TEXT) {
            continue;
        }
        total_count ++;
        CPDF_TextObject* pText = (CPDF_TextObject*)pObj;
        FX_FLOAT angle = pText->m_TextState.GetBaselineAngle();
        if (angle == 0.0) {
            continue;
        }
        int degree = (int)(angle * 180 / PI + 0.5);
        if (degree % 90) {
            continue;
        }
        if (degree < 0) {
            degree += 360;
        }
        int index = degree / 90 % 3 - 1;
        if (index < 0) {
            continue;
        }
        rotated_count[index] ++;
    }
    if (total_count == 0) {
        return;
    }
    CFX_AffineMatrix matrix;
    if (rotated_count[0] > total_count * 2 / 3) {
        matrix.Set(0, -1, 1, 0, 0, page.GetPageHeight());
    } else if (rotated_count[1] > total_count * 2 / 3) {
        matrix.Set(-1, 0, 0, -1, page.GetPageWidth(), page.GetPageHeight());
    } else if (rotated_count[2] > total_count * 2 / 3) {
        matrix.Set(0, 1, -1, 0, page.GetPageWidth(), 0);
    } else {
        return;
    }
    page.Transform(matrix);
    page_bbox.Transform(&matrix);
}

DLLEXPORT int STDCALL FPDF_GetPageSizeByIndex(FPDF_DOCUMENT document, int page_index, double* width, double* height)
{
    CPDF_Document* pDoc = (CPDF_Document*)document;
    if(pDoc == NULL)
        return FALSE;

    CPDF_Dictionary* pDict = pDoc->GetPage(page_index);
    if (pDict == NULL) return FALSE;

    CPDF_Page page;
    page.Load(pDoc, pDict);
    *width = page.GetPageWidth();
    *height = page.GetPageHeight();

    return TRUE;
}

static void renderPageBitmap(FPDF_BITMAP bitmap, FPDF_PAGE page, int destLeft, int destTop,
        int destRight, int destBottom, SkMatrix* transform, int flags) {
    // Note: this code ignores the currently unused RENDER_NO_NATIVETEXT,
    // FPDF_RENDER_LIMITEDIMAGECACHE, FPDF_RENDER_FORCEHALFTONE, FPDF_GRAYSCALE,
    // and FPDF_ANNOT flags. To add support for that refer to FPDF_RenderPage_Retail
    // in fpdfview.cpp

    CRenderContext* pContext = FX_NEW CRenderContext;

    CPDF_Page* pPage = (CPDF_Page*) page;
    pPage->SetPrivateData((void*) 1, pContext, DropContext);

    CFX_FxgeDevice* fxgeDevice = FX_NEW CFX_FxgeDevice;
    pContext->m_pDevice = fxgeDevice;

    // Reverse the bytes (last argument TRUE) since the Android
    // format is ARGB while the renderer uses BGRA internally.
    fxgeDevice->Attach((CFX_DIBitmap*) bitmap, 0, TRUE);

    CPDF_RenderOptions* renderOptions = pContext->m_pOptions;

    if (!renderOptions) {
        renderOptions = FX_NEW CPDF_RenderOptions;
        pContext->m_pOptions = renderOptions;
    }

    if (flags & FPDF_LCD_TEXT) {
        renderOptions->m_Flags |= RENDER_CLEARTYPE;
    } else {
        renderOptions->m_Flags &= ~RENDER_CLEARTYPE;
    }

    const CPDF_OCContext::UsageType usage = (flags & FPDF_PRINTING)
            ? CPDF_OCContext::Print : CPDF_OCContext::View;

    renderOptions->m_AddFlags = flags >> 8;
    renderOptions->m_pOCContext = new CPDF_OCContext(pPage->m_pDocument, usage);

    fxgeDevice->SaveState();

    FX_RECT clip;
    clip.left = destLeft;
    clip.right = destRight;
    clip.top = destTop;
    clip.bottom = destBottom;
    fxgeDevice->SetClip_Rect(&clip);

    CPDF_RenderContext* pageContext = FX_NEW CPDF_RenderContext;
    pContext->m_pContext = pageContext;
    pageContext->Create(pPage);

    CFX_AffineMatrix matrix;
    if (!transform) {
        pPage->GetDisplayMatrix(matrix, destLeft, destTop, destRight - destLeft,
                destBottom - destTop, 0);
    } else {
        // PDF's coordinate system origin is left-bottom while
        // in graphics it is the top-left, so remap the origin.
        matrix.Set(1, 0, 0, -1, 0, pPage->GetPageHeight());

        SkScalar transformValues[6];
        transform->asAffine(transformValues);

        matrix.Concat(transformValues[SkMatrix::kAScaleX], transformValues[SkMatrix::kASkewY],
                transformValues[SkMatrix::kASkewX], transformValues[SkMatrix::kAScaleY],
                transformValues[SkMatrix::kATransX], transformValues[SkMatrix::kATransY]);
    }
    pageContext->AppendObjectList(pPage, &matrix);

    pContext->m_pRenderer = FX_NEW CPDF_ProgressiveRenderer;
    pContext->m_pRenderer->Start(pageContext, fxgeDevice, renderOptions, NULL);

    fxgeDevice->RestoreState();

    pPage->RemovePrivateData((void*) 1);

    delete pContext;
}