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| author | Henrique Nakashima <hnakashima@chromium.org> | 2018-01-11 21:30:48 +0000 |
|---|---|---|
| committer | Chromium commit bot <commit-bot@chromium.org> | 2018-01-11 21:30:48 +0000 |
| commit | 923948632fe798d1c17000803d9d4b1559b4ffa1 (patch) | |
| tree | 12a049a6bf2883103643fce82867b12da019ca74 | |
| parent | 11bd9dd6b967223761ed892ab6820bd6ce44b3c6 (diff) | |
| download | pdfium-923948632fe798d1c17000803d9d4b1559b4ffa1.tar.xz | |
Improve documentation of FPDF_RenderPageBitmapWithMatrix.
Change-Id: I5cb28dfd6b1e5670fc20093c5d2f9757ad6a4060
Reviewed-on: https://pdfium-review.googlesource.com/22830
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
| -rw-r--r-- | public/fpdfview.h | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/public/fpdfview.h b/public/fpdfview.h index 1cd3d6d194..697801231f 100644 --- a/public/fpdfview.h +++ b/public/fpdfview.h @@ -112,7 +112,14 @@ typedef struct _FPDF_BSTR { // system wide string by yourself. typedef const char* FPDF_STRING; -// Matrix for transformation. +// Matrix for transformation, in the form [a b c d e f], equivalent to: +// | a b 0 | +// | c d 0 | +// | e f 1 | +// +// Translation is performed with [1 0 0 1 tx ty]. +// Scaling is performed with [sx 0 0 sy 0 0]. +// See PDF Reference 1.7, 4.2.2 Common Transformations for more. typedef struct _FS_MATRIX_ { float a; float b; @@ -667,9 +674,10 @@ FPDF_EXPORT void FPDF_CALLCONV FPDF_RenderPageBitmap(FPDF_BITMAP bitmap, // output buffer). The bitmap handle can be created // by FPDFBitmap_Create or retrieved by // FPDFImageObj_GetBitmap. -// page - Handle to the page. Returned by FPDF_LoadPage -// matrix - The transform matrix. It must be invertible. -// clipping - The rect to clip to. +// page - Handle to the page. Returned by FPDF_LoadPage. +// matrix - The transform matrix, which must be invertible. +// See PDF Reference 1.7, 4.2.2 Common Transformations. +// clipping - The rect to clip to in page coords. // flags - 0 for normal display, or combination of the Page // Rendering flags defined above. With the FPDF_ANNOT // flag, it renders all annotations that do not require |