THotPDF.RenderLoadedPageToBitmap

THotPDF

Vykreslí načítanú stránku do 24-bitovej bitmapy RGB GDI v zadanom rozlíšení DPI. Volajúci je zodpovedný za uvoľnenie bitmapy. Vráti nil v prípade zlyhania.

Bitmapa pokrýva viditeľnú časť strany, jej /CropBox orezaný na /MediaBox (viď GetLoadedPageVisibleBox); obsah mimo nej sa nekreslí

Syntax Delphi:

function RenderLoadedPageToBitmap(PageIndex, DPI: Integer): TBitmap;

Popis

Vykreslí načítanú stránku do 24-bitovej bitmapy RGB GDI v zadanom rozlíšení DPI. Volajúci je zodpovedný za uvoľnenie bitmapy. Vráti nil v prípade zlyhania.scn and SCN preserve coloured pattern names or uncoloured base tints, and pattern paint is clipped to the active fill or widened stroke path

Tiling pattern streams are tokenised once per paint and reused across visible cells. Pattern matrices, cell bounding boxes, nested resources, graphics-state isolation, and colour suppression for uncoloured cells are honoured. Rendering rejects zero or near-zero steps, more than 16,384 cells per paint, and pattern nesting deeper than four levels

Type 2 axial and Type 3 radial shadings evaluate their function objects through the declared colour space, honour the shading domain and extension flags, and work for bitmap and direct device-context rendering. Radial shadings use batched Gouraud triangles with transformed circle chord error bounded to 0.35 device pixels and adaptive colour subdivision bounded to two RGB levels, with a 262,144-triangle ceiling. The caller owns and must free a non-nil bitmap result