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  1. /*
  2.  * This file is part of LibCSS
  3.  * Licensed under the MIT License,
  4.  *                http://www.opensource.org/licenses/mit-license.php
  5.  * Copyright 2011 John-Mark Bell <jmb@netsurf-browser.org>
  6.  */
  7.  
  8. #include "bytecode/bytecode.h"
  9. #include "bytecode/opcodes.h"
  10. #include "select/propset.h"
  11. #include "select/propget.h"
  12. #include "utils/utils.h"
  13.  
  14. #include "select/properties/properties.h"
  15. #include "select/properties/helpers.h"
  16.  
  17. css_error css__cascade_opacity(uint32_t opv, css_style *style,
  18.                 css_select_state *state)
  19. {
  20.         uint16_t value = CSS_OPACITY_INHERIT;
  21.         css_fixed opacity = 0;
  22.  
  23.         if (isInherit(opv) == false) {
  24.                 value = CSS_Z_INDEX_SET;
  25.  
  26.                 opacity = *((css_fixed *) style->bytecode);
  27.                 advance_bytecode(style, sizeof(opacity));
  28.         }
  29.  
  30.         if (css__outranks_existing(getOpcode(opv), isImportant(opv), state,
  31.                         isInherit(opv))) {
  32.                 return set_opacity(state->computed, value, opacity);
  33.         }
  34.  
  35.         return CSS_OK;
  36. }
  37.  
  38. css_error css__set_opacity_from_hint(const css_hint *hint,
  39.                 css_computed_style *style)
  40. {
  41.         return set_opacity(style, hint->status, hint->data.fixed);
  42. }
  43.  
  44. css_error css__initial_opacity(css_select_state *state)
  45. {
  46.         return set_opacity(state->computed, CSS_OPACITY_SET, INTTOFIX(1));
  47. }
  48.  
  49. css_error css__compose_opacity(const css_computed_style *parent,
  50.                 const css_computed_style *child,
  51.                 css_computed_style *result)
  52. {
  53.         css_fixed opacity = 0;
  54.         uint8_t type = get_opacity(child, &opacity);
  55.  
  56.         if (type == CSS_OPACITY_INHERIT) {
  57.                 type = get_opacity(parent, &opacity);
  58.         }
  59.  
  60.         return set_opacity(result, type, opacity);
  61. }
  62.  
  63.