Lines Matching full:alpha
83 >SDL_SetAlpha -- Adjust the alpha properties of a surface</DIV
109 >(SDL_Surface *surface, Uint32 flag, Uint8 alpha);</CODE
129 >This function and the semantics of SDL alpha blending have changed since version 1.1.4. Up until version 1.1.5, an alpha value of 0 was considered opaque and a value of 255 was considered transparent. This has now been inverted: 0 (<TT
142 > is used for setting the per-surface alpha
143 value and/or enabling and disabling alpha blending.</P
150 > parameter specifies which surface whose alpha
157 whether alpha blending should be used (<TT
175 > is not passed as a flag then all alpha
180 >alpha</I
182 > parameter is the per-surface alpha value; a
183 surface need not have an alpha channel to use per-surface alpha and blitting
195 >The per-surface alpha value of 128 is considered a special case and
200 >Alpha effects surface blitting in the following ways:</P
224 >The source is alpha-blended with the destination, using the alpha channel. <TT
227 > and the per-surface alpha are ignored.</P
242 >The RGB data is copied from the source. The source alpha channel and the per-surface alpha value are ignored.</P
257 >The source is alpha-blended with the destination using the per-surface alpha
262 matching the colorkey value are copied. The alpha channel of the copied pixels
278 >The RGB data is copied from the source and the alpha value of the copied pixels
298 >The source is alpha-blended with the destination using the source alpha
299 channel. The alpha channel in the destination surface is left untouched.
336 >The source is alpha-blended with the destination using the per-surface alpha value. If <TT
372 > Note that RGBA->RGBA blits (with SDL_SRCALPHA set) keep the alpha
375 them; the destination alpha will work as a mask.</P
377 >Also note that per-pixel and per-surface alpha cannot be combined;
378 the per-pixel alpha is always used if available</P
