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Created page with 'We are proposing a NPAPI extension which would allow a plugin to render directly into 32-bit buffer in shared memory. The new extension will be designed so that plugin explicitly…'
We are proposing a NPAPI extension which would allow a plugin to
render directly into 32-bit buffer in shared memory. The new extension
will be designed so that plugin explicitly makes requests of the user
agent whether the extension is supported (with NPN_GetValue and
NPNVSupportsWindowlessLocal) and then enables the new rendering mode
at runtime (with NPN_SetValue and NPPVpluginWindowlessLocalBool). In
this way other plugins unaware of new extension will not be disrupted.
When new rendering mode is enabled the Xdrawable field of a standard
XGraphicsExpose event holds a pointer to the new NPImageExpose
structure which among other things contains pointer to the shared
memory buffer, its dimensions, translation and scale factors.
typedef struct _NPImageExpose
{
char* data; /* image pointer */
int32 stride; /* Stride of data image buffer */
int32 depth; /* Depth of image pointer */
int32 x; /* Expose x */
int32 y; /* Expose y */
uint32 width; /* Expose width */
uint32 height; /* Expose height */
NPSize dataSize; /* Data buffer size */
float translateX; /* translate X matrix value */
float translateY; /* translate Y matrix value */
float scaleX; /* scale X matrix value */
float scaleY; /* scale Y matrix value */
} NPImageExpose;
see discussion:
http://groups.google.com/group/mozilla.dev.tech.plugins/browse_thread/thread/14a7aa48294faa68/fccbdd2fa6377b98#fccbdd2fa6377b98
render directly into 32-bit buffer in shared memory. The new extension
will be designed so that plugin explicitly makes requests of the user
agent whether the extension is supported (with NPN_GetValue and
NPNVSupportsWindowlessLocal) and then enables the new rendering mode
at runtime (with NPN_SetValue and NPPVpluginWindowlessLocalBool). In
this way other plugins unaware of new extension will not be disrupted.
When new rendering mode is enabled the Xdrawable field of a standard
XGraphicsExpose event holds a pointer to the new NPImageExpose
structure which among other things contains pointer to the shared
memory buffer, its dimensions, translation and scale factors.
typedef struct _NPImageExpose
{
char* data; /* image pointer */
int32 stride; /* Stride of data image buffer */
int32 depth; /* Depth of image pointer */
int32 x; /* Expose x */
int32 y; /* Expose y */
uint32 width; /* Expose width */
uint32 height; /* Expose height */
NPSize dataSize; /* Data buffer size */
float translateX; /* translate X matrix value */
float translateY; /* translate Y matrix value */
float scaleX; /* scale X matrix value */
float scaleY; /* scale Y matrix value */
} NPImageExpose;
see discussion:
http://groups.google.com/group/mozilla.dev.tech.plugins/browse_thread/thread/14a7aa48294faa68/fccbdd2fa6377b98#fccbdd2fa6377b98
