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APNG Specification: Difference between revisions
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+---------------------- bit 4: APNG_RENDER_OP_SKIP_FRAME | +---------------------- bit 4: APNG_RENDER_OP_SKIP_FRAME | ||
Bits 5 through 7 are reserved and must be 0. | Bits 5 through 7 are reserved and must be 0. | ||
value | Valid values for `dispose_op` are: | ||
value bit | |||
1 0 APNG_RENDER_OP_DISPOSE_NONE | |||
2 1 APNG_RENDER_OP_DISPOSE_BACKGROUND | |||
4 2 APNG_RENDER_OP_DISPOSE_PREVIOUS | |||
* `APNG_RENDER_OP_DISPOSE_NONE`: no disposal is done on this frame before rendering the next; its contents are left on the canvas. This is the default. | * `APNG_RENDER_OP_DISPOSE_NONE`: no disposal is done on this frame before rendering the next; its contents are left on the canvas. This is the default. | ||
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byte | byte | ||
0 | 0 sequence_number (unsigned int) Sequence number of the animation chunk, starting from 0 | ||
4 | 4 frame_data X bytes Frame data for this frame | ||
Each frame inherits every property except the width and the height specified by any critical or ancillary chunks before the first IDAT in the file. | Each frame inherits every property except the width and the height specified by any critical or ancillary chunks before the first IDAT in the file. | ||