add android_flex_layout for describing all flexible formats.
Bug: 22767098
Bug: 24759202
Change-Id: I61e4ca9bd71e8da88a9571ec4effc7165026715b
diff --git a/include/system/graphics.h b/include/system/graphics.h
index a9e451f..1ac1a00 100644
--- a/include/system/graphics.h
+++ b/include/system/graphics.h
@@ -477,6 +477,102 @@
uint32_t reserved[8];
};
+/*
+ * Structures for describing flexible YUVA/RGBA formats for consumption by
+ * applications. Such flexible formats contain a plane for each component (e.g.
+ * red, green, blue), where each plane is laid out in a grid-like pattern
+ * occupying unique byte addresses and with consistent byte offsets between
+ * neighboring pixels.
+ *
+ * The android_flex_layout structure is used with any pixel format that can be
+ * represented by it, such as:
+ * - HAL_PIXEL_FORMAT_YCbCr_*_888
+ * - HAL_PIXEL_FORMAT_FLEX_RGB*_888
+ * - HAL_PIXEL_FORMAT_RGB[AX]_888[8],BGRA_8888,RGB_888
+ * - HAL_PIXEL_FORMAT_YV12,Y8,Y16,YCbCr_422_SP/I,YCrCb_420_SP
+ * - even implementation defined formats that can be represented by
+ * the structures
+ *
+ * Vertical increment (aka. row increment or stride) describes the distance in
+ * bytes from the first pixel of one row to the first pixel of the next row
+ * (below) for the component plane. This can be negative.
+ *
+ * Horizontal increment (aka. column or pixel increment) describes the distance
+ * in bytes from one pixel to the next pixel (to the right) on the same row for
+ * the component plane. This can be negative.
+ *
+ * Each plane can be subsampled either vertically or horizontally by
+ * a power-of-two factor.
+ *
+ * The bit-depth of each component can be arbitrary, as long as the pixels are
+ * laid out on whole bytes, in native byte-order, using the most significant
+ * bits of each unit.
+ */
+
+typedef enum android_flex_component {
+ /* luma */
+ FLEX_COMPONENT_Y = 1 << 0,
+ /* chroma blue */
+ FLEX_COMPONENT_Cb = 1 << 1,
+ /* chroma red */
+ FLEX_COMPONENT_Cr = 1 << 2,
+
+ /* red */
+ FLEX_COMPONENT_R = 1 << 10,
+ /* green */
+ FLEX_COMPONENT_G = 1 << 11,
+ /* blue */
+ FLEX_COMPONENT_B = 1 << 12,
+
+ /* alpha */
+ FLEX_COMPONENT_A = 1 << 30,
+} android_flex_component_t;
+
+typedef struct android_flex_plane {
+ /* pointer to the first byte of the top-left pixel of the plane. */
+ uint8_t *top_left;
+
+ android_flex_component_t component;
+
+ /* bits allocated for the component in each pixel. Must be a positive
+ multiple of 8. */
+ int32_t bits_per_component;
+ /* number of the most significant bits used in the format for this
+ component. Must be between 1 and bits_per_component, inclusive. */
+ int32_t bits_used;
+
+ /* horizontal increment */
+ int32_t h_increment;
+ /* vertical increment */
+ int32_t v_increment;
+ /* horizontal subsampling. Must be a positive power of 2. */
+ int32_t h_subsampling;
+ /* vertical subsampling. Must be a positive power of 2. */
+ int32_t v_subsampling;
+} android_flex_plane_t;
+
+typedef enum android_flex_format {
+ /* not a flexible format */
+ FLEX_FORMAT_INVALID = 0x0,
+ FLEX_FORMAT_Y = FLEX_COMPONENT_Y,
+ FLEX_FORMAT_YCbCr = FLEX_COMPONENT_Y | FLEX_COMPONENT_Cb | FLEX_COMPONENT_Cr,
+ FLEX_FORMAT_YCbCrA = FLEX_FORMAT_YCbCr | FLEX_COMPONENT_A,
+ FLEX_FORMAT_RGB = FLEX_COMPONENT_R | FLEX_COMPONENT_G | FLEX_COMPONENT_B,
+ FLEX_FORMAT_RGBA = FLEX_FORMAT_RGB | FLEX_COMPONENT_A,
+} android_flex_format_t;
+
+typedef struct android_flex_layout {
+ /* the kind of flexible format */
+ android_flex_format_t format;
+
+ /* number of planes; 0 for FLEX_FORMAT_INVALID */
+ uint32_t num_planes;
+ /* a plane for each component; ordered in increasing component value order.
+ E.g. FLEX_FORMAT_RGBA maps 0 -> R, 1 -> G, etc.
+ Can be NULL for FLEX_FORMAT_INVALID */
+ android_flex_plane_t *planes;
+} android_flex_layout_t;
+
/**
* Structure used to define depth point clouds for format HAL_PIXEL_FORMAT_BLOB
* with dataSpace value of HAL_DATASPACE_DEPTH.
