mods to remove BufferFormat
Change-Id: I21b837d5f142544ebf8e3b9f0ddf8253d2a2529f
diff --git a/system/ulib/sysmem/sysmem.cpp b/system/ulib/sysmem/sysmem.cpp
index f13d2ae..781eb74 100644
--- a/system/ulib/sysmem/sysmem.cpp
+++ b/system/ulib/sysmem/sysmem.cpp
@@ -13,6 +13,41 @@
#include <zircon/assert.h>
#include <zircon/syscalls.h>
+
+zx_status_t PickImageFormat(const fuchsia_sysmem_BufferSpec &spec,
+ fuchsia_sysmem_ImageFormat *format,
+ size_t *buffer_size) {
+
+ // For the simple case, just use whatever format was given.
+ *format_out = {
+ .width = spec.image.min_width;
+ .height = spec.image.min_height;
+ .layers = spec.image.layers;
+ .pixel_format = spec.image.pixel_format;
+ .color_space = spec.image.color_space;
+ }
+ // Need to choose bytes_per_row, which depends on pixel_format:
+ // (More generally, it also depends on color space and BufferUsage,
+ // but this is a simplified version.)
+ switch (spec.image.pixel_format) {
+ case fuchsia_sysmem_PixelFormatType_R8G8B8A8:
+ case fuchsia_sysmem_PixelFormatType_BGRA32:
+ format->layers[0].bytes_per_row = 4 * format->width;
+ *buffer_size = fbl::round_up(format->image.height * format->image.planes[0].bytes_per_row, ZX_PAGE_SIZE);
+ break;
+ case fuchsia_sysmem_PixelFormatType_I420: // An NxN Y plane and (N/2)x(N/2) U and V planes.
+ format->layers[0].bytes_per_row = format->width;
+ format->layers[1].bytes_per_row = format->width / 2;
+ format->layers[1].byte_offset = format->layers[0].bytes_per_row * format->height;
+ format->layers[2].bytes_per_row = format->width / 2;
+ format->layers[2].byte_offset = format->layers[1].byte_offset + format->layers[1].bytes_per_row * format->height / 2;
+ *buffer_size = fbl::round_up(ormat->layers[2].byte_offset + format->layers[2].bytes_per_row * format->height / 2, ZX_PAGE_SIZE);
+ break;
+
+}
+
+
+
// This should be called with a fully specified BufferFormat, after the allocator has
// decided what format to use:
size_t GetBufferSize(const fuchsia_sysmem_BufferFormat& format) {
