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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/viz/common/resources/resource_format_utils.h"
#include "base/logging.h"
#include "base/macros.h"
#include "third_party/khronos/GLES2/gl2.h"
#include "third_party/khronos/GLES2/gl2ext.h"
#include "ui/gfx/buffer_types.h"
namespace viz {
SkColorType ResourceFormatToClosestSkColorType(ResourceFormat format) {
// Use kN32_SkColorType if there is no corresponding SkColorType.
switch (format) {
case RGBA_4444:
return kARGB_4444_SkColorType;
case RGBA_8888:
return kRGBA_8888_SkColorType;
case BGRA_8888:
return kBGRA_8888_SkColorType;
case ALPHA_8:
return kAlpha_8_SkColorType;
case RGB_565:
return kRGB_565_SkColorType;
case LUMINANCE_8:
return kGray_8_SkColorType;
case ETC1:
case RED_8:
case LUMINANCE_F16:
case R16_EXT:
return kN32_SkColorType;
case RGBA_F16:
return kRGBA_F16_SkColorType;
}
NOTREACHED();
return kN32_SkColorType;
}
int BitsPerPixel(ResourceFormat format) {
switch (format) {
case RGBA_F16:
return 64;
case BGRA_8888:
case RGBA_8888:
return 32;
case RGBA_4444:
case RGB_565:
case LUMINANCE_F16:
case R16_EXT:
return 16;
case ALPHA_8:
case LUMINANCE_8:
case RED_8:
return 8;
case ETC1:
return 4;
}
NOTREACHED();
return 0;
}
unsigned int GLDataType(ResourceFormat format) {
DCHECK_LE(format, RESOURCE_FORMAT_MAX);
static const GLenum format_gl_data_type[] = {
GL_UNSIGNED_BYTE, // RGBA_8888
GL_UNSIGNED_SHORT_4_4_4_4, // RGBA_4444
GL_UNSIGNED_BYTE, // BGRA_8888
GL_UNSIGNED_BYTE, // ALPHA_8
GL_UNSIGNED_BYTE, // LUMINANCE_8
GL_UNSIGNED_SHORT_5_6_5, // RGB_565,
GL_UNSIGNED_BYTE, // ETC1
GL_UNSIGNED_BYTE, // RED_8
GL_HALF_FLOAT_OES, // LUMINANCE_F16
GL_HALF_FLOAT_OES, // RGBA_F16
GL_UNSIGNED_SHORT, // R16_EXT
};
static_assert(arraysize(format_gl_data_type) == (RESOURCE_FORMAT_MAX + 1),
"format_gl_data_type does not handle all cases.");
return format_gl_data_type[format];
}
unsigned int GLDataFormat(ResourceFormat format) {
DCHECK_LE(format, RESOURCE_FORMAT_MAX);
static const GLenum format_gl_data_format[] = {
GL_RGBA, // RGBA_8888
GL_RGBA, // RGBA_4444
GL_BGRA_EXT, // BGRA_8888
GL_ALPHA, // ALPHA_8
GL_LUMINANCE, // LUMINANCE_8
GL_RGB, // RGB_565
GL_ETC1_RGB8_OES, // ETC1
GL_RED_EXT, // RED_8
GL_LUMINANCE, // LUMINANCE_F16
GL_RGBA, // RGBA_F16
GL_RED_EXT, // R16_EXT
};
static_assert(arraysize(format_gl_data_format) == (RESOURCE_FORMAT_MAX + 1),
"format_gl_data_format does not handle all cases.");
return format_gl_data_format[format];
}
unsigned int GLInternalFormat(ResourceFormat format) {
// In GLES2, the internal format must match the texture format. (It no longer
// is true in GLES3, however it still holds for the BGRA extension.)
// GL_EXT_texture_norm16 follows GLES3 semantics and only exposes a sized
// internal format (GL_R16_EXT).
if (format == R16_EXT)
return GL_R16_EXT;
return GLDataFormat(format);
}
unsigned int GLCopyTextureInternalFormat(ResourceFormat format) {
// In GLES2, valid formats for glCopyTexImage2D are: GL_ALPHA, GL_LUMINANCE,
// GL_LUMINANCE_ALPHA, GL_RGB, or GL_RGBA.
// Extensions typically used for glTexImage2D do not also work for
// glCopyTexImage2D. For instance GL_BGRA_EXT may not be used for
// anything but gl(Sub)TexImage2D:
// https://www.khronos.org/registry/gles/extensions/EXT/EXT_texture_format_BGRA8888.txt
DCHECK_LE(format, RESOURCE_FORMAT_MAX);
static const GLenum format_gl_data_format[] = {
GL_RGBA, // RGBA_8888
GL_RGBA, // RGBA_4444
GL_RGBA, // BGRA_8888
GL_ALPHA, // ALPHA_8
GL_LUMINANCE, // LUMINANCE_8
GL_RGB, // RGB_565
GL_RGB, // ETC1
GL_LUMINANCE, // RED_8
GL_LUMINANCE, // LUMINANCE_F16
GL_RGBA, // RGBA_F16
GL_LUMINANCE, // R16_EXT
};
static_assert(arraysize(format_gl_data_format) == (RESOURCE_FORMAT_MAX + 1),
"format_gl_data_format does not handle all cases.");
return format_gl_data_format[format];
}
gfx::BufferFormat BufferFormat(ResourceFormat format) {
switch (format) {
case BGRA_8888:
return gfx::BufferFormat::BGRA_8888;
case RED_8:
return gfx::BufferFormat::R_8;
case R16_EXT:
return gfx::BufferFormat::R_16;
case RGBA_4444:
return gfx::BufferFormat::RGBA_4444;
case RGBA_8888:
return gfx::BufferFormat::RGBA_8888;
case ETC1:
return gfx::BufferFormat::ETC1;
case RGBA_F16:
return gfx::BufferFormat::RGBA_F16;
case ALPHA_8:
case LUMINANCE_8:
case RGB_565:
case LUMINANCE_F16:
// These types not allowed by IsGpuMemoryBufferFormatSupported(), so
// give a default value that will not be used.
break;
}
return gfx::BufferFormat::RGBA_8888;
}
bool IsResourceFormatCompressed(ResourceFormat format) {
return format == ETC1;
}
bool DoesResourceFormatSupportAlpha(ResourceFormat format) {
switch (format) {
case RGBA_4444:
case RGBA_8888:
case BGRA_8888:
case ALPHA_8:
case RGBA_F16:
return true;
case LUMINANCE_8:
case RGB_565:
case ETC1:
case RED_8:
case LUMINANCE_F16:
case R16_EXT:
return false;
}
NOTREACHED();
return false;
}
unsigned int TextureStorageFormat(ResourceFormat format) {
switch (format) {
case RGBA_8888:
return GL_RGBA8_OES;
case BGRA_8888:
return GL_BGRA8_EXT;
case RGBA_F16:
return GL_RGBA16F_EXT;
case RGBA_4444:
return GL_RGBA4;
case ALPHA_8:
return GL_ALPHA8_EXT;
case LUMINANCE_8:
return GL_LUMINANCE8_EXT;
case RGB_565:
return GL_RGB565;
case RED_8:
return GL_R8_EXT;
case LUMINANCE_F16:
return GL_LUMINANCE16F_EXT;
case R16_EXT:
return GL_R16_EXT;
case ETC1:
break;
}
NOTREACHED();
return GL_RGBA8_OES;
}
bool IsGpuMemoryBufferFormatSupported(ResourceFormat format) {
switch (format) {
case BGRA_8888:
case RED_8:
case R16_EXT:
case RGBA_4444:
case RGBA_8888:
case ETC1:
case RGBA_F16:
return true;
// These formats have no BufferFormat equivalent.
case ALPHA_8:
case LUMINANCE_8:
case RGB_565:
case LUMINANCE_F16:
return false;
}
NOTREACHED();
return false;
}
bool IsBitmapFormatSupported(ResourceFormat format) {
switch (format) {
case RGBA_8888:
return true;
case RGBA_4444:
case BGRA_8888:
case ALPHA_8:
case LUMINANCE_8:
case RGB_565:
case ETC1:
case RED_8:
case LUMINANCE_F16:
case RGBA_F16:
case R16_EXT:
return false;
}
NOTREACHED();
return false;
}
} // namespace viz
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