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93 lines
2.9 KiB
C++
93 lines
2.9 KiB
C++
// Copyright 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "flow/texture_image.h"
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#include "flow/open_gl.h"
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namespace flow {
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inline GLint ToGLFormat(TextureImageFormat format) {
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switch (format) {
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case TextureImageFormat::RGBA:
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return GL_RGBA;
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case TextureImageFormat::RGB:
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return GL_RGB;
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case TextureImageFormat::Grey:
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return GL_LUMINANCE;
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case TextureImageFormat::GreyAlpha:
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return GL_LUMINANCE_ALPHA;
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}
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return GL_NONE;
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}
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inline GLint ToGLDataFormat(TextureImageDataFormat dataFormat) {
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switch (dataFormat) {
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case TextureImageDataFormat::UnsignedByte:
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return GL_UNSIGNED_BYTE;
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case TextureImageDataFormat::UnsignedShort565:
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return GL_UNSIGNED_SHORT_5_6_5;
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}
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return GL_NONE;
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}
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sk_sp<SkImage> TextureImageCreate(GrContext* context,
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TextureImageFormat format,
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const SkISize& size,
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TextureImageDataFormat dataFormat,
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const uint8_t* data) {
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GLuint handle = GL_NONE;
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// Generate the texture handle.
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glGenTextures(1, &handle);
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// Bind the texture.
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glBindTexture(GL_TEXTURE_2D, handle);
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// Specify default texture properties.
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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// Update unpack alignment based on format.
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glPixelStorei(GL_UNPACK_ALIGNMENT,
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dataFormat == TextureImageDataFormat::UnsignedByte ? 4 : 2);
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GLint gl_format = ToGLFormat(format);
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// Upload the texture.
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glTexImage2D(GL_TEXTURE_2D, // target
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0, // level
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gl_format, // internal format
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size.fWidth, // width
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size.fHeight, // height
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0, // border
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gl_format, // format
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ToGLDataFormat(dataFormat), // format
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data);
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// Clear the binding. We are done.
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glBindTexture(GL_TEXTURE_2D, GL_NONE);
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// Create an SkImage handle from the texture.
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GrBackendTextureDesc desc;
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desc.fWidth = size.fWidth;
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desc.fHeight = size.fHeight;
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desc.fTextureHandle = handle;
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if (auto image = SkImage::MakeFromAdoptedTexture(context, desc)) {
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// Texture handle was successfully adopted by the SkImage.
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return image;
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}
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// We could not create an SkImage from the texture. Since it could not be
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// adopted, delete the handle and return null.
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glDeleteTextures(1, &handle);
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return nullptr;
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}
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} // namespace flow
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