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ImFont::GetTextureData API allow to retrieve 8/32 bits data + lazily load defaults font

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Examples: OpenGL3 and DirectX11 back to using 32-bits texture solely for
ease of integration.
This commit is contained in:
ocornut
2015-01-11 21:06:57 +00:00
parent 241e8086fa
commit 0f4d74d614
6 changed files with 125 additions and 88 deletions
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60
imgui.cpp
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@ -6208,7 +6208,8 @@ ImFont::ImFont()
DisplayOffset = ImVec2(0.5f, 0.5f);
FallbackChar = (ImWchar)'?';
TexPixels = NULL;
TexPixelsAlpha8 = NULL;
TexPixelsRGBA32 = NULL;
Clear();
}
@ -6217,15 +6218,55 @@ ImFont::~ImFont()
Clear();
}
void ImFont::GetTextureDataAlpha8(unsigned char** out_pixels, int* out_width, int* out_height, int* out_bytes_per_pixel)
{
// Lazily load default font
if (!IsLoaded())
LoadDefault();
*out_pixels = TexPixelsAlpha8;
if (out_width) *out_width = TexWidth;
if (out_height) *out_height = TexHeight;
if (out_bytes_per_pixel) *out_bytes_per_pixel = 1;
}
void ImFont::GetTextureDataRGBA32(unsigned char** out_pixels, int* out_width, int* out_height, int* out_bytes_per_pixel)
{
// Lazily convert to RGBA32 format
// Although it is likely to be the most commonly used format, our font rendering is 8 bpp
if (!TexPixelsRGBA32)
{
unsigned char* pixels;
GetTextureDataAlpha8(&pixels, NULL, NULL);
TexPixelsRGBA32 = (unsigned int*)ImGui::MemAlloc(TexWidth * TexHeight * 4);
const unsigned char* src = pixels;
unsigned int* dst = TexPixelsRGBA32;
for (int n = TexWidth * TexHeight; n > 0; n--)
*dst++ = ((*src++) << 24) | 0x00FFFFFF;
}
*out_pixels = (unsigned char*)TexPixelsRGBA32;
if (out_width) *out_width = TexWidth;
if (out_height) *out_height = TexHeight;
if (out_bytes_per_pixel) *out_bytes_per_pixel = 4;
}
void ImFont::ClearTextureData()
{
if (TexPixelsAlpha8)
ImGui::MemFree(TexPixelsAlpha8);
if (TexPixelsRGBA32)
ImGui::MemFree(TexPixelsRGBA32);
TexPixelsAlpha8 = NULL;
TexPixelsRGBA32 = NULL;
}
void ImFont::Clear()
{
if (TexPixels)
ImGui::MemFree(TexPixels);
DisplayOffset = ImVec2(0.5f, 0.5f);
ClearTextureData();
TexID = NULL;
TexPixels = NULL;
TexWidth = TexHeight = 0;
TexExtraDataPos = TexUvWhitePixel = ImVec2(0, 0);
@ -6392,7 +6433,6 @@ bool ImFont::LoadFromMemoryTTF(const void* data, size_t data_size, float size
{
TexWidth = 512;
TexHeight = 0;
TexPixels = NULL;
const int max_tex_height = 1024*16;
stbtt_pack_context spc;
int ret = stbtt_PackBegin(&spc, NULL, TexWidth, max_tex_height, 0, 1, NULL);
@ -6423,11 +6463,11 @@ bool ImFont::LoadFromMemoryTTF(const void* data, size_t data_size, float size
if (rects[i].was_packed)
tex_h = ImMax(tex_h, rects[i].y + rects[i].h);
TexHeight = ImUpperPowerOfTwo(tex_h);
TexPixels = (unsigned char*)ImGui::MemRealloc(TexPixels, TexWidth * TexHeight);
memset(TexPixels, 0, TexWidth * TexHeight);
TexPixelsAlpha8 = (unsigned char*)ImGui::MemRealloc(TexPixelsAlpha8, TexWidth * TexHeight);
memset(TexPixelsAlpha8, 0, TexWidth * TexHeight);
// Render characters
spc.pixels = TexPixels;
spc.pixels = TexPixelsAlpha8;
spc.height = TexHeight;
ret = stbtt_PackFontRangesRenderIntoRects(&spc, &ttf_info, ranges.begin(), ranges.size(), rects);
stbtt_PackEnd(&spc);
@ -6476,7 +6516,7 @@ bool ImFont::LoadFromMemoryTTF(const void* data, size_t data_size, float size
ImGui::MemFree(ranges[i].chardata_for_range);
// Draw white pixel and make UV points to it
TexPixels[0] = TexPixels[1] = TexPixels[TexWidth+0] = TexPixels[TexWidth+1] = 0xFF;
TexPixelsAlpha8[0] = TexPixelsAlpha8[1] = TexPixelsAlpha8[TexWidth+0] = TexPixelsAlpha8[TexWidth+1] = 0xFF;
TexUvWhitePixel = ImVec2((TexExtraDataPos.x + 0.5f) / TexWidth, (TexExtraDataPos.y + 0.5f) / TexHeight);
return true;